[cfe-dev] clang vs. gcc

[Douglas Gregor]

On Apr 29, 2009, at 4:12 AM, Filipe Cabecinhas wrote:

> Hi,
>
> clang doesn't compile the following code:
> ---------------------------
> [filcab at farnsworth ~] $ cat a.c
> #include <stdio.h>
>
> extern void a;
>
> int main ()
> {
>   printf("%p\n", &a);
>   return 0;
> }
> ---------------------------
>
> [filcab at farnsworth ~] $ gcc -c a.c
> [filcab at farnsworth ~] $ clang -c a.c
> a.c:7:18: error: address expression must be an lvalue or a function
> designator
>   printf("%p\n", &a);
>                  ^~
> 1 diagnostic generated.
>
> Should I file a bug report or is it intended?

Both! ;)

> If you want to know, it's
> from valgrind's source code. The symbol acts as a marker and is  
> defined
> in a .S file.


This isn't valid C89 or C99, but it's a GNU extension and it seems  
reasonable. Please file a bug report and we'll add it as a GNU  
extension.

	- Doug