[all-commits] [llvm/llvm-project] 311f78: [CMake] Enable LLVM_ENABLE_PER_TARGET_RUNTIME_DIR ...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 311f7839602344ca347816146edb68c0ffaaa060
      https://github.com/llvm/llvm-project/commit/311f7839602344ca347816146edb68c0ffaaa060
  Author: Fangrui Song <i at maskray.me>
  Date:   2022-06-07 (Tue, 07 Jun 2022)

  Changed paths:
    M llvm/CMakeLists.txt

  Log Message:
  -----------
  [CMake] Enable LLVM_ENABLE_PER_TARGET_RUNTIME_DIR by default on Linux

This makes the LLVM_ENABLE_PROJECTS mode (supported for compiler-rt, deprecated
(D112724) for libcxx/libcxxabi/libunwind) closer to
https://libcxx.llvm.org/BuildingLibcxx.html#bootstrapping-build .
The layout is arguably superior because different libraries of target triples
are in different directories, similar to GCC/Debian multiarch.

When LLVM_DEFAULT_TARGET_TRIPLE is x86_64-unknown-linux-gnu,
`lib/clang/15.0.0/lib/libclang_rt.asan-x86_64.a`
is moved to
`lib/clang/15.0.0/lib/x86_64-unknown-linux-gnu/libclang_rt.asan.a`.

In addition, if the host compiler supports -m32 (multilib),
`lib/clang/15.0.0/lib/libclang_rt.asan-i386.a`
is moved to
`lib/clang/15.0.0/lib/i386-unknown-linux-gnu/libclang_rt.asan.a`.

Reviewed By: mstorsjo, ldionne, #libc

Differential Revision: https://reviews.llvm.org/D107799