Use the Itanium ABI for thread_local on Darwin.
After some discussion, it was decided to use the Itanium ABI for thread_local on
Darwin OS X platforms. This involved a couple of changes. First, we use
"_tlv_atexit" instead of "__cxa_thread_atexit". Secondly, the global variables
are marked with 'internal' linkage, because we want all access to be calls to
the Itanium-specific entry point, which has normal linkage.
<rdar://problem/13733006>
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180941 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index bf67bd1..66c3983 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -1916,7 +1916,13 @@
!D->getAttr<WeakImportAttr>()) {
// Thread local vars aren't considered common linkage.
return llvm::GlobalVariable::CommonLinkage;
- }
+ } else if (D->getTLSKind() == VarDecl::TLS_Dynamic &&
+ getTarget().getTriple().isMacOSX())
+ // On Darwin, the backing variable for a C++11 thread_local variable always
+ // has internal linkage; all accesses should just be calls to the
+ // Itanium-specified entry point, which has the normal linkage of the
+ // variable.
+ return llvm::GlobalValue::InternalLinkage;
return llvm::GlobalVariable::ExternalLinkage;
}