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[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

llvm-svn: 227480
This commit is contained in:
Ulrich Weigand 2015-01-29 19:08:51 +00:00
parent d5bb7e142b
commit f32a1acee8
2 changed files with 9 additions and 0 deletions
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7
clang/lib/Driver/Tools.cpp
View File

@ -7515,6 +7515,13 @@ void gnutools::Link::ConstructJob(Compilation &C, const JobAction &JA,
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());

2
clang/test/Driver/ppc-features.cpp
View File

@ -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"