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Enable line-only debuginfo by default. #54459

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eddyb
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@eddyb eddyb commented Sep 22, 2018

Previously, only official builds (stable/beta/nightly) had debuginfo-lines enabled, but it was in conjunction with debuginfo-only-std, meaning that the compiler had no debuginfo.

In my experience, when you have a panic/crash in rustc, line debuginfo is necessary to get a readable backtrace, and we would've saved ourselves some pain and time, had we done this earlier.

At least we can try to explore and discuss the tradeoffs involved here.

r? @alexcrichton cc @rust-lang/infra @rust-lang/compiler

@RalfJung
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Related issue: #52179

@Mark-Simulacrum
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@bors try for comparison artifacts

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bors commented Sep 22, 2018

⌛ Trying commit 6c4d7a31fdcf0a1488b003fd5fa4d3815c77efab with merge 5fd88ccbf4d20c70960c1b0e76fe82325e23a35e...

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bors commented Sep 22, 2018

☀️ Test successful - status-travis
State: approved= try=True

@alexcrichton
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The debuginfo-only-std option was added in #38984 due to #37477 (backtraces super slow so RUST_BACKTRACE=1 made compiler errors take forever to get emitted). That performance bug in libbacktrace was later mitigated in #45523 which lives in today's libbacktrace submodule in rust-lang/libbacktrace@bddb51c. The underlying bug appears to also have been actually fixed in ianlancetaylor/libbacktrace@b0d6903, which is also contained in our submodule.

I recall that when preparing #45523 I found that backtraces, while much faster with malloc/free, were still noticeably slow with malloc/free. To that end I tested this out:

$ touch foo.rs
$ export RUST_BACKTRACE=1
$ time rustc +nightly foo.rs
error[E0601]: `main` function not found in crate `foo`                           
  |                                                                              
  = note: consider adding a `main` function to `foo.rs`                          
                                                                                 
error: aborting due to previous error                                            
                                                                                 
For more information about this error, try `rustc --explain E0601`.              
rustc +nightly foo.rs  0.05s user 0.02s system 79% cpu 0.088 total               
$ time rustc +5fd88ccbf4d20c70960c1b0e76fe82325e23a35e foo.rs 
error[E0601]: `main` function not found in crate `foo`                                             
  |                                                                                                
  = note: consider adding a `main` function to `foo.rs`                                            
                                                                                                   
error: aborting due to previous error                                                              
                                                                                                   
For more information about this error, try `rustc --explain E0601`.                                
rustc +5fd88ccbf4d20c70960c1b0e76fe82325e23a35e foo.rs  0.05s user 0.03s system 81% cpu 0.088 total

Ok great! Looks like there's no slowdown here at all. Testing out a random test case with an ICE we can also see:

Current Nightly

$ rustc +nightly foo.rs
error: internal compiler error: Error constructed but not emitted

thread 'main' panicked at 'explicit panic', librustc_errors/diagnostic_builder.rs:340:13
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::print
             at libstd/sys_common/backtrace.rs:71
             at libstd/sys_common/backtrace.rs:59
   2: std::panicking::default_hook::{{closure}}
             at libstd/panicking.rs:211
   3: std::panicking::default_hook
             at libstd/panicking.rs:227
   4: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:477
   5: std::panicking::begin_panic
   6: <rustc_errors::diagnostic_builder::DiagnosticBuilder<'a> as core::ops::drop::Drop>::drop
   7: syntax::parse::parser::Parser::parse_pat_fields
   8: syntax::parse::parser::Parser::parse_pat_with_range_pat
   9: syntax::parse::parser::Parser::parse_top_level_pat
  10: syntax::parse::parser::Parser::parse_pats
  11: syntax::parse::parser::Parser::parse_arm
  12: syntax::parse::parser::Parser::parse_bottom_expr
  13: syntax::parse::parser::Parser::parse_dot_or_call_expr
  14: syntax::parse::parser::Parser::parse_prefix_expr
  15: syntax::parse::parser::Parser::parse_assoc_expr_with
  16: syntax::parse::parser::Parser::parse_stmt_without_recovery
  17: syntax::parse::parser::Parser::parse_full_stmt
  18: syntax::parse::parser::Parser::parse_block_tail
  19: syntax::parse::parser::Parser::parse_inner_attrs_and_block
  20: syntax::parse::parser::Parser::parse_for_expr
  21: syntax::parse::parser::Parser::parse_bottom_expr
  22: syntax::parse::parser::Parser::parse_dot_or_call_expr
  23: syntax::parse::parser::Parser::parse_prefix_expr
  24: syntax::parse::parser::Parser::parse_assoc_expr_with
  25: syntax::parse::parser::Parser::parse_stmt_without_recovery
  26: syntax::parse::parser::Parser::parse_full_stmt
  27: syntax::parse::parser::Parser::parse_block_tail
  28: syntax::parse::parser::Parser::parse_inner_attrs_and_block
  29: syntax::parse::parser::Parser::parse_item_fn
  30: syntax::parse::parser::Parser::parse_item_implementation
  31: syntax::parse::parser::Parser::parse_item_
  32: syntax::parse::parser::Parser::parse_item
  33: syntax::parse::parser::Parser::parse_mod_items
  34: syntax::parse::parser::Parser::parse_crate_mod
  35: syntax::parse::parse_crate_from_file
  36: rustc_driver::driver::phase_1_parse_input::{{closure}}
  37: rustc::util::common::time
  38: rustc_driver::driver::phase_1_parse_input
  39: rustc_driver::driver::compile_input
  40: rustc_driver::run_compiler_with_pool
  41: <scoped_tls::ScopedKey<T>>::set
  42: rustc_driver::run_compiler
  43: <scoped_tls::ScopedKey<T>>::set
  44: syntax::with_globals
  45: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:102
  46: rustc_driver::run
  47: rustc_driver::main
  48: std::rt::lang_start::{{closure}}
  49: std::panicking::try::do_call
             at libstd/rt.rs:59
             at libstd/panicking.rs:310
  50: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:102
  51: std::rt::lang_start_internal
             at libstd/panicking.rs:289
             at libstd/panic.rs:392
             at libstd/rt.rs:58
  52: main
  53: __libc_start_main
  54: <unknown>
error: aborting due to previous error


error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.30.0-nightly (4591a245c 2018-09-22) running on x86_64-unknown-linux-gnu

This PR

$ rustc +5fd88ccbf4d20c70960c1b0e76fe82325e23a35e foo.rs
error: internal compiler error: Error constructed but not emitted

thread 'main' panicked at 'explicit panic', librustc_errors/diagnostic_builder.rs:340:13
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::print
             at libstd/sys_common/backtrace.rs:71
             at libstd/sys_common/backtrace.rs:59
   2: std::panicking::default_hook::{{closure}}
             at libstd/panicking.rs:211
   3: std::panicking::default_hook
             at libstd/panicking.rs:227
   4: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:477
   5: std::panicking::begin_panic
             at libstd/panicking.rs:411
   6: <rustc_errors::diagnostic_builder::DiagnosticBuilder<'a> as core::ops::drop::Drop>::drop
             at librustc_errors/diagnostic_builder.rs:340
   7: syntax::parse::parser::Parser::parse_pat_fields
             at libcore/ptr.rs:59
             at libsyntax/parse/parser.rs:3938
   8: syntax::parse::parser::Parser::parse_pat_with_range_pat
             at libsyntax/parse/parser.rs:4131
   9: syntax::parse::parser::Parser::parse_top_level_pat
             at libsyntax/parse/parser.rs:4011
             at libsyntax/parse/parser.rs:3978
  10: syntax::parse::parser::Parser::parse_pats
             at libsyntax/parse/parser.rs:3650
  11: syntax::parse::parser::Parser::parse_arm
             at libsyntax/parse/parser.rs:3544
  12: syntax::parse::parser::Parser::parse_bottom_expr
             at libsyntax/parse/parser.rs:3519
             at libsyntax/parse/parser.rs:2410
  13: syntax::parse::parser::Parser::parse_dot_or_call_expr
             at libsyntax/parse/parser.rs:2614
  14: syntax::parse::parser::Parser::parse_prefix_expr
             at libsyntax/parse/parser.rs:2957
  15: syntax::parse::parser::Parser::parse_assoc_expr_with
             at libsyntax/parse/parser.rs:2987
  16: syntax::parse::parser::Parser::parse_stmt_without_recovery
             at libsyntax/parse/parser.rs:2969
             at libsyntax/parse/parser.rs:3632
             at libsyntax/parse/parser.rs:3622
             at libsyntax/parse/parser.rs:3632
             at libsyntax/parse/parser.rs:4741
  17: syntax::parse::parser::Parser::parse_full_stmt
             at libsyntax/parse/parser.rs:4888
  18: syntax::parse::parser::Parser::parse_block_tail
             at libsyntax/parse/parser.rs:4855
  19: syntax::parse::parser::Parser::parse_inner_attrs_and_block
             at libsyntax/parse/parser.rs:4845
  20: syntax::parse::parser::Parser::parse_for_expr
             at libsyntax/parse/parser.rs:3426
  21: syntax::parse::parser::Parser::parse_bottom_expr
             at libsyntax/parse/parser.rs:2370
  22: syntax::parse::parser::Parser::parse_dot_or_call_expr
             at libsyntax/parse/parser.rs:2614
  23: syntax::parse::parser::Parser::parse_prefix_expr
             at libsyntax/parse/parser.rs:2957
  24: syntax::parse::parser::Parser::parse_assoc_expr_with
             at libsyntax/parse/parser.rs:2987
  25: syntax::parse::parser::Parser::parse_stmt_without_recovery
             at libsyntax/parse/parser.rs:2969
             at libsyntax/parse/parser.rs:3632
             at libsyntax/parse/parser.rs:3622
             at libsyntax/parse/parser.rs:3632
             at libsyntax/parse/parser.rs:4741
  26: syntax::parse::parser::Parser::parse_full_stmt
             at libsyntax/parse/parser.rs:4888
  27: syntax::parse::parser::Parser::parse_block_tail
             at libsyntax/parse/parser.rs:4855
  28: syntax::parse::parser::Parser::parse_inner_attrs_and_block
             at libsyntax/parse/parser.rs:4845
  29: syntax::parse::parser::Parser::parse_item_fn
             at libsyntax/parse/parser.rs:5560
  30: syntax::parse::parser::Parser::parse_item_implementation
             at libsyntax/parse/parser.rs:7100
  31: syntax::parse::parser::Parser::parse_item_
             at libsyntax/parse/parser.rs:6883
             at libsyntax/parse/parser.rs:7460
             at libsyntax/parse/parser.rs:6882
  32: syntax::parse::parser::Parser::parse_item
             at libsyntax/parse/parser.rs:7503
  33: syntax::parse::parser::Parser::parse_mod_items
             at libsyntax/parse/parser.rs:6250
  34: syntax::parse::parser::Parser::parse_crate_mod
             at libsyntax/parse/parser.rs:7586
  35: syntax::parse::parse_crate_from_file
             at libsyntax/parse/mod.rs:133
  36: rustc_driver::driver::phase_1_parse_input::{{closure}}
             at librustc_driver/driver.rs:683
  37: rustc::util::common::time
             at librustc/util/common.rs:163
             at librustc/util/common.rs:157
  38: rustc_driver::driver::phase_1_parse_input
             at librustc_driver/driver.rs:682
  39: rustc_driver::driver::compile_input
             at librustc_driver/driver.rs:158
  40: rustc_driver::run_compiler_with_pool
             at librustc_driver/lib.rs:562
  41: rustc_driver::driver::spawn_thread_pool
             at librustc_driver/lib.rs:484
             at librustc_driver/driver.rs:76
             at /cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/scoped-tls-0.1.2/src/lib.rs:155
             at librustc_driver/driver.rs:75
  42: rustc_driver::run_compiler
             at librustc_driver/lib.rs:483
  43: <scoped_tls::ScopedKey<T>>::set
             at librustc_driver/lib.rs:1744
             at librustc_driver/lib.rs:189
             at /cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/scoped-tls-0.1.2/src/lib.rs:155
             at libsyntax/lib.rs:107
             at /cargo/registry/src/gh.neting.cc-1ecc6299db9ec823/scoped-tls-0.1.2/src/lib.rs:155
  44: syntax::with_globals
             at libsyntax/lib.rs:106
  45: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:102
  46: rustc_driver::run
             at libstd/panicking.rs:289
             at libstd/panic.rs:392
             at librustc_driver/lib.rs:1573
             at librustc_driver/lib.rs:1584
             at librustc_driver/lib.rs:1658
             at librustc_driver/lib.rs:187
  47: rustc_driver::main
             at librustc_driver/lib.rs:1737
  48: std::rt::lang_start::{{closure}}
             at libstd/rt.rs:74
  49: std::panicking::try::do_call
             at libstd/rt.rs:59
             at libstd/panicking.rs:310
  50: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:102
  51: std::rt::lang_start_internal
             at libstd/panicking.rs:289
             at libstd/panic.rs:392
             at libstd/rt.rs:58
  52: main
  53: __libc_start_main
  54: <unknown>
error: aborting due to previous error


error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.30.0-nightly (5fd88ccbf 2018-09-22) running on x86_64-unknown-linux-gnu

Sure enough there's some nice line numbers in there! Furthermore these both take roughly the same amount of time (maybe 100ms difference at most).

All in all this seems fine by me, all the underlying bugs that motivated this decision originally have since been fixed, so it should be fine to do for our releases at least.

One final thing to consider is that debuginfo-lines takes more time to build (as it's more "gunk" for LLVM to chew through). Do we want this turned on by default for all developers? Or only turned on for our releases?

@eddyb
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eddyb commented Sep 24, 2018

@alexcrichton Whoa, nice, thanks for the writeup!
Can we get exact numbers of how much slower the build is? Anecdotally, I personally haven't noticed a particular slowdown, but it could probably be 10% or more without me being able to notice at all.

@alexcrichton
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Looking at just the CI build for this PR and a recent successful build, it looks like for CI this adds about 10-15 minutes to build time.

@michaelwoerister
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Wow, 10-15 minutes? I wouldn't have expected that.

@michaelwoerister
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I want to see if the resulting compiler is also slower.

@bors try

@pietroalbini
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We should already have a try build ready for this PR.

@tromey
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tromey commented Sep 25, 2018

FWIW hacking -g1 into the LLVM build over in the interminable #54004 helped break the logjam. All things being equal I'd be in favor of not just this change but also extending it to the LLVM build as well.

@TimNN TimNN added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Sep 25, 2018
@eddyb
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eddyb commented Sep 26, 2018

@rust-timer build 5fd88ccbf4d20c70960c1b0e76fe82325e23a35e

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Success: Queued 5fd88ccbf4d20c70960c1b0e76fe82325e23a35e with parent e7b5ba8, comparison URL.

@eddyb
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eddyb commented Sep 26, 2018

@alexcrichton @michaelwoerister I wonder how hard it would be to track down where we spend those extra dozen minutes - is it in rustc_codegen_llvm, in LLVM, or during linking?
We might be hitting something that we could improve for all debug builds.

@Mark-Simulacrum
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Hm, 10-15 minutes of build time seems like it might be too long. Could we perhaps save some time by only enabling this in stage 2 and on dist builds by default on CI? We can leave it on by default for local builds, I think.

@eddyb
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eddyb commented Sep 28, 2018

@Mark-Simulacrum Heh, I wanted to say the stage 2 thing myself, but then I thought that maybe this is a bug, and not the expected outcome.

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Hm, the perf build showed essentially no instruction difference but some possible wall time losses so I'd presume the slowdown lies somewhere outside of the core compiler - maybe copying/reading files is taking slightly longer due to increased size? @nnethercote, is there a chance you have some ideas about how we could try to narrow down the problem?

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The comparison URL results look like noise to me. (I mostly ignore the min and max columns to evaluate that, and focus on the avg column.)

As for the 10-15 minutes difference, I am skeptical about how reliable those time measurements are. I recently had a PR that was tested for landing and failed because one job hit the 3 hour timeout limit. Then on the subsequent run it only took 2.5 hours or so. So I would suggest remeasuring multiple times to get more confidence.

@RalfJung
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I did two complete builds with the only difference being debuginfo-lines. config.toml:

[llvm]
assertions = true
ninja = true
[build]
submodules = false
[rust]
debug-assertions = false
debuginfo-lines = true
incremental = false
test-miri = true
deny-warnings = false

Test command:

rm build/x86_64-unknown-linux-gnu/stage* -rf && time ./x.py build src/rustc

Without line debuginfo, this took

real	20m13,125s
user	108m10,488s
sys	1m0,044s

(Unfortunately, this also built a tiny bit of LLVM -- 73 files -- as I only noticed after the fact.)

With line debuginfo, this took

real	21m9,076s
user	114m16,748s
sys	1m2,455s

In particular, stage1 compiler artifacts went up from

    Finished release [optimized] target(s) in 9m 36s

to

    Finished release [optimized] target(s) in 10m 29s

So, looks like line debuginfo makes the compiler around 10% slower. That's more than what I expected.

Build log without line debuginfo
$ rm build/x86_64-unknown-linux-gnu/stage* -rf && time ./x.py build src/rustc
extracting /home/r/src/rust/rustc.2/build/cache/2018-09-11/rust-std-beta-x86_64-unknown-linux-gnu.tar.gz
extracting /home/r/src/rust/rustc.2/build/cache/2018-09-11/rustc-beta-x86_64-unknown-linux-gnu.tar.gz
extracting /home/r/src/rust/rustc.2/build/cache/2018-09-11/cargo-beta-x86_64-unknown-linux-gnu.tar.gz
   Compiling bootstrap v0.0.0 (file:///home/r/src/rust/rustc.2/src/bootstrap)                                                                                                                                      
    Finished dev [unoptimized] target(s) in 17.46s
Building stage0 std artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling cc v1.0.25                                                                                                                                                                                            
   Compiling core v0.0.0 (file:///home/r/src/rust/rustc.2/src/libcore)
   Compiling unwind v0.0.0 (file:///home/r/src/rust/rustc.2/src/libunwind)
   Compiling build_helper v0.1.0 (file:///home/r/src/rust/rustc.2/src/build_helper)
   Compiling compiler_builtins v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc/compiler_builtins_shim)
   Compiling cmake v0.1.33
   Compiling alloc_jemalloc v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc_jemalloc)
   Compiling std v0.0.0 (file:///home/r/src/rust/rustc.2/src/libstd)
   Compiling rustc_lsan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_lsan)
   Compiling rustc_tsan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_tsan)
   Compiling rustc_msan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_msan)
   Compiling rustc_asan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_asan)
   Compiling libc v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc/libc_shim)
   Compiling alloc v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc)
   Compiling alloc_system v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc_system)
   Compiling panic_abort v0.0.0 (file:///home/r/src/rust/rustc.2/src/libpanic_abort)
   Compiling panic_unwind v0.0.0 (file:///home/r/src/rust/rustc.2/src/libpanic_unwind)
    Finished release [optimized] target(s) in 26.28s
Copying stage0 std from stage0 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage0 test artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling term v0.0.0 (file:///home/r/src/rust/rustc.2/src/libterm)                                                                                                                                             
   Compiling getopts v0.2.17
   Compiling test v0.0.0 (file:///home/r/src/rust/rustc.2/src/libtest)
    Finished release [optimized] target(s) in 5.22s
Copying stage0 test from stage0 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage0 compiler artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling version_check v0.1.4                                                                                                                                                                                  
   Compiling cfg-if v0.1.5
   Compiling nodrop v0.1.12
   Compiling memoffset v0.2.1
   Compiling void v1.0.2
   Compiling scopeguard v0.3.3
   Compiling rustc-rayon-core v0.1.1
   Compiling stable_deref_trait v1.1.0
   Compiling libc v0.2.43
   Compiling rand_core v0.2.1
   Compiling byteorder v1.2.3
   Compiling unicode-width v0.1.5
   Compiling bitflags v1.0.4
   Compiling either v1.5.0
   Compiling scoped-tls v0.1.2
   Compiling cc v1.0.25
   Compiling rustc_target v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_target)
   Compiling syntax v0.0.0 (file:///home/r/src/rust/rustc.2/src/libsyntax)
   Compiling termcolor v1.0.2
   Compiling lazy_static v0.2.11
   Compiling rustc-demangle v0.1.9
   Compiling rustc v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc)
   Compiling datafrog v0.1.0
   Compiling remove_dir_all v0.5.1
   Compiling fmt_macros v0.0.0 (file:///home/r/src/rust/rustc.2/src/libfmt_macros)
   Compiling rustc_fs_util v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_fs_util)
   Compiling graphviz v0.0.0 (file:///home/r/src/rust/rustc.2/src/libgraphviz)
   Compiling rustc_incremental v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_incremental)
   Compiling rustc-serialize v0.3.24
   Compiling rustc_metadata v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_metadata)
   Compiling quick-error v1.2.2
   Compiling rustc_platform_intrinsics v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_platform_intrinsics)
   Compiling rustc_driver v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_driver)
   Compiling crossbeam-utils v0.2.2
   Compiling log v0.4.4
   Compiling arrayvec v0.4.7
   Compiling unreachable v1.0.0
   Compiling owning_ref v0.3.3
   Compiling chalk-macros v0.1.0
   Compiling rustc-hash v1.0.1
   Compiling rand v0.4.3
   Compiling num_cpus v1.8.0
   Compiling rand v0.5.5
   Compiling atty v0.2.11
   Compiling lazy_static v1.1.0
   Compiling humantime v1.1.1
   Compiling smallvec v0.6.5
   Compiling lock_api v0.1.3
   Compiling rustc_cratesio_shim v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_cratesio_shim)
   Compiling ena v0.9.3
   Compiling jobserver v0.1.11
   Compiling polonius-engine v0.5.0
   Compiling chalk-engine v0.7.0
   Compiling rustc_apfloat v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_apfloat)
   Compiling backtrace-sys v0.1.24
   Compiling miniz-sys v0.1.10
   Compiling serialize v0.0.0 (file:///home/r/src/rust/rustc.2/src/libserialize)
   Compiling parking_lot_core v0.2.14
   Compiling env_logger v0.5.12
   Compiling parking_lot_core v0.3.0
   Compiling tempfile v3.0.3
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   Compiling log_settings v0.1.2
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   Compiling backtrace v0.3.9
   Compiling rls-data v0.18.1
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   Compiling rustc-rayon v0.1.1
   Compiling rustc_data_structures v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_data_structures)
   Compiling arena v0.0.0 (file:///home/r/src/rust/rustc.2/src/libarena)
   Compiling syntax_pos v0.0.0 (file:///home/r/src/rust/rustc.2/src/libsyntax_pos)
   Compiling rustc_errors v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_errors)
   Compiling proc_macro v0.0.0 (file:///home/r/src/rust/rustc.2/src/libproc_macro)
   Compiling syntax_ext v0.0.0 (file:///home/r/src/rust/rustc.2/src/libsyntax_ext)
   Compiling rustc_mir v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_mir)
   Compiling rustc_metadata_utils v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_metadata_utils)
   Compiling rustc_typeck v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_typeck)
   Compiling rustc_allocator v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_allocator)
   Compiling rustc_traits v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_traits)
   Compiling rustc_plugin v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_plugin)
   Compiling rustc_resolve v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_resolve)
   Compiling rustc_privacy v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_privacy)
   Compiling rustc_codegen_utils v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_codegen_utils)
   Compiling rustc_lint v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_lint)
   Compiling rustc_borrowck v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_borrowck)
   Compiling rustc_passes v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_passes)
   Compiling rustc_save_analysis v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_save_analysis)
   Compiling rustc-main v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc)
    Finished release [optimized] target(s) in 6m 38s
Copying stage0 rustc from stage0 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building LLVM for x86_64-unknown-linux-gnu
running: "cmake" "/home/r/src/rust/rustc.2/src/llvm" "-G" "Ninja" "-DLLVM_ENABLE_ASSERTIONS=ON" "-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64;Mips;PowerPC;SystemZ;MSP430;Sparc;NVPTX;Hexagon" "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly;RISCV" "-DLLVM_INCLUDE_EXAMPLES=OFF" "-DLLVM_INCLUDE_TESTS=OFF" "-DLLVM_INCLUDE_DOCS=OFF" "-DLLVM_INCLUDE_BENCHMARKS=OFF" "-DLLVM_ENABLE_ZLIB=OFF" "-DWITH_POLLY=OFF" "-DLLVM_ENABLE_TERMINFO=OFF" "-DLLVM_ENABLE_LIBEDIT=OFF" "-DLLVM_PARALLEL_COMPILE_JOBS=8" "-DLLVM_TARGET_ARCH=x86_64" "-DLLVM_DEFAULT_TARGET_TRIPLE=x86_64-unknown-linux-gnu" "-DLLVM_OCAML_INSTALL_PATH=usr/lib/ocaml" "-DLLVM_LINK_LLVM_DYLIB=ON" "-DLLVM_ENABLE_LIBXML2=OFF" "-DPYTHON_EXECUTABLE=/usr/bin/python" "-DCMAKE_C_COMPILER=cc" "-DCMAKE_CXX_COMPILER=c++" "-DCMAKE_C_FLAGS=-ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_CXX_FLAGS=-ffunction-sections -fdata-sections -fPIC -m64" "-DCMAKE_INSTALL_PREFIX=/home/r/src/rust/rustc.2/build/x86_64-unknown-linux-gnu/llvm" "-DCMAKE_BUILD_TYPE=Release"
-- Native target architecture is X86
-- Threads enabled.
-- Doxygen disabled.
-- Go bindings disabled.
-- OCaml bindings disabled, need ctypes >=0.4.
-- Found Python module pygments
-- Found Python module pygments.lexers.c_cpp
-- Found Python module yaml
-- LLVM host triple: x86_64-unknown-linux-gnu
-- LLVM default target triple: x86_64-unknown-linux-gnu
-- Building with -fPIC
-- Constructing LLVMBuild project information
-- Linker detection: GNU ld
-- Targeting X86
-- Targeting ARM
-- Targeting AArch64
-- Targeting Mips
-- Targeting PowerPC
-- Targeting SystemZ
-- Targeting MSP430
-- Targeting Sparc
-- Targeting NVPTX
-- Targeting Hexagon
-- Targeting WebAssembly
-- Targeting RISCV
-- Configuring done
-- Generating done
-- Build files have been written to: /home/r/src/rust/rustc.2/build/x86_64-unknown-linux-gnu/llvm/build
running: "cmake" "--build" "." "--target" "install" "--config" "Release" "--" "-j" "8"
[8/73] Building CXX object lib/Target/PowerPC/CMakeFiles/LLVMPowerPCCodeGen.dir/PPCISelLowering.cpp.o
In file included from /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/TargetSubtargetInfo.h:22,
                 from /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/MachineRegisterInfo.h:32,
                 from /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/LiveRegUnits.h:19,
                 from /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/TargetInstrInfo.h:21,
                 from /home/r/src/rust/rustc.2/src/llvm/lib/Target/PowerPC/PPCInstrInfo.h:19,
                 from /home/r/src/rust/rustc.2/src/llvm/lib/Target/PowerPC/PPCISelLowering.h:19,
                 from /home/r/src/rust/rustc.2/src/llvm/lib/Target/PowerPC/PPCISelLowering.cpp:14:
/home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/SchedulerRegistry.h: In constructor ‘llvm::RegisterScheduler::RegisterScheduler(const char*, const char*, llvm::RegisterScheduler::FunctionPassCtor)’:
/home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/SchedulerRegistry.h:40:52: warning: cast between incompatible function types from ‘llvm::RegisterScheduler::FunctionPassCtor’ {aka ‘llvm::ScheduleDAGSDNodes* (*)(llvm::SelectionDAGISel*, llvm::CodeGenOpt::Level)’} to ‘llvm::MachinePassCtor’ {aka ‘void* (*)()’} [-Wcast-function-type]
   : MachinePassRegistryNode(N, D, (MachinePassCtor)C)
                                                    ^
[72/73] Install the project...
-- Install configuration: "Release"
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cargo:root=/home/r/src/rust/rustc.2/build/x86_64-unknown-linux-gnu/llvm
	finished in 28.979
Building stage0 codegen artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu, llvm)
   Compiling cc v1.0.25                                                                                                                                                                                            
   Compiling build_helper v0.1.0 (file:///home/r/src/rust/rustc.2/src/build_helper)
   Compiling libc v0.2.43
   Compiling rustc_codegen_llvm v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_codegen_llvm)
   Compiling rustc-demangle v0.1.9
   Compiling num_cpus v1.8.0
   Compiling memmap v0.6.2
   Compiling rustc_llvm v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_llvm)
warning: In file included from /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/TargetSubtargetInfo.h:22,
warning:                  from ../rustllvm/PassWrapper.cpp:29:
warning: /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/SchedulerRegistry.h: In constructor ‘llvm::RegisterScheduler::RegisterScheduler(const char*, const char*, llvm::RegisterScheduler::FunctionPassCtor)’:
warning: /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/SchedulerRegistry.h:40:52: warning: cast between incompatible function types from ‘llvm::RegisterScheduler::FunctionPassCtor’ {aka ‘llvm::ScheduleDAGSDNodes* (*)(llvm::SelectionDAGISel*, llvm::CodeGenOpt::Level)’} to ‘llvm::MachinePassCtor’ {aka ‘void* (*)()’} [-Wcast-function-type]
warning:    : MachinePassRegistryNode(N, D, (MachinePassCtor)C)
warning:                                                     ^
    Finished release [optimized] target(s) in 47.59s
Assembling stage1 compiler (x86_64-unknown-linux-gnu)
Building stage1 std artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling cc v1.0.25                                                                                                                                                                                            
   Compiling core v0.0.0 (file:///home/r/src/rust/rustc.2/src/libcore)
   Compiling build_helper v0.1.0 (file:///home/r/src/rust/rustc.2/src/build_helper)
   Compiling unwind v0.0.0 (file:///home/r/src/rust/rustc.2/src/libunwind)
   Compiling compiler_builtins v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc/compiler_builtins_shim)
   Compiling cmake v0.1.33
   Compiling alloc_jemalloc v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc_jemalloc)
   Compiling std v0.0.0 (file:///home/r/src/rust/rustc.2/src/libstd)
   Compiling rustc_asan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_asan)
   Compiling rustc_lsan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_lsan)
   Compiling rustc_msan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_msan)
   Compiling rustc_tsan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_tsan)
   Compiling libc v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc/libc_shim)
   Compiling alloc v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc)
   Compiling alloc_system v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc_system)
   Compiling panic_abort v0.0.0 (file:///home/r/src/rust/rustc.2/src/libpanic_abort)
   Compiling panic_unwind v0.0.0 (file:///home/r/src/rust/rustc.2/src/libpanic_unwind)
    Finished release [optimized] target(s) in 38.22s
Copying stage1 std from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage1 test artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling getopts v0.2.17                                                                                                                                                                                       
   Compiling term v0.0.0 (file:///home/r/src/rust/rustc.2/src/libterm)
   Compiling test v0.0.0 (file:///home/r/src/rust/rustc.2/src/libtest)
    Finished release [optimized] target(s) in 7.49s
Copying stage1 test from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage1 compiler artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling version_check v0.1.4                                                                                                                                                                                  
   Compiling nodrop v0.1.12
   Compiling cfg-if v0.1.5
   Compiling memoffset v0.2.1
   Compiling void v1.0.2
   Compiling scopeguard v0.3.3
   Compiling stable_deref_trait v1.1.0
   Compiling rustc-rayon-core v0.1.1
   Compiling rand_core v0.2.1
   Compiling libc v0.2.43
   Compiling unicode-width v0.1.5
   Compiling byteorder v1.2.3
   Compiling either v1.5.0
   Compiling bitflags v1.0.4
   Compiling rustc_target v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_target)
   Compiling cc v1.0.25
   Compiling scoped-tls v0.1.2
   Compiling termcolor v1.0.2
   Compiling syntax v0.0.0 (file:///home/r/src/rust/rustc.2/src/libsyntax)
   Compiling lazy_static v0.2.11
   Compiling rustc v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc)
   Compiling rustc-demangle v0.1.9
   Compiling remove_dir_all v0.5.1
   Compiling datafrog v0.1.0
   Compiling rustc_incremental v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_incremental)
   Compiling graphviz v0.0.0 (file:///home/r/src/rust/rustc.2/src/libgraphviz)
   Compiling fmt_macros v0.0.0 (file:///home/r/src/rust/rustc.2/src/libfmt_macros)
   Compiling rustc_fs_util v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_fs_util)
   Compiling rustc_metadata v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_metadata)
   Compiling rustc-serialize v0.3.24
   Compiling quick-error v1.2.2
   Compiling rustc_platform_intrinsics v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_platform_intrinsics)
   Compiling rustc_driver v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_driver)
   Compiling crossbeam-utils v0.2.2
   Compiling log v0.4.4
   Compiling arrayvec v0.4.7
   Compiling unreachable v1.0.0
   Compiling owning_ref v0.3.3
   Compiling chalk-macros v0.1.0
   Compiling rustc-hash v1.0.1
   Compiling rand v0.4.3
   Compiling rand v0.5.5
   Compiling num_cpus v1.8.0
   Compiling atty v0.2.11
   Compiling lazy_static v1.1.0
   Compiling humantime v1.1.1
   Compiling smallvec v0.6.5
   Compiling lock_api v0.1.3
   Compiling rustc_cratesio_shim v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_cratesio_shim)
   Compiling ena v0.9.3
   Compiling polonius-engine v0.5.0
   Compiling jobserver v0.1.11
   Compiling chalk-engine v0.7.0
   Compiling backtrace-sys v0.1.24
   Compiling miniz-sys v0.1.10
   Compiling env_logger v0.5.12
   Compiling tempfile v3.0.3
   Compiling rustc_apfloat v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_apfloat)
   Compiling parking_lot_core v0.3.0
   Compiling parking_lot_core v0.2.14
   Compiling serialize v0.0.0 (file:///home/r/src/rust/rustc.2/src/libserialize)
   Compiling rls-span v0.4.0
   Compiling crossbeam-epoch v0.3.1
   Compiling log_settings v0.1.2
   Compiling parking_lot v0.6.4
   Compiling backtrace v0.3.9
   Compiling rls-data v0.18.1
   Compiling crossbeam-deque v0.2.0
   Compiling flate2 v1.0.2
   Compiling rustc-rayon v0.1.1
   Compiling rustc_data_structures v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_data_structures)
   Compiling arena v0.0.0 (file:///home/r/src/rust/rustc.2/src/libarena)
   Compiling syntax_pos v0.0.0 (file:///home/r/src/rust/rustc.2/src/libsyntax_pos)
   Compiling rustc_errors v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_errors)
   Compiling proc_macro v0.0.0 (file:///home/r/src/rust/rustc.2/src/libproc_macro)
   Compiling syntax_ext v0.0.0 (file:///home/r/src/rust/rustc.2/src/libsyntax_ext)
   Compiling rustc_metadata_utils v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_metadata_utils)
   Compiling rustc_mir v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_mir)
   Compiling rustc_typeck v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_typeck)
   Compiling rustc_traits v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_traits)
   Compiling rustc_allocator v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_allocator)
   Compiling rustc_plugin v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_plugin)
   Compiling rustc_resolve v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_resolve)
   Compiling rustc_privacy v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_privacy)
   Compiling rustc_codegen_utils v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_codegen_utils)
   Compiling rustc_passes v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_passes)
   Compiling rustc_lint v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_lint)
   Compiling rustc_borrowck v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_borrowck)
   Compiling rustc_save_analysis v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_save_analysis)
   Compiling rustc-main v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc)
    Finished release [optimized] target(s) in 9m 36s
Copying stage1 rustc from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage1 codegen artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu, llvm)
   Compiling build_helper v0.1.0 (file:///home/r/src/rust/rustc.2/src/build_helper)                                                                                                                                
   Compiling cc v1.0.25
   Compiling libc v0.2.43
   Compiling rustc_codegen_llvm v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_codegen_llvm)
   Compiling rustc-demangle v0.1.9
   Compiling num_cpus v1.8.0
   Compiling memmap v0.6.2
   Compiling rustc_llvm v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_llvm)
warning: In file included from /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/TargetSubtargetInfo.h:22,
warning:                  from ../rustllvm/PassWrapper.cpp:29:
warning: /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/SchedulerRegistry.h: In constructor ‘llvm::RegisterScheduler::RegisterScheduler(const char*, const char*, llvm::RegisterScheduler::FunctionPassCtor)’:
warning: /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/SchedulerRegistry.h:40:52: warning: cast between incompatible function types from ‘llvm::RegisterScheduler::FunctionPassCtor’ {aka ‘llvm::ScheduleDAGSDNodes* (*)(llvm::SelectionDAGISel*, llvm::CodeGenOpt::Level)’} to ‘llvm::MachinePassCtor’ {aka ‘void* (*)()’} [-Wcast-function-type]
warning:    : MachinePassRegistryNode(N, D, (MachinePassCtor)C)
warning:                                                     ^
    Finished release [optimized] target(s) in 1m 01s
Assembling stage2 compiler (x86_64-unknown-linux-gnu)
Uplifting stage1 std (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
Copying stage2 std from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Uplifting stage1 test (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
Copying stage2 test from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Uplifting stage1 rustc (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
Copying stage2 rustc from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Build completed successfully in 0:20:13

real	20m13,125s
user	108m10,488s
sys	1m0,044s
Build log with line debuginfo
$ rm build/x86_64-unknown-linux-gnu/stage* -rf && time ./x.py build src/rustc
extracting /home/r/src/rust/rustc.2/build/cache/2018-09-11/rust-std-beta-x86_64-unknown-linux-gnu.tar.gz
extracting /home/r/src/rust/rustc.2/build/cache/2018-09-11/rustc-beta-x86_64-unknown-linux-gnu.tar.gz
extracting /home/r/src/rust/rustc.2/build/cache/2018-09-11/cargo-beta-x86_64-unknown-linux-gnu.tar.gz
    Finished dev [unoptimized] target(s) in 0.25s                                                                                                                                                                  
Building stage0 std artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling cc v1.0.25                                                                                                                                                                                            
   Compiling core v0.0.0 (file:///home/r/src/rust/rustc.2/src/libcore)
   Compiling unwind v0.0.0 (file:///home/r/src/rust/rustc.2/src/libunwind)
   Compiling build_helper v0.1.0 (file:///home/r/src/rust/rustc.2/src/build_helper)
   Compiling compiler_builtins v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc/compiler_builtins_shim)
   Compiling cmake v0.1.33
   Compiling alloc_jemalloc v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc_jemalloc)
   Compiling std v0.0.0 (file:///home/r/src/rust/rustc.2/src/libstd)
   Compiling rustc_asan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_asan)
   Compiling rustc_lsan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_lsan)
   Compiling rustc_tsan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_tsan)
   Compiling rustc_msan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_msan)
   Compiling libc v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc/libc_shim)
   Compiling alloc v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc)
   Compiling alloc_system v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc_system)
   Compiling panic_abort v0.0.0 (file:///home/r/src/rust/rustc.2/src/libpanic_abort)
   Compiling panic_unwind v0.0.0 (file:///home/r/src/rust/rustc.2/src/libpanic_unwind)
    Finished release [optimized] target(s) in 27.43s
Copying stage0 std from stage0 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage0 test artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling getopts v0.2.17                                                                                                                                                                                       
   Compiling term v0.0.0 (file:///home/r/src/rust/rustc.2/src/libterm)
   Compiling test v0.0.0 (file:///home/r/src/rust/rustc.2/src/libtest)
    Finished release [optimized] target(s) in 5.64s
Copying stage0 test from stage0 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage0 compiler artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling version_check v0.1.4                                                                                                                                                                                  
   Compiling cfg-if v0.1.5
   Compiling nodrop v0.1.12
   Compiling scopeguard v0.3.3
   Compiling void v1.0.2
   Compiling memoffset v0.2.1
   Compiling rand_core v0.2.1
   Compiling stable_deref_trait v1.1.0
   Compiling libc v0.2.43
   Compiling rustc-rayon-core v0.1.1
   Compiling unicode-width v0.1.5
   Compiling either v1.5.0
   Compiling byteorder v1.2.3
   Compiling bitflags v1.0.4
   Compiling cc v1.0.25
   Compiling rustc_target v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_target)
   Compiling scoped-tls v0.1.2
   Compiling syntax v0.0.0 (file:///home/r/src/rust/rustc.2/src/libsyntax)
   Compiling termcolor v1.0.2
   Compiling lazy_static v0.2.11
   Compiling rustc-demangle v0.1.9
   Compiling remove_dir_all v0.5.1
   Compiling datafrog v0.1.0
   Compiling rustc v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc)
   Compiling graphviz v0.0.0 (file:///home/r/src/rust/rustc.2/src/libgraphviz)
   Compiling fmt_macros v0.0.0 (file:///home/r/src/rust/rustc.2/src/libfmt_macros)
   Compiling rustc_incremental v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_incremental)
   Compiling rustc_fs_util v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_fs_util)
   Compiling rustc_metadata v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_metadata)
   Compiling rustc-serialize v0.3.24
   Compiling quick-error v1.2.2
   Compiling rustc_platform_intrinsics v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_platform_intrinsics)
   Compiling rustc_driver v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_driver)
   Compiling crossbeam-utils v0.2.2
   Compiling log v0.4.4
   Compiling arrayvec v0.4.7
   Compiling unreachable v1.0.0
   Compiling owning_ref v0.3.3
   Compiling chalk-macros v0.1.0
   Compiling rustc-hash v1.0.1
   Compiling lazy_static v1.1.0
   Compiling rand v0.4.3
   Compiling num_cpus v1.8.0
   Compiling rand v0.5.5
   Compiling atty v0.2.11
   Compiling humantime v1.1.1
   Compiling smallvec v0.6.5
   Compiling lock_api v0.1.3
   Compiling ena v0.9.3
   Compiling rustc_cratesio_shim v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_cratesio_shim)
   Compiling jobserver v0.1.11
   Compiling polonius-engine v0.5.0
   Compiling chalk-engine v0.7.0
   Compiling serialize v0.0.0 (file:///home/r/src/rust/rustc.2/src/libserialize)
   Compiling env_logger v0.5.12
   Compiling backtrace-sys v0.1.24
   Compiling miniz-sys v0.1.10
   Compiling rustc_apfloat v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_apfloat)
   Compiling parking_lot_core v0.2.14
   Compiling parking_lot_core v0.3.0
   Compiling tempfile v3.0.3
   Compiling rls-span v0.4.0
   Compiling crossbeam-epoch v0.3.1
   Compiling log_settings v0.1.2
   Compiling parking_lot v0.6.4
   Compiling rls-data v0.18.1
   Compiling crossbeam-deque v0.2.0
   Compiling backtrace v0.3.9
   Compiling flate2 v1.0.2
   Compiling rustc-rayon v0.1.1
   Compiling rustc_data_structures v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_data_structures)
   Compiling arena v0.0.0 (file:///home/r/src/rust/rustc.2/src/libarena)
   Compiling syntax_pos v0.0.0 (file:///home/r/src/rust/rustc.2/src/libsyntax_pos)
   Compiling rustc_errors v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_errors)
   Compiling proc_macro v0.0.0 (file:///home/r/src/rust/rustc.2/src/libproc_macro)
   Compiling syntax_ext v0.0.0 (file:///home/r/src/rust/rustc.2/src/libsyntax_ext)
   Compiling rustc_metadata_utils v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_metadata_utils)
   Compiling rustc_mir v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_mir)
   Compiling rustc_typeck v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_typeck)
   Compiling rustc_traits v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_traits)
   Compiling rustc_allocator v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_allocator)
   Compiling rustc_plugin v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_plugin)
   Compiling rustc_resolve v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_resolve)
   Compiling rustc_privacy v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_privacy)
   Compiling rustc_codegen_utils v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_codegen_utils)
   Compiling rustc_passes v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_passes)
   Compiling rustc_borrowck v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_borrowck)
   Compiling rustc_lint v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_lint)
   Compiling rustc_save_analysis v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_save_analysis)
   Compiling rustc-main v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc)
    Finished release [optimized] target(s) in 7m 15s
Copying stage0 rustc from stage0 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage0 codegen artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu, llvm)
   Compiling cc v1.0.25                                                                                                                                                                                            
   Compiling build_helper v0.1.0 (file:///home/r/src/rust/rustc.2/src/build_helper)
   Compiling rustc_codegen_llvm v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_codegen_llvm)
   Compiling libc v0.2.43
   Compiling rustc-demangle v0.1.9
   Compiling memmap v0.6.2
   Compiling num_cpus v1.8.0
   Compiling rustc_llvm v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_llvm)
warning: In file included from /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/TargetSubtargetInfo.h:22,
warning:                  from ../rustllvm/PassWrapper.cpp:29:
warning: /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/SchedulerRegistry.h: In constructor ‘llvm::RegisterScheduler::RegisterScheduler(const char*, const char*, llvm::RegisterScheduler::FunctionPassCtor)’:
warning: /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/SchedulerRegistry.h:40:52: warning: cast between incompatible function types from ‘llvm::RegisterScheduler::FunctionPassCtor’ {aka ‘llvm::ScheduleDAGSDNodes* (*)(llvm::SelectionDAGISel*, llvm::CodeGenOpt::Level)’} to ‘llvm::MachinePassCtor’ {aka ‘void* (*)()’} [-Wcast-function-type]
warning:    : MachinePassRegistryNode(N, D, (MachinePassCtor)C)
warning:                                                     ^
    Finished release [optimized] target(s) in 50.69s
Assembling stage1 compiler (x86_64-unknown-linux-gnu)
Building stage1 std artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling cc v1.0.25                                                                                                                                                                                            
   Compiling core v0.0.0 (file:///home/r/src/rust/rustc.2/src/libcore)
   Compiling unwind v0.0.0 (file:///home/r/src/rust/rustc.2/src/libunwind)
   Compiling build_helper v0.1.0 (file:///home/r/src/rust/rustc.2/src/build_helper)
   Compiling compiler_builtins v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc/compiler_builtins_shim)
   Compiling cmake v0.1.33
   Compiling alloc_jemalloc v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc_jemalloc)
   Compiling std v0.0.0 (file:///home/r/src/rust/rustc.2/src/libstd)
   Compiling rustc_tsan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_tsan)
   Compiling rustc_lsan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_lsan)
   Compiling rustc_msan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_msan)
   Compiling rustc_asan v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_asan)
   Compiling libc v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc/libc_shim)
   Compiling alloc v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc)
   Compiling alloc_system v0.0.0 (file:///home/r/src/rust/rustc.2/src/liballoc_system)
   Compiling panic_abort v0.0.0 (file:///home/r/src/rust/rustc.2/src/libpanic_abort)
   Compiling panic_unwind v0.0.0 (file:///home/r/src/rust/rustc.2/src/libpanic_unwind)
    Finished release [optimized] target(s) in 39.07s
Copying stage1 std from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage1 test artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling term v0.0.0 (file:///home/r/src/rust/rustc.2/src/libterm)                                                                                                                                             
   Compiling getopts v0.2.17
   Compiling test v0.0.0 (file:///home/r/src/rust/rustc.2/src/libtest)
    Finished release [optimized] target(s) in 7.96s
Copying stage1 test from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage1 compiler artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
   Compiling version_check v0.1.4                                                                                                                                                                                  
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   Compiling rustc-main v0.0.0 (file:///home/r/src/rust/rustc.2/src/rustc)
    Finished release [optimized] target(s) in 10m 29s
Copying stage1 rustc from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Building stage1 codegen artifacts (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu, llvm)
   Compiling cc v1.0.25                                                                                                                                                                                            
   Compiling build_helper v0.1.0 (file:///home/r/src/rust/rustc.2/src/build_helper)
   Compiling rustc_codegen_llvm v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_codegen_llvm)
   Compiling libc v0.2.43
   Compiling rustc-demangle v0.1.9
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   Compiling memmap v0.6.2
   Compiling rustc_llvm v0.0.0 (file:///home/r/src/rust/rustc.2/src/librustc_llvm)
warning: In file included from /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/TargetSubtargetInfo.h:22,
warning:                  from ../rustllvm/PassWrapper.cpp:29:
warning: /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/SchedulerRegistry.h: In constructor ‘llvm::RegisterScheduler::RegisterScheduler(const char*, const char*, llvm::RegisterScheduler::FunctionPassCtor)’:
warning: /home/r/src/rust/rustc.2/src/llvm/include/llvm/CodeGen/SchedulerRegistry.h:40:52: warning: cast between incompatible function types from ‘llvm::RegisterScheduler::FunctionPassCtor’ {aka ‘llvm::ScheduleDAGSDNodes* (*)(llvm::SelectionDAGISel*, llvm::CodeGenOpt::Level)’} to ‘llvm::MachinePassCtor’ {aka ‘void* (*)()’} [-Wcast-function-type]
warning:    : MachinePassRegistryNode(N, D, (MachinePassCtor)C)
warning:                                                     ^
    Finished release [optimized] target(s) in 1m 07s
Assembling stage2 compiler (x86_64-unknown-linux-gnu)
Uplifting stage1 std (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
Copying stage2 std from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Uplifting stage1 test (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
Copying stage2 test from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Uplifting stage1 rustc (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu)
Copying stage2 rustc from stage1 (x86_64-unknown-linux-gnu -> x86_64-unknown-linux-gnu / x86_64-unknown-linux-gnu)
Build completed successfully in 0:21:09

real	21m9,076s
user	114m16,748s
sys	1m2,455s

@TimNN
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TimNN commented Oct 16, 2018

Ping from triage @eddyb / @alexcrichton! It' been a while since this PR has been updated. How do you want to move forward with it?

@alexcrichton
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@eddyb are you still intersted in landing this?

@RalfJung FWIW your timings are probably not the compiler slowing down, but rather generating debuginfo for the compiler causes the compiler to be compiled slower

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TimNN commented Oct 30, 2018

Ping from triage @eddyb! We haven't heard from you in a while so I'm closing PR for, per our guidelines. Thanks for your contributions and please feel free to re-open this PR in the future.

@TimNN TimNN closed this Oct 30, 2018
@TimNN TimNN added S-inactive Status: Inactive and waiting on the author. This is often applied to closed PRs. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Oct 30, 2018
@eddyb
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eddyb commented Nov 3, 2018

@alexcrichton Yes, I'd like to land this, but only if the slowdown is considered acceptable, or someone else investigates it.

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eddyb commented Nov 22, 2018

@michaelwoerister Could this be from linking? Have we experimented with lld for linking rustc?

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Could this be from linking?

Hard to tell without actual numbers.

Have we experimented with lld for linking rustc?

The dist builds on CI already use LLD. I don't know about the other builders.

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Could we merge this and see if it really affects CI build times as negatively as it looked in that one build?

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eddyb commented Nov 22, 2018

@michaelwoerister And revert it if we see a statistically significant impact?

@eddyb eddyb reopened this Nov 22, 2018
@eddyb eddyb force-pushed the it's-backtrace-not-badguess branch from 6c4d7a3 to 5256d3e Compare November 22, 2018 15:17
@michaelwoerister
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@eddyb Yes. If it causes trouble, we can still back it out.

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May concerns on compilation performance have been addressed. Since the remaining concerns are about CI build times: r? @alexcrichton

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I don't think we have a great grasp on what the CI times here are, and we're already severely bleeding for CI times right now as most builds are pushing 2.5 hours when we ideally shoot for 2 hours. I would personally rather get build times under control before we continue to land minor build time regressions like this. We can make exceptions of course, but this seems like a nice-to-have rather than a hard requirement of something.

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And some Windows builds are regularly exceeding 3 hours.

@TimNN TimNN added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-inactive Status: Inactive and waiting on the author. This is often applied to closed PRs. labels Nov 27, 2018
@Dylan-DPC-zz
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Ping from triage. @alexcrichton any updates on this? is this blocked on anything?

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I personally feel the same way still. I don't think we have budget on CI to land this yet

@Centril Centril added S-blocked-closed and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Dec 24, 2018
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Centril commented Dec 24, 2018

Ping from triage: based on #54459 (comment) I'll close this for now. Let's revisit if our CI situation changes.

@Centril Centril closed this Dec 24, 2018
@jyn514 jyn514 added S-blocked Status: Blocked on something else such as an RFC or other implementation work. and removed S-blocked-closed labels Mar 10, 2021
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