[Bug c/17638] New: gcc fails compilation with incorrect error

[rstewart at xvdcorp dot com]

gcc fails to compile the following file and gives an error message of
"junk.c:22:1: pasting ";" and "return" does not give a valid preprocessing token".

The compiler (actually probably the preprocessor) appears to be complaining
about a perfectly legal macro.  If fact, if the macro substitution is manually
performed by "cutting" and "pasting" the preprocessed file's (saved by using the
-E command line option and directing stdout to a file) generated code instead of
using the macro the file compiles and executes as expected.

The command line used to compile the source file is "gcc -g -O0 junk.c"

The source file is:

#include        <stdio.h>

#define ASSERT(expr, func) \
        if(!(expr)) { \
                printf( "Assertion failed! %s,%s,%s,line=%d\n", \
                        #expr,__FILE__,__FUNCTION__,__LINE__); \
                        ##func }

static int sub_func( char * );

main()
{
        int     temp;

        temp = sub_func( NULL );
        printf( "sub_func() returned: %d\n", temp );
        exit( 0 );
}

static int sub_func( char * task )
{
        ASSERT(task != NULL, return(-1););
        return( 0 );
}

-- 
           Summary: gcc fails compilation with incorrect error
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rstewart at xvdcorp dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17638