gdb cannot step into printf

Question

here is my sample program:

#include<stdio.h>

int main()
{

printf("hello good morning \n");
return 0;
}


gcc -Wall -g temp.c


/opt/langtools/bin/gdb a.out
HP gdb 3.3 for PA-RISC 1.1 or 2.0 (narrow), HP-UX 11.00.
Copyright 1986 - 2001 Free Software Foundation, Inc.
Hewlett-Packard Wildebeest 3.3 (based on GDB) is covered by the
GNU General Public License. Type "show copying" to see the conditions to
change it and/or distribute copies. Type "show warranty" for warranty/support.
..
(gdb) b 6
Breakpoint 1 at 0x2b14: file temp.c, line 6.
(gdb) run
Starting program: /oo_dgfqausr/test/dfqwrk4/temp/a.out

Breakpoint 1, main () at temp.c:6
6       printf("hello good morning \n");
(gdb) step
hello good morning
7       return 0;
(gdb)

as soon as i try to step into the printf function.its exiting and returning to main. does this mean that the shred library in which the printf function is defined is not provided with the debug symbols?Or am i doing something wrong?

Erik · Accepted Answer · 2011-04-01 11:49:52Z

7

This means there's no available source/debug symbols for printf. You can use stepi to step into printf anyway, you'll only have disassembly available (use the disas command).

answered Apr 1, 2011 at 11:49

Erik

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2 Comments

Ricko M Over a year ago

Out of curiosity ,does the presence source but not debug symbols mean you can step into a function ?

Erik Over a year ago

@Ricko M: No, you need debug symbols to step into, and source to have gdb display source lines while stepping.

Jonathan · Accepted Answer · 2011-04-01 11:51:09Z

3

That's correct, you likely do not have debugging symbols available. Make sure libc-devel or similar is installed. Also, make sure to compile with -O0 to prevent optimization; optimizations make debugging more difficult to follow.

answered Apr 1, 2011 at 11:51

Jonathan

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Comments

jww · Accepted Answer · 2012-12-22 05:40:07Z

0

Also, -g3 is required for maximum symbols. With -g3, even symbolic constants will be available. -ggdb may be helpful too. Jan from GDB tells us there are no mainline GDB extensions, but Apple may have offered some and omitted backstrem patches.

answered Dec 22, 2012 at 5:40

jww

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