r227480 - [PowerPC] Work around TLS linker bug

[Ulrich Weigand]

Author: uweigand
Date: Thu Jan 29 13:08:51 2015
New Revision: 227480

URL: http://llvm.org/viewvc/llvm-project?rev=227480&view=rev
Log:
[PowerPC] Work around TLS linker bug

Work around a bug in GNU ld (and gold) linker versions up to 2.25
that may mis-optimize code generated by this version of clang/LLVM
to access general-dynamic or local-dynamic TLS variables.

Bug is fixed here:
https://sourceware.org/ml/binutils/2015-01/msg00318.html


Modified:
    cfe/trunk/lib/Driver/Tools.cpp
    cfe/trunk/test/Driver/ppc-features.cpp

Modified: cfe/trunk/lib/Driver/Tools.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=227480&r1=227479&r2=227480&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/Tools.cpp (original)
+++ cfe/trunk/lib/Driver/Tools.cpp Thu Jan 29 13:08:51 2015
@@ -7515,6 +7515,13 @@ void gnutools::Link::ConstructJob(Compil
         D.DyldPrefix + getLinuxDynamicLinker(Args, ToolChain)));
   }
 
+  // Work around a bug in GNU ld (and gold) linker versions up to 2.25
+  // that may mis-optimize code generated by this version of clang/LLVM
+  // to access general-dynamic or local-dynamic TLS variables.
+  if (ToolChain.getArch() == llvm::Triple::ppc64 ||
+      ToolChain.getArch() == llvm::Triple::ppc64le)
+    CmdArgs.push_back("--no-tls-optimize");
+
   CmdArgs.push_back("-o");
   CmdArgs.push_back(Output.getFilename());
 

Modified: cfe/trunk/test/Driver/ppc-features.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/ppc-features.cpp?rev=227480&r1=227479&r2=227480&view=diff
==============================================================================
--- cfe/trunk/test/Driver/ppc-features.cpp (original)
+++ cfe/trunk/test/Driver/ppc-features.cpp Thu Jan 29 13:08:51 2015
@@ -132,8 +132,10 @@
 // linker features
 // RUN: %clang -target powerpc64-unknown-linux-gnu %s -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK_BE_LD_ARGS %s
 // CHECK_BE_LD_ARGS: "elf64ppc"
+// CHECK_BE_LD_ARGS: "--no-tls-optimize"
 
 // RUN: %clang -target powerpc64le-unknown-linux-gnu %s -### -o %t.o 2>&1 | FileCheck -check-prefix=CHECK_LE_LD_ARGS %s
 // CHECK_LE_LD_ARGS: "elf64lppc"
+// CHECK_LE_LD_ARGS: "--no-tls-optimize"