[CMake] cmake needs 2 runs to find boost

[Benedikt Hegner]

Hi Peter,

as I don't use windows at all, this is just a very wild guess...

Could it be that in the second run you actually don't use
   /CMake/share/cmake-3.2/Modules/FindBoost.cmake
but boost-config.cmake, which it now finds in the cached environment of 
the first run?

This assumes of course that you built boost w/ CMake and not bjam...

Cheers,
   Benedikt

On 03.11.2015 14:10, Peter Steinbach wrote:
> Hi to all,
>
> I tested this with cmake 3.2.2 and 3.3.2 and still get the same problem.
> I'd like to use boost with gcc on windows 7 64bit. I installed boost and gcc
> with msys2 as I cannot use MSVC for the actual project I am looking into for
> this.
>
> the funny thing, if I use the attached CMakeLists.txt on the machine and call:
> ```
> $ cmake -G "MSYS Makefiles" -DBOOST_ROOT=C:/msys64/mingw64 -
> DBOOST_LIBRARYDIR==C:/msys64/mingw64/lib ..
> -- The CXX compiler identification is GNU 4.9.2
> -- Check for working CXX compiler: C:/msys64/usr/bin/g++.exe
> -- Check for working CXX compiler: C:/msys64/usr/bin/g++.exe -- works
> -- Detecting CXX compiler ABI info
> -- Detecting CXX compiler ABI info - done
> -- Detecting CXX compile features
> -- Detecting CXX compile features - done
> setting win specific stuff
> CMake Error at C:/Program Files
> (x86)/CMake/share/cmake-3.2/Modules/FindBoost.cmake:1182 (message):
>    Unable to find the requested Boost libraries.
>
>    Boost version: 1.57.0
>
>    Boost include path: C:/msys64/mingw64/include
>
>    Could not find the following static Boost libraries:
>
>            boost_filesystem
>            boost_system
>
>    No Boost libraries were found.  You may need to set BOOST_LIBRARYDIR to the
>    directory containing Boost libraries or BOOST_ROOT to the location of
>    Boost.
> Call Stack (most recent call first):
>    CMakeLists.txt:17 (FIND_PACKAGE)
>
>
> CMake Error at CMakeLists.txt:24 (MESSAGE):
>    Boost not found (C:/msys64/mingw64)
>
>
> -- Configuring incomplete, errors occurred!
> See also
> "C:/msys64/home/steinbac/development/cmake_sandbox/find_boost/build/CMakeFiles/CMakeOutput.log".
> $ cmake -G "MSYS Makefiles" -DBOOST_ROOT=C:/msys64/mingw64 -
> DBOOST_LIBRARYDIR==C:/msys64/mingw64/lib ..
> setting win specific stuff
> Boost 1.57 found __
> -- Configuring done
> -- Generating done
> -- Build files have been written to:
> C:/msys64/home/steinbac/development/cmake_sandbox/find_boost/build
> ```
>
> I'd like to link statically to multithreaded libboost_*-mt.a from my app. But
> it proofes really hard to find Boost in the first place.
> Any ideas?
>
> Peter
>
>
>

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