forked from OSchip/llvm-project
337d5aa58f
r235046 turned "extern __declspec(selectany) int a;" from a declaration into
a definition to fix PR23242 (required for compatibility with mc.exe output).
However, this broke parsing Windows headers: A d3d11 headers contain something
like
struct SomeStruct {};
extern const __declspec(selectany) SomeStruct some_struct;
This is now a definition, and const objects either need an explicit default
ctor or an initializer so this errors out with
d3d11.h(1065,48) :
error: default initialization of an object of const type
'const CD3D11_DEFAULT' without a user-provided default constructor
(cl.exe just doesn't implement this rule, independent of selectany.)
To work around this, weaken this error into a warning for selectany decls
in microsoft mode, and recover with zero-initialization.
Doing this is a bit hairy since it adds a fixit on an error emitted
by InitializationSequence – this means it needs to build a correct AST, which
in turn means InitializationSequence::Failed() cannot return true when this
fixit is applied. As a workaround, the patch adds a fixit member to
InitializationSequence, and InitializationSequence::Perform() prints the
diagnostic if the fixit member is set right after its call to Diagnose.
That function is usually called when InitializationSequences are used –
InitListChecker::PerformEmptyInit() doesn't call it, but the InitListChecker
case never performs default-initialization, so this is technically OK.
This is the alternative, original fix for PR20208 that got reviewed in the
thread "[patch] Improve diagnostic on default-initializing const variables
(PR20208)". This change basically reverts r213725, adds the original fix for
PR20208, and makes the error a warning in Microsoft mode.
llvm-svn: 235166
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|---|---|---|
| .. | ||
| AnalysisBasedWarnings.cpp | ||
| AttributeList.cpp | ||
| CMakeLists.txt | ||
| CodeCompleteConsumer.cpp | ||
| DeclSpec.cpp | ||
| DelayedDiagnostic.cpp | ||
| IdentifierResolver.cpp | ||
| JumpDiagnostics.cpp | ||
| Makefile | ||
| MultiplexExternalSemaSource.cpp | ||
| Scope.cpp | ||
| ScopeInfo.cpp | ||
| Sema.cpp | ||
| SemaAccess.cpp | ||
| SemaAttr.cpp | ||
| SemaCUDA.cpp | ||
| SemaCXXScopeSpec.cpp | ||
| SemaCast.cpp | ||
| SemaChecking.cpp | ||
| SemaCodeComplete.cpp | ||
| SemaConsumer.cpp | ||
| SemaDecl.cpp | ||
| SemaDeclAttr.cpp | ||
| SemaDeclCXX.cpp | ||
| SemaDeclObjC.cpp | ||
| SemaExceptionSpec.cpp | ||
| SemaExpr.cpp | ||
| SemaExprCXX.cpp | ||
| SemaExprMember.cpp | ||
| SemaExprObjC.cpp | ||
| SemaFixItUtils.cpp | ||
| SemaInit.cpp | ||
| SemaLambda.cpp | ||
| SemaLookup.cpp | ||
| SemaObjCProperty.cpp | ||
| SemaOpenMP.cpp | ||
| SemaOverload.cpp | ||
| SemaPseudoObject.cpp | ||
| SemaStmt.cpp | ||
| SemaStmtAsm.cpp | ||
| SemaStmtAttr.cpp | ||
| SemaTemplate.cpp | ||
| SemaTemplateDeduction.cpp | ||
| SemaTemplateInstantiate.cpp | ||
| SemaTemplateInstantiateDecl.cpp | ||
| SemaTemplateVariadic.cpp | ||
| SemaType.cpp | ||
| TreeTransform.h | ||
| TypeLocBuilder.cpp | ||
| TypeLocBuilder.h | ||