[CMake] cmake needs 2 runs to find boost

[Peter Steinbach]

Hi Benedikt,

interesting thought, however I wonder why cmake is then capable of deducing 
the right boost version and include path. Just inside the first error message, 
I see:
(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

strange, isn't it?
Peter


On Thursday, November 05, 2015 11:41:10 AM Benedikt Hegner wrote:
> 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/CMakeF
> > iles/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

-- 
Peter Steinbach, Dr. rer. nat.
HPC Developer

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