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From: sjw <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Problem with streams using 64-bit compiler
Date: Mon, 4 Jan 2010 15:41:10 -0800 (PST)
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Date: 2010-01-04T15:41:10-08:00
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On Jan 4, 11:09=A0pm, Ludovic Brenta <ludo...@ludovic-brenta.org> wrote:
> On Jan 4, 11:46=A0pm, sjw <simon.j.wri...@mac.com> wrote:
>
>
>
> > While trying to build a 64-bit compiler for Mac OS X Snow Leopard, I
> > came across this undesirable behaviour: if the program (see end) is
> > compiled in 32-bit mode or in 64-bit mode with -O0 it works fine,
> > output is as expected:
>
> > $ ./streamy
> > =A01234
> > 'z'
> > =A04.32100E-01
> > =A04.32100E-01
>
> > If compiled in 64-bit mode with -O2, output is
>
> > $ ./streamy
> > 1234
> > NUL
> > =A00.00000E+00
> > =A00.00000E+00
>
> > This is a readback problem, the data file has the same content in all
> > cases.
>
> > Can anyone with access to an x86_64 compiler (Mac OS X Leopard, or a
> > Linux, 4.4+) have a try and see what happens?
>
> [...]
>
> I get the same behavior as you on Debian:
>
> gnat-4.4_4.4.2-5_amd64.deb:
> =A0-O0 OK
> =A0-O1 bug
> =A0-O2 bug
> gnat-4.4_4.4.2-5_i386.deb:
> =A0-O0 OK
> =A0-O1 OK
> =A0-O2 OK
>
> This version of GNAT is taken from the FSF's gcc-4_4-branch on
> 2009-12-28 so is very recent.

Thanks for that.

> I suggest you report the bug to http://gcc.gnu.org/bugzilla. =A0Since
> you've got a perfect reproducer test case, the bug should be easy
> enough to fix.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D42618

> Maybe someone else can try GCC 4.5?

Last time I tried to build 4.5.0 I got a compiler bomb while compiling
a-direct.adb, no changes since then. Time to file a bug on that I
guess!