Mail Archives: cygwin/2001/09/04/21:52:06
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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