http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47231
Summary: Commas inside ObjC method invocation can confuse
compiler
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: objc
AssignedTo: [email protected]
ReportedBy: [email protected]
GCC accepts the invalid code
[receiver firstArgument: a, b secondArgument: c];
and seems to (mis)compile it as if
[receiver firstArgument:a secondArgument: b];
had been typed.
This is not a regression; it seems that GCC has always behaved like that (which
also suggests it's not such a high priority since nobody ever noticed or
reported it; presumably few people accidentally put commas in there).
I tried out clang 2.8, and it rejects the invalid syntax; we should improve
GCC to reject it too! ;-)
Here is a more complete testcase, with the lines that have undetected syntax
errors marked --
/* Contributed by Nicola Pero <[email protected]>, January 2011.
*/
/* { dg-do compile } */
@interface MyClass
- (void) method: (id)x;
- (void) method2: (id)x : (id)y;
@end
void test (MyClass *o)
{
[o method:]; /* { dg-error "syntax error" } */
[o method: o]; /* Ok */
[o method: o, o]; /* { dg-error "too many arguments" } */
[o method2::]; /* { dg-error "syntax error" } */
[o method2: o :]; /* { dg-error "syntax error" } */
[o method2: o, o :]; /* { dg-error "syntax error" } */
[o method2: o, o :o]; /* { dg-error "too many arguments" } */ /* Missing
error */
[o method2: o :o]; /* Ok */
[o method2: o, o :o, o]; /* { dg-error "too many arguments" } */ /* Missing
error */
[o method2: o :o, o]; /* { dg-error "too many arguments" } */
}
Thanks
