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Message-ID: <3C39B0B4.D220C5CA@yahoo.com>
Date: Mon, 07 Jan 2002 09:29:08 -0500
From: Earnie Boyd <earnie_boyd AT yahoo DOT com>
Reply-To: CU List <Cygwin AT cygwin DOT com>
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To: CU List <Cygwin AT cygwin DOT com>
CC: Jon Leichter <jonleichter AT mediaone DOT net>,
   "J. Henning Schwentner" <hschwentner AT yahoo DOT com>
Subject: Re: Compiling apps to Mingw32 with cygwin
References: <3C391A0A DOT 758D073 AT yahoo DOT com>
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> Subject: RE: Compiling apps to Mingw32 with cygwin
> Date: Sat, 5 Jan 2002 11:35:14 -0800
> From: "Jon Leichter" <jonleichter AT mediaone DOT net>
> Reply-To: "Jon Leichter" <jon AT symas DOT com>
> To: "J. Henning Schwentner" <hschwentner AT yahoo DOT com>
> CC: <cygwin AT cygwin DOT com>
> 
> Hi Henning.
> 
> You can use Cygwin's GCC. It's just a little more involved. Here's a short
> answer. When you configure, do so like this:
> 
>         $ env CC="gcc -mno-cygwin" ./configure --host=i386-pc-mingw32
> 
> Notice that your --host specification was a little off. The way that I have
> specified it is the standard way. If your configure script uses the format
> that you've specified then your format is correct.
> 
> If your configure script uses Libtool, then the above method will not be
> sufficient. Libtool likes to strip the -mno-cygwin switch off at link time.
> For this, I use a wrapper script for MinGW. It's called mgcc, and it looks
> like this:
> 
>         $ cd /usr/bin
>         $ cat > mgcc
>         gcc -mno-cygwin $*
>         ^D
> 
> Now your configure line looks like this:
> 
>         $ env CC=mgcc ./configure --host=i386-pc-mingw32
> 

> Subject: Re: Compiling apps to Mingw32 with cygwin
> Date: Sun, 6 Jan 2002 14:57:23 +0100
> From: "J. Henning Schwentner" <hschwentner AT yahoo DOT com>
> To: <cygwin AT cygwin DOT com>
> 
> Thanks for your quick help, this works nice!
> 
> But, it is a bit difficult. I think ideally configure should detect
> --host=mingw32 --build=cygwin and in this case should add --mno-cygwin to
> CFLAGS and CPPFLAGS (and do something to fix libtool).
> 

Both of these are incorrect and both say the same thing as far as
configure is concerned.  You need to specify the full triplet when using
`gcc -mno-cygwin' as your compiler.  The method used above tells
configure that your cross compiling wanting to build an executable for
i386-pc-mingw32 using i686-pc-cygwin.  Instead you should:

CC='gcc -mno-cygwin' CXX='g++ -mno-cygwin' ./configure
--host=i386-pc-mingw32 --build=i386-pc-mingw32 --target=i386-pc-mingw32

OR (if your config.guess and config.sub support it)

CC='gcc -mno-cygwin' CXX='g++ -mno-cygwin' ./configure --host=mingw32
--build=mingw32 --target=mingw32

You probably currently see configure scripts check for cross compiling
and end up with a value of `no' because the executable can be executed. 
This method, IIRC, has changed as of autoconf-2.50 which now compares
the values of host and build to determine the value for cross compiling.

Earnie.

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