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Allow the parser to recover gracefully if a typename is used to introduce a decltype type. 

In Microsoft mode, we emit a warning instead of an error.

This fixes a couple of errors when parsing the MSVC 11 RC headers with clang.

llvm-svn: 160613
This commit is contained in:
Francois Pichet 2012-07-22 15:10:57 +00:00
parent 0e2b84312f
commit f5b24e0136
2 changed files with 7 additions and 3 deletions
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8
clang/lib/Parse/Parser.cpp
View File

@ -1334,10 +1334,12 @@ bool Parser::TryAnnotateTypeOrScopeToken(bool EnteringContext, bool NeedType) {
0, /*IsTypename*/true))
return true;
if (!SS.isSet()) {
if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id)) {
if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
Tok.is(tok::annot_decltype)) {
// Attempt to recover by skipping the invalid 'typename'
if (!TryAnnotateTypeOrScopeToken(EnteringContext, NeedType) &&
Tok.isAnnotation()) {
if (Tok.is(tok::annot_decltype) ||
(!TryAnnotateTypeOrScopeToken(EnteringContext, NeedType) &&
Tok.isAnnotation())) {
unsigned DiagID = diag::err_expected_qualified_after_typename;
// MS compatibility: MSVC permits using known types with typename.
// e.g. "typedef typename T* pointer_type"

2
clang/test/SemaCXX/MicrosoftCompatibility.cpp
View File

@ -4,6 +4,8 @@
typedef unsigned short char16_t;
typedef unsigned int char32_t;
typename decltype(3) a; // expected-warning {{expected a qualified name after 'typename'}}
namespace ms_conversion_rules {
void f(float a);