[Bug preprocessor/16903] New: __LINE__ is not implemented in preprocessor

["whitis at freelabs dot com" <gcc-bugzilla at gcc dot gnu dot org>]

__LINE__ appears to be implemented in the parser, with an effect similar to
   const int __LINE__ = 57;
Instead of at preprocessor time, where it would behave similarly to:
   #define __LINE__ 57
This means you cannot use __LINE__ to build a unique variable name in
a preprocessor macro.

#define BANK30 __attribute__((section("bank30")))
#define xxxprintf(fmt,...) { static char BANK30 fmt_ ## __LINE__[] = fmt; 
printf(copy_format(fmt_ ## __LINE__), ##__VA_ARGS__); }
xxxprintf("hello, world\n");

This should have produced a variable named something linke fmt_57.
This arrose when trying to work around other gcc limitations (the inability
to specify a memory section on a string literal.

Fortunately, in this case, the enclosing braces should allow one to use a
non-unique name.

-- 
           Summary: __LINE__ is not implemented in preprocessor
           Product: gcc
           Version: 3.2.2
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: preprocessor
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: whitis at freelabs dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16903