Using GDB to debug a code compiled with Sun cc

Question

When using gdb to debug C code compiled with Sun's cc, the step-into doesn't work, i can only "step into" a function if i put a breakpoint on it. Also, sometimes if i set a breakpoint on a function name, like "break foo", gdb indeed breaks when foo is reached, but without showing the source code (this i could not reproduce with a small demo program).
I am using Sun Studio 12 on a SunOS 5.10 sun4u sparc machine.
My demo program is:
#include <stdio.h>
#include <strings.h>
void func1(str)
char str;
printf("This is the first line\n");
printf("STR: %s\n",str);
int main()
char str[10];
strcpy(str,"lalalal");
printf("Calling func1\n");
func1(str);
printf("Returned from func1\n");
The compilation command i run is:
cc -c -g step_into.c -o step_into.o
cc -g -o step_into step_into.o
When running the program with gdb, the "step" command does not step into func1, but runs it like "next".
I know there's the dbx debugger, but if there's a way to fix this with gdb - it is much preferable for us. Switching to dbx is not really feasible for us.
Regards,
Yael

Answer 1

Hello Yael,
I tried your example on my laptop (OpenSolaris x86/x64) with Sun Studio 12 update 1
and GDB 6.3.50 - it works properly:
$ gdb dist/Debug/SunStudio-Solaris-x86/forum_c_20091230
GNU gdb 6.3.50_2004-11-23-cvs
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-pc-solaris2.11"...
(gdb) break main
Breakpoint 1 at 0x8050a87: file src/args.c, line 15.
(gdb) run
Starting program: /export/home/nikm/SunStudioProjects/Forum_C_20091230/dist/Debug/SunStudio-Solaris-x86/forum_c_20091230
Breakpoint 1, main () at src/args.c:15
15         printf("Calling func1\n");
Current language:  auto; currently minimal
(gdb) next
Calling func1
16         func1(str);
(gdb) step
This is the first line
func1 (str=0x80477ba "lalalal") at src/args.c:7
7         printf("STR: %s\n",str);
(gdb) Could you please download and try Sun Studio 12 update 1?
It is available for free. Here is the web page:
http://developers.sun.com/sunstudio/
BTW, which GDB version do you use?
I'll try it on a sparc system and let you know.
Thanks.
Nik
P.S.: there is a typo in the source code:
void func1(str)
*char *str;I think it should be:
void func1(char *str)Probably a copy-paste problem.
Please use "CODE" mode when you copy-paste source lines (selected text, press 'CODE' button).