[llvm-dwp] Join dwo paths correctly when DWOPath is absolute #90
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When the `DWOPath` is absolute, we want to use `DWOPath` as is, without prepending any other
components to the path. The `sys::path::append` does not join, but rather unconditionally appends
the paths, so something like `sys::path::append("/tmp", "/tmp/banana")` will result in
`/tmp/tmp/banana` rather than the desired `/tmp/banana`.
This then causes `llvm-dwp` to fail in a following situation:
```
$ clang -gsplit-dwarf /tmp/banana/test.c -c -o /tmp/outdir/foo.o
$ clang outdir/foo.o -o outdir/hm
$ llvm-dwarfdump outdir/hm | grep -C2 foo.dwo
DW_AT_comp_dir ("/tmp")
DW_AT_GNU_pubnames (true)
DW_AT_GNU_dwo_name ("/tmp/outdir/foo.dwo")
DW_AT_GNU_dwo_id (0xde4d396f3bf0e257)
DW_AT_low_pc (0x0000000000401100)
$ strace -o trace llvm-dwp -e outdir/hm -o outdir/hm.dwp
error: No such file or directory
$ cat trace | grep foo.dwo
openat(AT_FDCWD, "/tmp/tmp/outdir/foo.dwo", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
```
Reviewed By: dblaikie
Differential Revision: https://reviews.llvm.org/D96678
Backport of: 6ffcb29
nagisa
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to nagisa/rust
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Feb 20, 2021
Includes rust-lang/llvm-project#90 in particular.
vext01
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to vext01/llvm-project
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Oct 9, 2023
90: Give the call instruction some love. r=ltratt a=vext01 Co-authored-by: Edd Barrett <vext01@gmail.com>
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When the
DWOPathis absolute, we want to useDWOPathas is, without prepending any othercomponents to the path. The
sys::path::appenddoes not join, but rather unconditionally appendsthe paths, so something like
sys::path::append("/tmp", "/tmp/banana")will result in/tmp/tmp/bananarather than the desired/tmp/banana.This then causes
llvm-dwpto fail in a following situation:Reviewed By: dblaikie
Differential Revision: https://reviews.llvm.org/D96678
Backport of: 6ffcb29