[CMake] Re: Demonstrated CMake.. received a few comments

[kitts]

On Wednesday 24 January 2007 02:15 IST, Claus Klein wrote:
> On Tuesday 23 January 2007 18:10, kitts wrote:
> > On Tuesday 23 January 2007 00:03 IST, kitts wrote:
> > > 2) On windows, we would like to use VS as the IDE and KDevelop on
> > > linux. Both are capable of crosscompiling (use non-native compilers).
> > > I think this is only possible by setting CMAKE_C_COMPILER to the
> > > compiler to use?
> >
> > I tested this today and alas, it doesn't work. :-(
>
> For me it works, but there are some points to know:
>
> cd ~/src/wzdftpd/trunk/build && rm -f CMakeCache.txt &&
> + CC=/tools/LinuxPpcCDK/bin/powerpc-linux-gcc
> + CXX=/tools/LinuxPpcCDK/bin/powerpc-linux-g++
> + AR=/tools/LinuxPpcCDK/bin/powerpc-linux-ar
> + PKG_CONFIG_PATH=/tools/LinuxPpcCDK/lib/pkgconfig
> + CMAKE_LIBRARY_PATH=/tools/LinuxPpcCDK/lib:/tools/LinuxPpcCDK/usr/lib
> +
> CMAKE_INCLUDE_PATH=/tools/LinuxPpcCDK/include:/tools/LinuxPpcCDK/usr/incl
>ude + cmake -DWITH_OpenSSL=ON -DWITH_TCLDev=OFF -DWITH_PerlDev=OFF
> -DWITH_GnuTLS=OFF -DWITH_PostgreSQL=OFF -DWITH_MySQL=OFF
> -DWITH_Zeroconf=OFF -DWITH_TESTS=OFF .. -- Check for working C compiler:
> /tools/LinuxPpcCDK/bin/powerpc-linux-gcc -- Check for working C compiler:
> /tools/LinuxPpcCDK/bin/powerpc-linux-gcc -- works -- Check size of void*
> -- Check size of void* - done
> -- Found OpenSSL: /tools/LinuxPpcCDK/lib/libssl.so
> -- Looking for pthread.h
> -- Looking for pthread.h - found

I'll try this and let you know how it goes. Thanks!

> You cannot change CMAKE_C_COMPILER without deleting the entire binary
> tree and starting over. Once the compiler is set, it's set. This is one
> of the few cmake variables that you cannot change once it has been set.
>
> I found only one hint in http://www.cmake.org/Wiki/CMake_Useful_Variables
> about cross-compile.

That's been very useful but i dint figure out ways to use it such as 
described above. :-)

> > CMake wasn't designed with cross-compiling in mind was it? I'm sure
> > hoping it fills this gap. I like it so much better than the
> > competition. :-)
>
> That is my opinion too.

The work above is still a "hack". Hope it becomes more straight forward. 
Fingers crossed. ;-)
-- 
Cheers!
kitts