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Re: m4-1.4.x fails to build git Autoconf for some x

From: Brian Dessent
Subject: Re: m4-1.4.x fails to build git Autoconf for some x
Date: Tue, 25 Mar 2008 10:23:34 -0700

Eric Blake wrote:

> It may have one other difference, not shown in the diff.  I know that on
> cygwin, you can link any program with binmode.o, textmode.o, or automode.o
> (provided alongside crt0.o) to force O_BINARY, O_TEXT, or input in O_TEXT
> output in O_BINARY.  Perhaps part of what makes Chuck's prebuilt m4
> special is that he pulled in one of these extra platform .o files during
> the link phase to change the default mode of stdin/stdout and default
> behavior of fopen from what you get in a vanilla build.

MSYS does ship with a binmode.o but it's practically a no-op.  One of
the differences between MSYS and Cygwin is that everything is binmode
with MSYS: all mounts are binary and I think that even if you call
open(file, O_TEXT) it is still opened in binary mode.  It does seem to
have a working setmode() and ships with a textmode.o which does appear
to actually change the default, but I can't imagine anyone using them
given that the intent was for textmode to no longer exist -- especially
in this case since the patch adds code to explicitly ignore carriage
returns in m4.


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