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Date: Thu, 5 Nov 2015 18:48:51 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Compile test ncurses program to run independent of cygwin?
Message-ID: <20151105174851.GA20857@calimero.vinschen.de>
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On Nov  5 20:30, Andrey Repin wrote:
> Greetings, Daniel Goldman!
>=20
> > # Found /usr/x86_64-pc-cygwin/sys-root/usr/lib/libncurses.a
> > # Will this let me compile for dos window? Apparently not.
> > $ i686-pc-mingw32-gcc \
      ^^^^=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20
      So you're building for 32 bit mingw

> > -I /usr/x86_64-pc-cygwin/sys-root/usr/include/=20
            ^^^^^^^^^^^^^^^^
	    Pointing the compiler to header files for a Cygwin build,
	    which is a *different* target (i686 vs. x86_64 *and* mingw
	    vs. cygwin)...

> > ncurses.c -L /usr/x86_64-pc-cygwin/sys-root/usr/lib/ -lncurses
                      ^^^^^^^^^^^^^^^^
		      same here

> > ... undefined reference to `initscr'
> > ... more "undefined reference" error messages

...and that's logical result.  Along the same lines you could try to
link powerpc-linux ncurses against arm-freebsd binary.  That just won't
work.

What you need is a i686-mingw ncurses.  Have a look around on the net or
try to build your own.  However, it will probably not work correctly in
a Cygwin pseudo tty due to lack of the Cygwin compat layer implementing
them.

> > ------------------------------------------------------------
>=20
> > My questions:
>=20
> > 1) Did I make a compile-line syntax error? Is there a variation of the=
=20
> > i686-pc-mingw32-gcc command line so I can use cygwin to compile=20
> > ncurses.c to run in dos window, independent of cygwin?
>=20
> I'm no expert, but my first answer would be "yes".
> You shouldn't use cross-compilers directly, rather, use appropriate GCC
> switches to specify host and target subsystems.

Nope, use cross compilers.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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