[Bug gdb/11562] New: gdb does not enter an internally defined function

[Bug gdb/11562] New: gdb does not enter an internally defined function

[Nicolas dot Sabouret at lip6 dot fr]

This bug was reproduced on both gdb 7.0 under ubuntu 9.10 using gcc 4.4.1 and
gdb 7.1, ubuntu 10.04 LTS, gcc 4.4.3.

I packaged all the files required to reproduce the bug. You can download the
archive at the following URL (200 Ko):
http://www-poleia.lip6.fr/~sabouret/gdb.tar.gz

Compilation:
$ gcc -DFONTFILE='"/...../font.ttf"' cini.c cini_color.c cini_graphic.c
/...../morpion_CINI.c -o momo -g -lSDL -lSDL_ttf

Execution:
$ gdb momo
[...]
(gdb) break 175
Breakpoint 1 at ...
(gdb) run
Starting program: ...
178	    afficher_menu12q();
(gdb) n
179	    s = choisir_menu12q();
(gdb) s

=> Here, GDB simply freezes *without entering function
"choisir_menu12q", which is defined several lines above in the same file
(morpion_CINI.c).
Surprisingly, finishing the game release gdb and terminates the
execution correctly

However, the most surprising is that if we compile with the -O option :

$ gcc -DFONTFILE='"/..../font.ttf"' cini.c cini_color.c cini_graphic.c
/..../morpion_CINI.c -o momo -g -lSDL -lSDL_ttf -O

Then the same debug commands lead to a correct execution :

[...]
179	    s = choisir_menu12q();
(gdb) s
choisir_menu12q () at /...../morpion_CINI.c:37
37	    CINI_loop_until_clic();

=> gdb enters the function.


About the context of this bug :

We are professors at the French University Pierre & Marie Curie and we
are developing a C library for beginners in C (1st year undergraduate
students). We aim at providing end-user debugging functions based on gdb in next
September for our students. Could you help us identifying (and solving) the
problem before next semester?

Thanks in advance for you help and all the great work you do,

-- 
           Summary: gdb does not enter an internally defined function
           Product: gdb
           Version: 7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: Nicolas dot Sabouret at lip6 dot fr
                CC: gdb-prs at sourceware dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=11562

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[Bug gdb/11562] gdb does not enter an internally defined function

[Nicolas dot Sabouret at lip6 dot fr]

------- Additional Comments From Nicolas dot Sabouret at lip6 dot fr  2010-05-03 08:02 -------
Created an attachment (id=4761)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=4761&action=view)
Files used to reproduce the bug

I just noticed it was possible to attach the archive file to the bug. Here it
is...

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[Bug gdb/11562] gdb does not enter an internally defined function

[msnyder at sonic dot net]

------- Additional Comments From msnyder at sonic dot net  2010-05-12 22:46 -------
Could you include the compiled binary "momo" please?
I can't build it without these SDL libraries.

Thanks,



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[Bug gdb/11562] gdb does not enter an internally defined function

[sergiodj at redhat dot com]

------- Additional Comments From sergiodj at redhat dot com  2010-05-13 04:36 -------
Hi,

I tried to compile your files, but it seems "cini.h" is missing.  If you can,
attach is as well.

Thanks.

-- 


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[Bug gdb/11562] gdb does not enter an internally defined function

[Nicolas dot Sabouret at lip6 dot fr]

------- Additional Comments From Nicolas dot Sabouret at lip6 dot fr  2010-05-14 07:51 -------
Created an attachment (id=4791)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=4791&action=view)
compiled program

I confirm that cini.h is in the archive (previous attachement). I just
downloaded it to check. ;)

Here is the "momo" file compiled with :
gcc -DFONTFILE='"/...../font.ttf"' cini.c cini_color.c cini_graphic.c
morpion_CINI.c -o momo -g -lSDL -lSDL_ttf

which does not enter the "choisir_menu12q" function.


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[Bug gdb/11562] gdb does not enter an internally defined function

[Nicolas dot Sabouret at lip6 dot fr]

------- Additional Comments From Nicolas dot Sabouret at lip6 dot fr  2010-05-14 07:54 -------
Created an attachment (id=4792)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=4792&action=view)
compiled program, with -O

Here is the second version of "momo", compiled with the "-O" option, which
enters the function...

gcc -DFONTFILE='"/home/nico/Bureau/tmp/font.ttf"' cini.c cini_color.c
cini_graphic.c morpion_CINI.c -o momo2 -g -lSDL -lSDL_ttf -O


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