[Bug preprocessor/30246] New: ggdb3 information lost using temporary preprocessed file ?

["sb7206 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Hello,

Objects generated using '-ggdb3' are different if the compilation process is
split in 2 steps (preprocessing and then compilation) or not.

The issue can be reproduced for the following 'main.c' code using the commands
'gcc -ggdb3 -c main.c' and 'gcc -ggdb3 -c main.c -E > main.i; gcc
-ggdb3 -c main.i'.

The resulting sizes are respectively 15400 and 3992 bytes. Using
'-ggdb2' the generated objects are the same. I guess some debugging
information is lost when the compilation process is split into two steps but as
 anyway the macro information generated using 'ggdb3' is not usable with gcc
3.4.5 I did not investigated.
Does anybody know if this is the expected behavior or if it is a bug?
Does a workaround exist?

Thanks in advance and best regards,
Serge

PS: we use gcc 3.4.5 on a Linux/Suse Linux Enterprise Server 9 but the
behavior is the same on Solaris 10 (same gcc version).

The main.c code:
#include <stdio.h>
int main(int argc, char **argv)
{
 printf("Hello\n");
 return 0;
}


-- 
           Summary: ggdb3 information lost using temporary preprocessed file
                    ?
           Product: gcc
           Version: 3.4.5
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sb7206 at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30246