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Date: Sat, 22 Sep 2012 02:59:53 -0700 (PDT)
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Subject: Re: gcc behaviour if djgpp.env is not available.
From: Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
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On 22 Sep., 07:44, Andris Pavenis <andris DOT pave DOT  DOT  DOT  AT iki DOT fi> wrote:
> On 09/02/2012 01:11 AM, Juan Manuel Guerrero wrote:
>
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> > On 1 Sep., 15:22, Andris Pavenis <andris DOT pave DOT  DOT  DOT  AT iki DOT fi> wrote:
> >> On 30.8.2012 23:44, Juan Manuel Guerrero wrote:
>
> >>> I do not know if this issue has already been discused but I have noticed
> >>> that the DJGPP port of gcc crashes if it does not find djgpp.env.  If gcc
> >>> needs to load djgpp.env and fails, would not it be better that it issues
> >>> some kind of error message instead of crashing?
> >>> For an user not familiar with DJGPP it would be hard to figure out
> >>> what has gone wrong.
>
> >>> The output below is produced by gcc471b on WinXP after having deleted
> >>> djgpp.env.
>
> >> Did some debugging (gdb xgcc.exe, command line parameters -B./
> >> -print-prog-name=cc1)
>
> >> The crash is in src/crt0/crt0.S in dos_alloc_ok().
> > [snip]
>
> > Unfortunately I am not familiar at all with the assembler stuff
> > in src/crt0/crt0.S.  Have we to fix something or is there something
> > brocken in gcc itself?
>
> Tried to debug the issue. I was wrong. It is not crt0.S issue but
> simply call to wild pointer which causes jump to pointer inside crt0.S.
>
> The real reason is using macro GCC_DRIVER_HOST_INITIALIZATION macro before
> diagnostic output is set up which results in use of uninitialized data
> as the mentioned macro calls fatal_error() to report DJGPP setup error.
>
> In upcoming GCC-4.8.0 the order is
>
>    /* Unlock the stdio streams.  */
>    unlock_std_streams ();
>
>    gcc_init_libintl ();
>
>    diagnostic_initialize (global_dc, 0);
>
> #ifdef GCC_DRIVER_HOST_INITIALIZATION
>    /* Perform host dependent initialization when needed.  */
>    GCC_DRIVER_HOST_INITIALIZATION;
> #endif
>
> so it is not surprising that that there were no similar problems
> with gcc-4.8.0 snapshots.
>
> So the fix is to backport gcc-4.8.0 change to 4.7.
>
> Andris

Thank you for the evort.

Reagards,
Juan M. Guerrero