Replace std::call_once with llvm:call_once

Summary:
This is required on some platforms, as GNU libstdc++ std::call_once is known to be buggy.

This fixes operation of LLD on at least NetBSD and perhaps OpenBSD and Linux PowerPC.

The same change has been introduced to LLVM and LLDB.

Reviewers: ruiu

Reviewed By: ruiu

Subscribers: emaste, #lld

Tags: #lld

Differential Revision: https://reviews.llvm.org/D33508

llvm-svn: 303788

2 files changed, 4 insertions, 2 deletions

diff --git a/lld/ELF/InputSection.cpp b/lld/ELF/InputSection.cpp
index e8cfd21c4c4..bd96fdb3244 100644
--- a/lld/ELF/InputSection.cpp
+++ b/lld/ELF/InputSection.cpp
@@ -23,6 +23,7 @@
 #include "llvm/Support/Compression.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/Threading.h"
 #include <mutex>
 
 using namespace llvm;
@@ -866,7 +867,7 @@ const SectionPiece *MergeInputSection::getSectionPiece(uint64_t Offset) const {
 // it is not just an addition to a base output offset.
 uint64_t MergeInputSection::getOffset(uint64_t Offset) const {
   // Initialize OffsetMap lazily.
-  std::call_once(InitOffsetMap, [&] {
+  llvm::call_once(InitOffsetMap, [&] {
     OffsetMap.reserve(Pieces.size());
     for (const SectionPiece &Piece : Pieces)
       OffsetMap[Piece.InputOff] = Piece.OutputOff;
diff --git a/lld/ELF/InputSection.h b/lld/ELF/InputSection.h
index 303c398b58c..75174969c48 100644
--- a/lld/ELF/InputSection.h
+++ b/lld/ELF/InputSection.h
@@ -18,6 +18,7 @@
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/TinyPtrVector.h"
 #include "llvm/Object/ELF.h"
+#include "llvm/Support/Threading.h"
 #include <mutex>
 
 namespace lld {
@@ -248,7 +249,7 @@ private:
   std::vector<uint32_t> Hashes;
 
   mutable llvm::DenseMap<uint64_t, uint64_t> OffsetMap;
-  mutable std::once_flag InitOffsetMap;
+  mutable llvm::once_flag InitOffsetMap;
 
   llvm::DenseSet<uint64_t> LiveOffsets;
 };