Debian bug report logs - #1309
Problems with Debian: gcc or glib

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From core.ucl.ac.be!jpp Mon Sep  4 01:29:13 1995
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To: debian-bugs@pixar.com
Subject: Bug#1309 in not produced if compiler optimizes
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Date: Mon, 04 Sep 1995 10:29:18 +0200
From: Joao Pedro PEDROSO <jpp@core.ucl.ac.be>

I realized that the bug is not produced if I compile with
optimization :-) :


[jpp]kaj69:~/C/testing $ cat test.c
#include <math.h>

main() {
  double j, k = 1.0;

  j = sin(k);

  printf("worked\n");
}
[jpp]kaj69:~/C/testing $ gcc -g test.c -lm
[jpp]kaj69:~/C/testing $ ./a.out
Segmentation fault
[jpp]kaj69:~/C/testing $ gcc -g -O test.c -lm
[jpp]kaj69:~/C/testing $ ./a.out 
worked
[jpp]kaj69:~/C/testing $ 


Cheers,

Joao Pedro PEDROSO		Universite Catholique de Louvain
				CORE - room b.140
jpp@core.ucl.ac.be		34 voie du Roman Pays
Tel: +32-10-474325		B-1348 Louvain-la-Neuve
Fax: +32-10-474301		BELGIUM
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From core.ucl.ac.be!jpp Sat Sep  2 06:53:02 1995
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To: debian-bugs@pixar.com
Subject: Problems with Debian: gcc or glib
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Date: Sat, 02 Sep 1995 15:53:24 +0200
From: Joao Pedro PEDROSO <jpp@core.ucl.ac.be>

Package: gcc
Version: 2.6.3-4

Package: libc
Version: 4.6.27-5

Package: binutils
Version: 2.5.2-3

Dear Debian'ers,

I've a problem with gcc/ld and libm. When I compile this program:
---   8< 8< 8<   ---	
/* file test.c */
#include <math.h>
main() {
  double j, k = 1.0;
  j = sin(k);
  printf("worked\n");
}
---   >8 >8 >8   ---	

with 'gcc test.c -lm', it works fine.  But if I try with 
'gcc -g test.c -lm', then I get a segmentation fault.
Needless to say, in other platforms gcc does not have this 
funny behavior ;-)...


When I try to debug the program compiled with '-g', using
gdb, I get:
---   8< 8< 8<   ---	
$ gdb a.out
(gdb) b 1
Breakpoint 1 at 0x1084: file test.c, line 1.
(gdb) run
Starting program: /home/jpp/C/testing/a.out 

Program received signal SIGSEGV, Segmentation fault.
0x62f0136e in end ()
(gdb) 
---   >8 >8 >8   ---	

I am using Debian 0.93R5, kernel version 1.2.13.

Thanks for any enlightenment,


Joao Pedro PEDROSO		Universite Catholique de Louvain
				CORE - room b.140
jpp@core.ucl.ac.be		34 voie du Roman Pays
Tel: +32-10-474325		B-1348 Louvain-la-Neuve
Fax: +32-10-474301		BELGIUM
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