c/640: Code generated for simultaneous debugging and profiling with basic blocks segfaults on Linux

[feliks at solidum dot com]

>Number:         640
>Category:       c
>Synopsis:       Code generated for simultaneous debugging and profiling with basic blocks segfaults on Linux
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 14 19:56:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Feliks J. Welfeld, Solidum Systems Corp
>Release:        2.95.1
>Organization:
>Environment:
linux, i386
>Description:
When one asks for both stabs debug info and profiling 
with basic blocks, and the initialized global data
are at the end of the source file, some data structures
generated by the compiler for the benefit of the
basic blocks profiling are placed in the .text
section instead in the .data section, and the
resulting executable segfaults upon entry to the
first function from such source file.
>How-To-Repeat:
/******************************************************************
 *
 * This program, when compiled / linked as below
 *
 *  /tools/cross/linux/gcc-2.95.1/bin/gcc -g -pg -a -o bad.exe bad.c
 *
 * causes segmentation fault in __bb_init_func.
 * If the global initialized data at the end of the file
 * are removed, or moved before the last function, it runs
 * just fine. Also, it runs just fine as is when
 * compiled with egcs-2.91.66.
 *
 ******************************************************************/

#include <stdio.h>

static void func( void );

int main( /*  Returns: zero on success or positive int error code */
         int     argc,     /* argument count  */
         char  **argv      /* arguments vector */
         ) 
{
  
  func();
  return( 0 );
}

static void func( void )
{
  printf( "Hello, world!\n" );
}

int globalDatum = 5;

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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