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From: Rugxulo <rugxulo AT gmail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Difficulties compiling emacs with gcc 4.6.2
Date: Wed, 25 Apr 2012 13:13:19 -0700 (PDT)
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Reply-To: djgpp AT delorie DOT com

Hi,

On Apr 25, 12:46 pm, Eli Zaretskii <e DOT  DOT  DOT  AT gnu DOT org> wrote:
> > From: Juan Manuel Guerrero <juan DOT guerr DOT  DOT  DOT  AT gmx DOT de>
> > Date: Wed, 25 Apr 2012 19:35:54 +0200
> > Cc: dj DOT  DOT  DOT  AT delorie DOT com
>
> >             compiling         debuging
> >           COFF     DWARF    COFF     DWARF
> >        +--------+--------+--------+--------+
> > gcc445 |   OK   |   OK   |   OK   |   KO   |
> >        +--------+--------+--------+--------+
> > gcc452 |   KO1  |   KO1  |   KO   |   KO   |
> > gcc453 |   KO1  |   KO1  |   KO   |   KO   |
> >        +--------+--------+--------+--------+
> > gcc461 |   KO2  |   KO1  |   --   |   --   |
> > gcc462 |   KO2  |   KO1  |   --   |   --   |
> > gcc463 |   KO2  |   KO1  |   --   |   --   |
> >        +--------+--------+--------+--------+
> > gcc470 |   KO2  |   KO1  |   --   |   --   |
> >        +--------+--------+--------+--------+
>
> > KO1 compiling means that temacs is build but the dump process does not work.
> > Neither emacs.exe nor a stack trace are produced.

I guess nobody ever needed unexec on DWARF to work when COFF was
sufficient.

> > KO2 compiling means that the compiler produces brocken assembler output due
> > to brocken COFF debug info support.  No temacs is produced at all.
>
> > KO debuging means that the produced binary seems to have no line information
> > so that it is not possible to set break points and to step trough the binary.
>
> Thanks.  So it seems like we still need to use -gcoff to produce a
> working and debuggable binary.

It's obvious that GCC 4.5.0 broke some stuff, but that's also when
they removed support for "generic" COFF. I know DJ wants COFF support
to always be present, but clearly ELF support in BinUtils + GCC takes
much higher priority. But I don't think we can gather enough steam to
do much about it.