Revert "[OPENMP] Fix PR38026: Link -latomic when -fopenmp is used."
This reverts commit r336467: libatomic is not available on all Linux
systems and this commit completely breaks OpenMP on them, even if there
are no atomic operations or all of them can be lowered to hardware
instructions.
See http://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20180716/234816.html
for post-commit discussion.
llvm-svn: 337722
diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
index ee30968..1ecf127 100644
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -479,7 +479,6 @@
bool WantPthread = Args.hasArg(options::OPT_pthread) ||
Args.hasArg(options::OPT_pthreads);
- bool WantAtomic = false;
// FIXME: Only pass GompNeedsRT = true for platforms with libgomp that
// require librt. Most modern Linux platforms do, but some may not.
@@ -488,16 +487,13 @@
/* GompNeedsRT= */ true))
// OpenMP runtimes implies pthreads when using the GNU toolchain.
// FIXME: Does this really make sense for all GNU toolchains?
- WantAtomic = WantPthread = true;
+ WantPthread = true;
AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
if (WantPthread && !isAndroid)
CmdArgs.push_back("-lpthread");
- if (WantAtomic)
- CmdArgs.push_back("-latomic");
-
if (Args.hasArg(options::OPT_fsplit_stack))
CmdArgs.push_back("--wrap=pthread_create");