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Date: Wed, 01 Jul 2015 23:57:42 +0200
From: "Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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To: djgpp AT delorie DOT com
Subject: Re: gdb 7.0 and coff debug format failing.
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Reply-To: djgpp AT delorie DOT com

Am 30.06.2015 19:47, schrieb Eli Zaretskii (eliz AT gnu DOT org):
>> Date: Tue, 30 Jun 2015 10:11:44 -0700 (PDT)
>> From: "Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de)"<djgpp AT delorie DOT com>
>>
>> Can you tell me what binutils you are using?  I do not know if it is of any importance but we can try some older version that bnu22b.
>
> I have Binutils 2.19 here.

OFYI, I have recompiled gdb771 using gcc510, bnu225br2 and djdev205.
Then I have compiled the following test program using gcc346b, bnu225br2
and djdev205:

--------------------  b.c start --------------------
#include <stdlib.h>
#include <string.h>

char *allocate_string(const char *message)
{
   char *string = NULL;
   size_t bytes = -1;

   bytes = strlen(message);

   string = malloc(bytes);
   if (string)
   {
     size_t i;
     for (i = 0; i < bytes; i++)
       string[i] = message[i];
     string[i] = '\0';
   }

   return string;
}
--------------------  b.c end --------------------

--------------------  a.c start --------------------
#include <stdio.h>

char *allocate_string(const char *message);

int do_print(const char *message)
{
   int bytes;

   bytes = printf("This is the message:  \"%s\"\n", message);

   return bytes;
}

int print(const char *message)
{
   int bytes;

   bytes = do_print(allocate_string(message));

   return bytes;
}

int main(void)
{
   char message[] = "qwertz";
   int bytes;

   bytes = print(message);

   return bytes;
}
--------------------  a.c end --------------------

--------------------  gdb.txt start --------------------
b main
b 16
b 7
b b.c : 6
r
info source
--------------------  gdb.txt end --------------------

I am still not able to step into certain functions.  Specially if the functions
are defined in different files.  I was able to step from main into print().
But I was not able to step from inside print() into do_print().  Please note
that the argument of do_print is the function allocate_string() defined in b.c.

But if I write a control file for gdb like gdb.txt then it becomes possible to
stop in every function no matter in which file it is defined.  This may be a
little bit cumbersome but it seems to work.  I know that this is certainly not
a "complex" program but I think that it demonstrates that a combination of gcc346b,
bnu225br2, gdb771b (to be recompiled with djdev205) and djdev205 may be usefull
to continue developing emacs.  Of course, in the end it must really be tried by
compiling emacs.  Anything else will never give a definitive answer to this issue.

Regards,
Juan M. Guerrero