gcc runtime error in version 2.8.1 and 2.9.5

[llewelly@dbritsch.dsl.xmission.com]

This is a bug in your code, not a bug in gcc.

On Thu, 11 May 2000, Tom Warsinske wrote:

> Greetings,
> 
> The following test code produces a Segmentation Fault when compiled with
> gcc 2.8.1 on Solaris 2.5.1 and with gcc 2.9.5 on Solaris 2.7.  The
> program executes correctly when compiled with Sun's cc: WorkShop
> Compilers 4.2 30 Oct 1996 C 4.2 on Solaris 2.5.1.  Here is the test
> program --
> ++++++++++++++++++++++++
> #include <stdio.h>
> #include <strings.h>
> 
> char *rtrim(char *, char );
> 
> int main() {
>         char *lname = "MOUSExxxx";

String literals are of type char const*const, meaning one is not allowed
  to change the characters in the string.

>         char *fname = "MICKEY   ";
> 
>         lname = rtrim(lname,'x');
>         printf("%s \n",lname);
> }
> char *rtrim(char *str1, char c) {
>         char *s;
> 
>         printf("%s \n",str1);
>         s = index(str1, c);
>         printf("%s \n",s);
>         *s = '\0';        <= causes segmentation fault

Modifying a string literal is undefined.

>         return(str1);
> }
> 

If you really need to do this, look up the switch -fwritable-strings at
  http://gcc.gnu.org/onlinedocs/gcc_2.html#SEC6 .


Thank you for your bug report.
[snip]