CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Looking here [1], you should have all you need to specify were your gmp is.


Sebastien.


[1] 
http://www.cgal.org/Manual/latest/doc_html/installation_manual/Chapter_installation_manual.html#Subsection_16.4

On 11/17/2012 02:22 AM, 

 wrote:
> I am trying to cross-compile CGAL 4.1 on amd64 Linux to ARM Linux.
>
> As per the CMake documentation, I pass these arguments: -D
> CMAKE_SYSTEM_NAME=Linux -D CMAKE_C_COMPILER=$CC -D
> CMAKE_CXX_COMPILER=$CXX. (Where CC and CXX point to the cross-compiler.)
>
> The problem I am experiencing is due to CGAL trying to determine the
> version of GMP on my system. Here's the log:
>
> -------------------------------- start log ----------------------------
> Run Build Command:/usr/bin/gmake "cmTryCompileExec/fast"
> /usr/bin/gmake -f CMakeFiles/cmTryCompileExec.dir/build.make
> CMakeFiles/cmTryCompileExec.dir/build
> gmake[1]: Entering directory
> `/home/pmw/Software-Engineering/SW_Tools/CGAL-4.1/CMakeFiles/CMakeTmp'
> /usr/bin/cmake -E cmake_progress_report
> /home/pmw/Software-Engineering/SW_Tools/CGAL-4.1/CMakeFiles/CMakeTmp/CMakeFiles
> 1
> Building CXX object CMakeFiles/cmTryCompileExec.dir/print_GMP_version.cpp.o
> /opt/Rockwell/ArmTools_GCC435_GLIBC_Q3_2011/bin/arm-rc-linux-gnueabi-g++
> -I/home/pmw/Software-Engineering/build/Lib/mpir-2.6.0/arm/include -o
> CMakeFiles/cmTryCompileExec.dir/print_GMP_version.cpp.o -c
> /home/pmw/Software-Engineering/SW_Tools/CGAL-4.1/config/support/print_GMP_version.cpp
>
> Linking CXX executable cmTryCompileExec
> /usr/bin/cmake -E cmake_link_script
> CMakeFiles/cmTryCompileExec.dir/link.txt --verbose=1
> /opt/Rockwell/ArmTools_GCC435_GLIBC_Q3_2011/bin/arm-rc-linux-gnueabi-g++
> -fPIC CMakeFiles/cmTryCompileExec.dir/print_GMP_version.cpp.o -o
> cmTryCompileExec -rdynamic
> /home/pmw/Software-Engineering/build/Lib/mpir-2.6.0/arm/lib/libgmp.a
> gmake[1]: Leaving directory
> `/home/pmw/Software-Engineering/SW_Tools/CGAL-4.1/CMakeFiles/CMakeTmp'
> /home/pmw/Software-Engineering/SW_Tools/CGAL-4.1/CMakeFiles/CMakeTmp/cmTryCompileExec:
> /home/pmw/Software-Engineering/SW_Tools/CGAL-4.1/CMakeFiles/CMakeTmp/cmTryCompileExec:
> cannot execute binary file
>
> -- USING GMP_VERSION = 'unknown'
> -------------------------------- finish log ----------------------------
>
> CGAL uses the get_dependency_version macro (in
> cmake/modules/CGAL_Macros.cmake) to try to find the version. That macro
> doesn't explicitly accommodate cross-compiling. It calls try_run.
>
> First, I am suspicious that I didn't do enough to put CMake into
> cross-compilation mode. Some online searching indicates that CMake is
> expected to print this: "CMake Error: TRY_RUN() invoked in
> cross-compiling mode, please set the following cache variables
> appropriately." But I don't see that in my run. I tried defining
> CMAKE_CROSSCOMPILING, but that didn't change anything.
>
> My online research points to this as the best solution:
> http://www.cmake.org/Wiki/CMake_Cross_Compiling#Using_executables_in_the_build_created_during_the_build
>
>
> But as I understand the solution, this is something to be fixed in
> CGAL's CMake files rather than something for me configure. Am I correct?
>
> Alternately, it seems that I can create my own .cmake file where I
> define GMP_VERSION, and pass that cmake file using the -C argument. I
> got this idea from here:
> http://www.cmake.org/Wiki/BuildingPythonWithCMake#Cross_compiling_Python_for_another_platform
>
>
> Is this the way to go? Or is there an even better way of solving this
> problem?
>
> Also, please consider this a bug report / enhancement request. I'd like
> if it was possible to specify the GMP (and MPFR, etc.) version as -D
> arguments to CMake. Maybe you can make these valid only when in
> cross-compilation mode.
>
> Thanks.
>
> --
> Philip