Commits on Sep 5, 2018

1. rustbuild: Tweak LLVM distribution layout …

   This commit tweaks the layout of a few components that we distribute to
   hopefully fix across all platforms the recent issues with LLD being unable to
   find the LLVM shared object. In rust-lang#53245 we switched to building LLVM as a dynamic
   library, which means that LLVM tools by default link to LLVM dynamically rather
   than statically. This in turn means that the tools, at runtime, need to find the
   LLVM shared library.
   
   LLVM's shared library is currently distributed as part of the rustc component.
   This library is located, however, at `$sysroot/lib`. The LLVM tools we ship are
   in two locations:
   
   * LLD is shipped at `$sysroot/lib/rustlib/$host/bin/rust-lld`
   * Other LLVM tools are shipped at `$sysroot/bin`
   
   Each LLVM tool has an embedded rpath directive indicating where it will search
   for dynamic libraries. This currently points to `../lib` and is presumably
   inserted by LLVM's build system. Unfortunately, though, this directive is only
   correct for the LLVM tools at `$sysroot/bin`, not LLD!
   
   This commit is targeted at fixing this situation by making two changes:
   
   * LLVM tools other than LLD are moved in the distribution to
     `$sysroot/lib/rustlib/$host/bin`. This moves them next to LLD and should
     position them for...
   * The LLVM shared object is moved to `$sysroot/lib/rustlib/$host/lib`
   
   Together this means that all tools should natively be able to find the shared
   object and the shared object should be installed all the time for the various
   tools. Overall this should...
   
   Closes rust-lang#53813

   

   alexcrichton committed Sep 5, 2018
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