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Date: Tue, 15 Mar 2011 16:03:40 +0100
Message-ID: <AANLkTikZrtHtaQ8zOsS_Wg6EtMMA7L8BkLp8UgFWbLKY@mail.gmail.com>
Subject: Re: Fedora Cygwin RPM repository
From: Reini Urban <rurban@x-ray.at>
To: cygwin@cygwin.com
Cc: Corinna Vinschen <corinna-cygwin@cygwin.com>
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2011/3/14 Corinna Vinschen:
> On Mar 14 14:08, Ren=E9 Berber wrote:
>> On 3/14/2011 3:59 AM, Corinna Vinschen wrote:
>>
>> [snip]
>> > I also found another strange problem. =A0It's practically impossible to
>> > debug a Cygwin DLL built with this gcc/g++. =A0The debug line number
>> > information appears to be screwed up.
>>
>> You need gdb 7.0 or above (current is 7.2 and builds out of the box).
>> The info about this is in http://gcc.gnu.org/gcc-4.5/changes.html .
>
> Thanks for the info!

Or build with the old dwarf format, which gdb-6.8 understands:
-gdwarf-3 -gstrict-dwarf

gcc-4.5 uses dwarf4 features, gcc-4.3 and gdb-6.8 only understand dwarf3.

Within my perl config:
# cygwin still has the old gdb-6 debugger which does not understand
dwarf4 features from gcc-4.5
if ($Config{gccversion} =3D~ /^4\.[56]\./) {
    my $gdb_ver =3D `gdb --version`;
    if ($gdb_ver =3D~ /gdb 6\./) {
        print "Adding extra_cflags=3D-gstrict-dwarf for gcc-4.5 for a
gdb-6 debugger which does not understand dwarf4 features\n";
        $extra_cflags .=3D " -gstrict-dwarf";
    }
}
--=20
Reini Urban
http://phpwiki.org/=A0 =A0 =A0 =A0 =A0=A0 http://murbreak.at/

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