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Apply compiler-rt fix for building with earlier versions of clang

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Merge commit 18efa420da5f from llvm git (by Brooks Davis)

  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

MFC after:	3 days
This commit is contained in:
Dimitry Andric 2022-06-01 20:29:15 +02:00
parent 034667f9fa
commit cfefd16d57
1 changed files with 3 additions and 0 deletions
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contrib/llvm-project/compiler-rt/lib/builtins/atomic.c
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@ -363,6 +363,9 @@ OPTIMISED_CASES
#define OPTIMISED_CASE(n, lockfree, type) ATOMIC_RMW(n, lockfree, type, xor, ^)
OPTIMISED_CASES
#undef OPTIMISED_CASE
// Allow build with clang without __c11_atomic_fetch_nand builtin (pre-14)
#if __has_builtin(__c11_atomic_fetch_nand)
#define OPTIMISED_CASE(n, lockfree, type) ATOMIC_RMW_NAND(n, lockfree, type)
OPTIMISED_CASES
#undef OPTIMISED_CASE
#endif