Mail Archives: cygwin/2001/09/05/17:52:40
Hi folks,
Given what cgf states below, depending on your needs of course, it might be less hassle
to use Mingw tool set as it has no problems with C++ and, last I checked, was working just fine
with libstdc++.
So, as noted, -mno-cygwin WORKS with Cygwin gcc, but not with Cygwin g++. For a
WORKING version of something approximating the bash command "g++ <xxx> -o<xxx> -mno-
cygwin", it may simplify things immensely just to use Mingw "g++" instead of Cygwin "g++ -mno-
cygwin".
Paul G.
On 4 Sep 2001 at 21:51, the Illustrious Christopher Faylor wrote:
> On Tue, Sep 04, 2001 at 08:26:58PM -0700, Mike Bresnahan wrote:
> >> >-- begin --
> >> >/usr/local/src/no-cygwin-bug: make
> >> >gcc -c -I/usr/local/src/mingw32/gcc-2.95.2/include/g++-3
> >> -mno-cygwin main.cc
> >> >gcc -I/usr/local/src/mingw32/gcc-2.95.2/include/g++-3 -mno-cygwin
> >> >main.o
> >> -L/usr/local/src/mingw32/gcc-2.95.2/lib/gcc-lib/i386-mingw32msvc/2.95
> >> >.2 -lstdc++ -lm -o main
> >> ^^^
> >> Do not link with this. A 'ls -l /usr/lib/libm.a' will probably
> >> show you why.
> >
> >Thanks. Ok so which math library do I use then?
>
> I don't know. I assume that you don't need any, however, that's a
> question for the mingw mailing list. You probably should just try it
> without the -lm. It might just work.
>
> >Also I notice that the mingw32 math.h is missing asinf() and some
> >others, but perhaps that is a question for the mingw32 list.
> >
> >> >Note that I have downloaded mingw32 and am pointing at its headers
> >> >and libraries, because cygwin is missing the ANSI C++ headers and
> >> >libraries.
> >>
> >> I don't know what this means. Cygwin comes with a complete set of
> >> headers and libraries and it also includes fairly recent mingw
> >> headers and libraries, with the exception of libstdc++.a.
> >
> >Okay, I stand corrected. It appears that the ANSI C++ headers are in
> >/usr/include/g++-3. However I still need libstdc++.a, no?
>
> Actually, for -mno-cygwin, you *will* probably need the mingw g++-3
> versions. If you are just using -mno-cygwin for ANSI C++ headers,
> though, then there is no reason to do that.
>
> So, to summarize:
>
> 1) Just removing -lm may work, unless you're using the cygwin version of
> libstdc++.a.
>
> 2) Otherwise, you really do need the mingw header files an libstdc++.a
> if
> you want to build with -mno-cygwin. Just make sure that you are not
> pulling in any cygwin libraries and you should be ok.
>
> cgf
>
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