[lld] r248193 - COFF: Do not call std::async with std::launch::async if multithreading is disabled.

[Rui Ueyama via llvm-commits]

Author: ruiu
Date: Mon Sep 21 14:12:36 2015
New Revision: 248193

URL: http://llvm.org/viewvc/llvm-project?rev=248193&view=rev
Log:
COFF: Do not call std::async with std::launch::async if multithreading is disabled.

Modified:
    lld/trunk/COFF/SymbolTable.cpp

Modified: lld/trunk/COFF/SymbolTable.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/COFF/SymbolTable.cpp?rev=248193&r1=248192&r2=248193&view=diff
==============================================================================
--- lld/trunk/COFF/SymbolTable.cpp (original)
+++ lld/trunk/COFF/SymbolTable.cpp Mon Sep 21 14:12:36 2015
@@ -24,15 +24,21 @@ namespace lld {
 namespace coff {
 
 void SymbolTable::addFile(std::unique_ptr<InputFile> FileP) {
+#if LLVM_ENABLE_THREADS
+  std::launch Policy = std::launch::async;
+#else
+  std::launch Policy = std::launch::deferred;
+#endif
+
   InputFile *File = FileP.get();
   Files.push_back(std::move(FileP));
   if (auto *F = dyn_cast<ArchiveFile>(File)) {
     ArchiveQueue.push_back(
-        std::async(std::launch::async, [=]() { F->parse(); return F; }));
+        std::async(Policy, [=]() { F->parse(); return F; }));
     return;
   }
   ObjectQueue.push_back(
-      std::async(std::launch::async, [=]() { File->parse(); return File; }));
+      std::async(Policy, [=]() { File->parse(); return File; }));
   if (auto *F = dyn_cast<ObjectFile>(File)) {
     ObjectFiles.push_back(F);
   } else if (auto *F = dyn_cast<BitcodeFile>(File)) {