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[clang] Update comments on another libstdc++ HACK 

Document relevant gcc versions and dates.

Differential Revision: https://reviews.llvm.org/D101530
This commit is contained in:
Nathan Sidwell 2021-04-29 06:20:54 -07:00
parent 8989268dae
commit e90792d8c7
1 changed files with 5 additions and 4 deletions
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9
clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
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@ -856,10 +856,11 @@ Decl *TemplateDeclInstantiator::InstantiateTypedefNameDecl(TypedefNameDecl *D,
SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType());
}
// HACK: g++ has a bug where it gets the value kind of ?: wrong.
// libstdc++ relies upon this bug in its implementation of common_type.
// If we happen to be processing that implementation, fake up the g++ ?:
// semantics. See LWG issue 2141 for more information on the bug.
// HACK: 2012-10-23 g++ has a bug where it gets the value kind of ?: wrong.
// libstdc++ relies upon this bug in its implementation of common_type. If we
// happen to be processing that implementation, fake up the g++ ?:
// semantics. See LWG issue 2141 for more information on the bug. The bugs
// are fixed in g++ and libstdc++ 4.9.0 (2014-04-22).
const DecltypeType *DT = DI->getType()->getAs<DecltypeType>();
CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
if (DT && RD && isa<ConditionalOperator>(DT->getUnderlyingExpr()) &&