Emit the TLS intialization functions into a list.

Add the TLS initialization functions to a list of initialization functions. The
back-end takes this list and places the function pointers into the correct
section. This way they're called before `main().'

<rdar://problem/13733006>

llvm-svn: 180739

1 files changed, 21 insertions, 0 deletions

diff --git a/clang/test/CodeGenCXX/tls-init-funcs.cpp b/clang/test/CodeGenCXX/tls-init-funcs.cpp
new file mode 100644
index 00000000000..79b0ea43191
--- /dev/null
+++ b/clang/test/CodeGenCXX/tls-init-funcs.cpp
@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin11 -std=c++11 -S -emit-llvm %s -o - | FileCheck -check-prefix=BITCODE %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin11 -std=c++11 -S %s -o - | FileCheck -check-prefix=ASM %s
+
+// BITCODE: @llvm.tls_init_funcs = appending global [1 x void ()*] [void ()* @__tls_init]
+
+struct A {
+  A();
+};
+
+struct B {
+  int i;
+  B(int i);
+};
+
+thread_local int i = 37;
+thread_local A a;
+thread_local B b(927);
+
+// ASM: .section __DATA,__thread_init,thread_local_init_function_pointers
+// ASM: .align 3
+// ASM: .quad ___tls_init