Pass --wrap=pthread_create to linker for -fsplit-stack.

From

https://gcc.gnu.org/ml/gcc-patches/2010-09/msg01807.html

-fsplit-stack should pass --wrap=pthread_create to linker for -fsplit-stack
It is needed to initialize the stack guard.  This fixes PR 20148.

Patch by H.J Lu!

llvm-svn: 258698

2 files changed, 20 insertions, 0 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 6a1517f1807..574bf5cd77d 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -9001,6 +9001,9 @@ void gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       if (WantPthread && !isAndroid)
         CmdArgs.push_back("-lpthread");
 
+      if (Args.hasArg(options::OPT_fsplit_stack))
+        CmdArgs.push_back("--wrap=pthread_create");
+
       CmdArgs.push_back("-lc");
 
       if (Args.hasArg(options::OPT_static))
diff --git a/clang/test/Driver/split-stack-ld.c b/clang/test/Driver/split-stack-ld.c
new file mode 100644
index 00000000000..3441d542cb8
--- /dev/null
+++ b/clang/test/Driver/split-stack-ld.c
@@ -0,0 +1,17 @@
+// Test split stack ld flags.
+//
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     -target i386-unknown-linux -fsplit-stack \
+// RUN:     -resource-dir=%S/Inputs/resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-LINUX-I386 %s
+//
+// CHECK-LINUX-I386: "--wrap=pthread_create"
+//
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     -target x86_64-unknown-linux -fsplit-stack \
+// RUN:     -resource-dir=%S/Inputs/resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-LINUX-X86-64 %s
+//
+// CHECK-LINUX-X86-64: "--wrap=pthread_create"