[Bug c/15984] New: Different behavior of gcc when passing hard/variable argument

[Bug c/15984] New: Different behavior of gcc when passing hard/variable argument

[pierre-matthieu dot anglade at cea dot fr]

The code enclosed don't work with gcc. The second fonction call result in a
segmentation fault. It seems to be a bug. Compilers from unix vendors (all but
IBM) works fine on this. (please see below for arch details)

-------------------------------------------------------------------------
#include <string.h>
#include <stdio.h>

void cut (char *);

int
main(void)
{
  char str1[1000];
  
  sprintf(str1,"bv 10 12 14 13 345 56 56 xfg");
  cut(str1);
  cut("bv 10 12 14 13 345 56 56 xfg");

  return 0;
}

void
cut(char *str){
  char *token;
  
  //fprintf(stderr,"arg adress:%p\n",str);
  token = strtok(str,";, \t...whatever you want");
  do{    
    fprintf(stderr,"%s\n",token);
  }while( (char *)NULL != (token=strtok((char *)NULL,";, \t...whatever you want"
)));
    }
________________________________________________________________________________

It seems that gcc is using a different way for representation in memory of 
the argument str1 and the constant argument.



*ARCH:
  i686, sparc, power4, PA-RISC, alpha, MIPS, power3.
*GCC version:
  Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2/specs
  Configured with: ../configure --prefix=/usr --mandir=/usr/share/man  
--infodir=/usr/share/info --enable-shared --enable-threads=posix  
--disable-checking --host=i386-redhat-linux --with-system-zlib  
--enable-__cxa_atexit
  Thread model: posix
  gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)

ou:

  Reading specs from  
/usr/local/gnu/bin/../lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/specs
  Configured with: ../../../src/gcc-3.2.1/configure  
--prefix=/usr/local/rep/gcc-3.2.1  
--exec-prefix=/usr/local/rep/gcc-3.2.1/SunOS_5.8 --enable-languages=c++,f77,java
  Thread model: posix
  gcc version 3.2.1
ou: .... (down to v2.95 at least)

-- 
           Summary: Different behavior of gcc when passing hard/variable
                    argument
           Product: gcc
           Version: 3.2.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pierre-matthieu dot anglade at cea dot fr
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: gcc
  GCC host triplet: sparc/solaris
GCC target triplet: inluded in description


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15984

[Bug c/15984] Different behavior of gcc when passing hard/variable argument

[amodra at bigpond dot net dot au]

------- Additional Comments From amodra at bigpond dot net dot au  2004-06-14 12:23 -------
strtok modifies its first argument.  If you can't rewrite your buggy program,
-fwritable-strings might help.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15984