Reinstate patch to turn explicit template instantiations into weak symbols
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@98424 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index c67948d..7314dae 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -285,8 +285,7 @@
break;
case TSK_ExplicitInstantiationDefinition:
- // FIXME: explicit instantiation definitions should use weak linkage
- return CodeGenModule::GVA_StrongExternal;
+ return CodeGenModule::GVA_ExplicitTemplateInstantiation;
case TSK_ExplicitInstantiationDeclaration:
case TSK_ImplicitInstantiation:
@@ -335,7 +334,8 @@
// In C99 mode, 'inline' functions are guaranteed to have a strong
// definition somewhere else, so we can use available_externally linkage.
return llvm::Function::AvailableExternallyLinkage;
- } else if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation) {
+ } else if (Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation ||
+ Linkage == GVA_ExplicitTemplateInstantiation) {
// In C++, the compiler has to emit a definition in every translation unit
// that references the function. We should use linkonce_odr because
// a) if all references in this translation unit are optimized away, we
@@ -589,6 +589,7 @@
// static, static inline, always_inline, and extern inline functions can
// always be deferred. Normal inline functions can be deferred in C99/C++.
+ // Implicit template instantiations can also be deferred in C++.
if (Linkage == GVA_Internal || Linkage == GVA_C99Inline ||
Linkage == GVA_CXXInline || Linkage == GVA_TemplateInstantiation)
return true;
@@ -1043,15 +1044,15 @@
switch (TSK) {
case TSK_Undeclared:
case TSK_ExplicitSpecialization:
-
- // FIXME: ExplicitInstantiationDefinition should be weak!
- case TSK_ExplicitInstantiationDefinition:
return CodeGenModule::GVA_StrongExternal;
-
+
case TSK_ExplicitInstantiationDeclaration:
llvm_unreachable("Variable should not be instantiated");
// Fall through to treat this like any other instantiation.
+ case TSK_ExplicitInstantiationDefinition:
+ return CodeGenModule::GVA_ExplicitTemplateInstantiation;
+
case TSK_ImplicitInstantiation:
return CodeGenModule::GVA_TemplateInstantiation;
}
@@ -1171,7 +1172,8 @@
GV->setLinkage(llvm::GlobalVariable::WeakODRLinkage);
else
GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
- } else if (Linkage == GVA_TemplateInstantiation)
+ } else if (Linkage == GVA_TemplateInstantiation ||
+ Linkage == GVA_ExplicitTemplateInstantiation)
GV->setLinkage(llvm::GlobalVariable::WeakAnyLinkage);
else if (!getLangOptions().CPlusPlus && !CodeGenOpts.NoCommon &&
!D->hasExternalStorage() && !D->getInit() &&