[all-commits] [llvm/llvm-project] ced725: [libsupport] Silence a bogus valgrind warning.

[Chris Lattner via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ced7256778699639d37cfa70ff65b4fcbdf62ebc
      https://github.com/llvm/llvm-project/commit/ced7256778699639d37cfa70ff65b4fcbdf62ebc
  Author: Chris Lattner <clattner at nondot.org>
  Date:   2021-03-18 (Thu, 18 Mar 2021)

  Changed paths:
    M llvm/lib/Support/Unix/Process.inc

  Log Message:
  -----------
  [libsupport] Silence a bogus valgrind warning.

Valgrind is reporting this bogus warning because it doesn't model
pthread_sigmask fully accurately.  This is a valgrind bug, but
silencing it has effectively no cost, so just do it.

==73662== Syscall param __pthread_sigmask(set) points to uninitialised byte(s)
==73662==    at 0x101E9D4C2: __pthread_sigmask (in /usr/lib/system/libsystem_kernel.dylib)
==73662==    by 0x101EFB5EA: pthread_sigmask (in /usr/lib/system/libsystem_pthread.dylib)
==73662==    by 0x1000D9F6D: llvm::sys::Process::SafelyCloseFileDescriptor(int) (in /Users/chrisl/Projects/circt/build/bin/firtool)
==73662==    by 0x100072795: llvm::ErrorOr<std::__1::unique_ptr<llvm::MemoryBuffer, std::__1::default_delete<llvm::MemoryBuffer> > > getFileAux<llvm::MemoryBuffer>(llvm::Twine const&, long long, unsigned long long, unsigned long long, bool, bool) (in /Users/chrisl/Projects/circt/build/bin/firtool)
==73662==    by 0x100072573: llvm::MemoryBuffer::getFileOrSTDIN(llvm::Twine const&, long long, bool) (in /Users/chrisl/Projects/circt/build/bin/firtool)
==73662==    by 0x100282C25: mlir::openInputFile(llvm::StringRef, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*) (in /Users/chrisl/Projects/circt/build/bin

Differential Revision: https://reviews.llvm.org/D98830