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Give explicit template instantiations weak linkage (but don't defer

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them). Fixes PR6578.

llvm-svn: 98328
This commit is contained in:
Douglas Gregor
2010-03-12 04:49:06 +00:00
parent b8b94668b6
commit ee3f72299c
10 changed files with 39 additions and 36 deletions
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18
clang/lib/CodeGen/CodeGenModule.cpp
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@@ -285,8 +285,7 @@ GetLinkageForFunction(ASTContext &Context, const FunctionDecl *FD,
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 @@ CodeGenModule::getFunctionLinkage(const FunctionDecl *D) {
// 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 @@ bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
// 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 @@ GetLinkageForVariable(ASTContext &Context, const VarDecl *VD) {
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 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
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() &&