GDB won't "step in" (s)

[dave@…]

Compile this program with gcc -O0 -g x.c -o x, then ggdb x. Enter b main, then run, then s. The program should be stopped on line 3 (return 5), but it's not.

int f()
{
    return 5;
}

int main()
{
    return !f();
}

[dave@…]

Sorry, this was my own port@7.4.1 Now trying 7.5 and will close if invalid

[dave@…]

Works! I don't have permissions to close the ticket, but someone should

[dave@…]

I take it back. Modify the program by adding the inline keyword before f, and it's still broken.

[dave@…]

If I compile with -finline-limit=0 I can "step in" again. Not sure if there's a bug in a tool or just with me :-)

[jmroot (Joshua Root)]

Seems odd that gcc would be inlining at -O0, but I think if the function is inlined, it's physically impossible to step into it because there's no code emitted for it.

[dave@…]

There certainly is code emitted for inline functions, and I can step into them using the system gdb.

pluto:/tmp dave% cat > tst.c
inline int f()
{
    return 5;
}

int main()
{
    return !f();
}
pluto:/tmp dave% /usr/bin/gcc -O0 -g tst.c -o tst
pluto:/tmp dave% /usr/bin/gdb tst
GNU gdb 6.3.50-20050815 (Apple version gdb-1822) (Sun Aug  5 03:00:42 UTC 2012)
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 "x86_64-apple-darwin"...Reading symbols for shared libraries .. done

(gdb) b main
Breakpoint 1 at 0x100000ee4: file tst.c, line 8.
(gdb) run
Starting program: /private/tmp/tst 
Reading symbols for shared libraries +............................. done

Breakpoint 1, main () at tst.c:8
8	    return !f();
(gdb) s
f () at tst.c:3
3	    return 5;

[cooljeanius (Eric Gallager)]

Cc Me!

[mf2k (Frank Schima)]

dweber has retired. See #43834.

[stuartwesterman (Stuart Westerman)]

There is no problem now. Please close.