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Tweak warning text for returning incomplete type from extern "C" functions. 

A warning was added in r150128 for returning non-C compatible
user-defined types from functions with C linkage.

This makes the text more clear for the case when the type isn't
decidedly non-C compatible, but incomplete.

llvm-svn: 160681
This commit is contained in:
Hans Wennborg 2012-07-24 17:59:41 +00:00
parent 0a36302ae0
commit 84ce606b91
3 changed files with 10 additions and 4 deletions
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3
clang/include/clang/Basic/DiagnosticSemaKinds.td
View File

@ -192,6 +192,9 @@ def warn_return_value_size: Warning<
def warn_return_value_udt: Warning<
"%0 has C-linkage specified, but returns user-defined type %1 which is "
"incompatible with C">, InGroup<ReturnTypeCLinkage>;
def warn_return_value_udt_incomplete: Warning<
"%0 has C-linkage specified, but returns incomplete type %1 which could be "
"incompatible with C">, InGroup<ReturnTypeCLinkage>;
def warn_implicit_function_decl : Warning<
"implicit declaration of function %0">,
InGroup<ImplicitFunctionDeclare>, DefaultIgnore;

9
clang/lib/Sema/SemaDecl.cpp
View File

@ -6086,10 +6086,11 @@ bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
// compatible, and if it does, warn the user.
if (NewFD->isExternC()) {
QualType R = NewFD->getResultType();
if (!R.isPODType(Context) &&
!R->isVoidType())
Diag( NewFD->getLocation(), diag::warn_return_value_udt )
<< NewFD << R;
if (R->isIncompleteType() && !R->isVoidType())
Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete)
<< NewFD << R;
else if (!R.isPODType(Context) && !R->isVoidType())
Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R;
}
}
return Redeclaration;

2
clang/test/SemaCXX/function-extern-c.cpp
View File

@ -36,3 +36,5 @@ extern "C" void f7( U u );
extern "C" double f8(void);
extern "C" long long f11( void );
extern "C" A *f10( void );
extern "C" struct mypodstruct f12(); // expected-warning {{'f12' has C-linkage specified, but returns incomplete type 'struct mypodstruct' which could be incompatible with C}}