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Date: Tue, 30 Jun 2015 13:31:41 +0300
From: "Andris Pavenis (andris DOT pavenis AT iki DOT fi)" <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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On 30.6.2015 1:00, Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) wrote:
> On Monday, June 29, 2015 at 10:15:30 PM UTC+2, Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) wrote:
>> I have compiled gdb 7.0 with both compilers gcc 5.1.0 and gcc 3.4.6 using
>> in both cases djdev205.  The result is disapointing.  I have compiled the
>> following small hello-world program:
>>
>> #include <stdio.h>
>>
>>
>> int print(const char *message)
>> {
>>     int bytes;
>>
>>     bytes = printf("This is the message:  \"%s\"\n", message);
>>
>>     return bytes;
>> }
>>
>> int main(void)
>> {
>>     char message[] = "qwertz";
>>     int bytes;
>>
>>     bytes = print(message);
>>
>>     return bytes;
>> }
>>
>>
>> If I use DWARF2 format everthing works as expected but if I use the coff debug
>> format I cannot step into the function that prints.  I can step through the main
>> function with problems but I cannot step into functions.  Off course the test program
>> has been compiled using gcc 3.4.6.  The output of the info source command is:
>>
>> (gdb) info source
>> Current source file is a.c
>> Located in m:/_tests_gdb/a.c
>> Contains 21 lines.
>> Source language is c.
>> Compiled with COFF debugging format.
>> Does not include preprocessor macro info.
>>
>> so gcc 3.4.6 seems to produce coff debug info and gdb 7.0 seems to recognize
>> this.  I will compile gdb 7.0 using djev203 and see if there is any difference.
>> I will also compile gdb 6.8a with djdev205, bnu225br2 and gcc346 to see if it
>> works better.  Of course, all binaries used have been downloaded from
>> http://ap1.pp.fi/djgpp/next/v2gnu.
>> Any suggestions are welcome.
>>

This problem seems to happen not always

Used https://gmplib.org/pi-with-gmp.html as another example. For it 
stepping into function works for some calls and does not for others
with gdb-7.7.1 when built with gdb-3.4.6 using COFF debugging info.
gdb-7.9.1 crashes (SIGABRT) in this case.

Andris