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Re: troubles while building wxWindows/C++ Mingw executables using Cygwin
- To: Chris <Christine.Pourcelot@inria.fr>
- Subject: Re: troubles while building wxWindows/C++ Mingw executables using Cygwin
- From: Mumit Khan <firstname.lastname@example.org.EDU>
- Date: Wed, 10 Mar 1999 13:14:16 -0600
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Chris <Christine.Pourcelot@inria.fr> writes:
> I'm trying to build wxWindows/C++ Mingw executables using Cygwin.
> I've followed the instructions given by Mumit Khan :
> * got egcs-1.1.1-mingw-libs.tar.gz
> * installed the target libraries in /usr/local/mingw-libs
> * add -mno-cygwin to gcc -c
> * add -L/usr/local/mingw-libs to gcc -o
> It works well with the small hello.c program (thanks Mumit, the tutorial
> is clear and well done)
There are a (potential) minor pitfalls with both wxWindows makefiles and
Cygwin -mno-cygwin support that is causing these.
1. /wx/src/msw/textctrl.cpp:71: undefined reference to
`streambuf::xsputn(char const *, long)' ...
When compiling C++ applications that use the libio stuff, you'll need
to have a Mingw compatible _G_config.h. However, Cygwin b20.1 as
distributed only supplies the _G_config.h for Cygwin and you're getting
For Mingw, the above should be:
`streambuf::xsputn(char const *, int)' ...
Thanks for pointing this out. I'll add this to the mingw-libs package
for egcs-1.1.2. I'm attaching a copy of _G_config.h for i386-mingw32
that should fix this. Just put it somewhere and point to the place
with -I so that it picks this one instead of the installed one.
2. /usr/local/mingw-libs/libstdc++.a(iostream.o)(.text+0x18a9): undefined
reference to `__imp__iob'
reference to `_errno'
The linker is picking the math library for Cygwin, not the empty stub
used for Mingw. If you don't have a Mingw math library, you can create
one as following:
$ ar crv libm.a
$ ranlib libm.a
and then relink. This should certainly fix _errno problem; I'm hoping
that it'll take care of the _imp_iob problem as well.
Let me know if this doesn't fix your problem.
The problems you're running into unfortunately a fact of life when you're
trying to do cross (or pseudo-cross in this case ;-) compilation/linking.
You'll probably have to do a bit more digging to make sure all the right
includes and libraries are picked up instead of using the Cygwin ones.
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