[all-commits] [llvm/llvm-project] 866922: [compiler-rt] Allow building builtins.a without a ...

[Jon Chesterfield via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 86692258637549ed9f863c3d2ba47b49f61bbc1f
      https://github.com/llvm/llvm-project/commit/86692258637549ed9f863c3d2ba47b49f61bbc1f
  Author: Jon Chesterfield <jonathanchesterfield at gmail.com>
  Date:   2024-03-26 (Tue, 26 Mar 2024)

  Changed paths:
    M compiler-rt/cmake/config-ix.cmake

  Log Message:
  -----------
  [compiler-rt] Allow building builtins.a without a libc (#86737)

compiler-rt may depend on libc (memset etc). Likewise a libc built by
clang may depend on compiler-rt builtins.

This circular dependency doesn't matter much once they're both compiled.
The easy compilation order to build both from source is:

1. install libc headers somewhere
2. build compiler-rt builtins against those headers
3. build libc against compiler-rt builtins

This patch relaxes the cmake sanity check to pass without requiring a
libc library. That allows the above sequence to work. Otherwise one
needs to build a static libc, then use that to pass the compiler-rt
cmake check, then build a normal libc.



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