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From: Chris Faylor <cgf AT cygnus DOT com>
Date: Wed, 5 Apr 2000 10:59:12 -0400
To: cygwin-developers AT sourceware DOT cygnus DOT com
Subject: Re: mingw using wrong errno definition
Message-ID: <20000405105912.B1264@cygnus.com>
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References: <20000405071501 DOT 75956 DOT qmail AT hotmail DOT com>
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In-Reply-To: <20000405071501.75956.qmail@hotmail.com>; from parkerrd@hotmail.com on Wed, Apr 05, 2000 at 12:15:00AM -0700

On Wed, Apr 05, 2000 at 12:15:00AM -0700, Ron Parker wrote:
>In an attempt to build the cinstall source without using MSVC, I have
>made the following minor changes to my local copy of the winsup source
>from CVS. One corrects an obvious typo and the other was so I could
>configure and build everything in one pass from the main directory
>including the cinstall code.
>
>Index: winsup/configure.in
>===================================================================
>RCS file: /cvs/src/src/winsup/configure.in,v
>retrieving revision 1.1.1.1
>diff -r1.1.1.1 configure.in
>60c60
>< SUBDIRS="cygwin w32api mingw utils doc"
>---
>>SUBDIRS="cygwin w32api mingw utils doc cinstall"

Looks good.  Go ahead and check this in.

>Index: winsup/cinstall/Makefile.in
>===================================================================
>RCS file: /cvs/src/src/winsup/cinstall/Makefile.in,v
>retrieving revision 1.2
>diff -r1.2 Makefile.in
>102c102
>< zlib/zlibcygw.a: zlib/Makefile
>---
>>zlib/libzcygw.a: zlib/Makefile

I don't get this one.  My version of Makefile.in doesn't have a blank line
before the "zlib" here.  I've changed this to $(ZLIB) anyway since that
is more consistent.

>`/home/rdparker/cygwin/obj/i686-pc-cygwin/winsup/cinstall/zlib'
>gcc -o setup.exe error.o memory.o setup.o strarry.o cinstall.o -g -O2
>-mno-cygwin zlib/libzcygw.a -lole32 -lwininet -lnetapi32 -ladvapi32
>-luuid
>zlib/libzcygw.a(gzio.o): In function `gz_open':
>/home/rdparker/cygwin/obj/i686-pc-cygwin/winsup/cinstall/zlib/../../../../../src/winsup/cinstall/zlib/gzio.c:155:
>undefined reference to `__errno'
>zlib/libzcygw.a(gzio.o): In function `get_byte':
>/home/rdparker/cygwin/obj/i686-pc-cygwin/winsup/cinstall/zlib/../../../../../src/winsup/cinstall/zlib/gzio.c:241:
>undefined reference to `__errno'
>zlib/libzcygw.a(gzio.o): In function `destroy':
>/home/rdparker/cygwin/obj/i686-pc-cygwin/winsup/cinstall/zlib/../../../../../src/winsup/cinstall/zlib/gzio.c:338:
>undefined reference to `__errno'
>zlib/libzcygw.a(gzio.o): In function `gzread':
>/home/rdparker/cygwin/obj/i686-pc-cygwin/winsup/cinstall/zlib/../../../../../src/winsup/cinstall/zlib/gzio.c:399:
>undefined reference to `__errno'
>zlib/libzcygw.a(gzio.o): In function `gzerror':
>/home/rdparker/cygwin/obj/i686-pc-cygwin/winsup/cinstall/zlib/../../../../../src/winsup/cinstall/zlib/gzio.c:865:
>undefined reference to `__errno'
>collect2: ld returned 1 exit status
>gcc: file path prefix
>`/home/rdparker/cygwin/obj/i686-pc-cygwin/winsup/mingw/' never used
>make: *** [setup.exe] Error 1
>
>It appears that despite the "-mno-cygwin
>-I../../../../src/winsup/mingw/include" switches to gcc, it is still
>picking up the standard cygwin definition of errno. I am too tired to
>have a quick solution to this and I am not sure I would know the right
>one if I were completely awake. Thought I might luck out and fine an
>answer in my mailbox in the morning. :^)

I saw this at one point when I was building cinstall.  I thought it came
from running make in the zlib directory rather than letting it be handled
by the cinstall Makefile.  I didn't get around to changing the zlib Makefile
to correctly set all of the includes so I used the tried-and-true devo technique
of relying on the fact that it was being run from a higher-level directory.

Can you try doing a "make clean all" in the cinstall directory and see if that
"fixes" things?

cgf