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[MSVC] Fix check for wchar_t type in case of -fno-wchar 

The example below should work identically with and without compiler native
wchar_t support.

void foo(wchar_t * t = L"");

Differential Revision: http://reviews.llvm.org/D19056

llvm-svn: 266287
This commit is contained in:
Dmitry Polukhin 2016-04-14 09:52:06 +00:00
parent a212c58db0
commit 9d64f72640
2 changed files with 23 additions and 1 deletions
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3
clang/lib/Sema/SemaExprCXX.cpp
View File

@ -3040,7 +3040,8 @@ Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
return (ToPointeeType->getKind() == BuiltinType::Char_U || return (ToPointeeType->getKind() == BuiltinType::Char_U ||
ToPointeeType->getKind() == BuiltinType::Char_S); ToPointeeType->getKind() == BuiltinType::Char_S);
case StringLiteral::Wide: case StringLiteral::Wide:
return ToPointeeType->isWideCharType(); return Context.typesAreCompatible(Context.getWideCharType(),
QualType(ToPointeeType, 0));
} }
} }
} }

21
clang/test/SemaCXX/no-wchar.cpp
View File

@ -7,3 +7,24 @@ void foo(const wchar_t* x);
void bar() { void bar() {
foo(L"wide string literal"); foo(L"wide string literal");
} }
void foo1(wchar_t * t = L"");
// expected-warning@-1 {{conversion from string literal to 'wchar_t *' (aka 'unsigned short *') is deprecated}}
short *a = L"";
// expected-error@-1 {{cannot initialize a variable of type 'short *' with an lvalue of type 'const unsigned short [1]'}}
char *b = L"";
// expected-error@-1 {{cannot initialize a variable of type 'char *' with an lvalue of type 'const unsigned short [1]'}}
// NOTE: MSVC allows deprecated conversion in conditional expression if at least
// one of the operand is a string literal but Clang doesn't allow it.
wchar_t *c = true ? L"a" : L"";
// expected-error@-1 {{cannot initialize a variable of type 'wchar_t *' (aka 'unsigned short *') with}}
const wchar_t *d1 = 0;
const wchar_t *d2 = 0;
wchar_t *d = true ? d1 : d2;
// expected-error@-1 {{cannot initialize a variable of type 'wchar_t *' (aka 'unsigned short *') with}}
wchar_t* e = (const wchar_t*)L"";
// expected-error@-1 {{cannot initialize a variable of type 'wchar_t *' (aka 'unsigned short *') with an rvalue of type 'const wchar_t *' (aka 'const unsigned short *')}}