[all-commits] [llvm/llvm-project] 18efa4: compiler-rt: Allow build without __c11_atomic_fetc...

[Brooks Davis via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 18efa420da5fa065d88ba451cdcdbd950a2090c1
      https://github.com/llvm/llvm-project/commit/18efa420da5fa065d88ba451cdcdbd950a2090c1
  Author: Brooks Davis <brooks at FreeBSD.org>
  Date:   2022-06-01 (Wed, 01 Jun 2022)

  Changed paths:
    M compiler-rt/lib/builtins/atomic.c

  Log Message:
  -----------
  compiler-rt: Allow build without __c11_atomic_fetch_nand

Don't build atomic fetch nand libcall functions when the required
compiler builtin isn't available. Without this compiler-rt can't be
built with LLVM 13 or earlier.

Not building the libcall functions isn't optimal, but aligns with the
usecase in FreeBSD where compiler-rt from LLVM 14 is built with an LLVM
13 clang and no LLVM 14 clang is built.

Reviewed By:	efriedma

Differential Revision:	https://reviews.llvm.org/D126710