[CMake] MSYS2 broken CMAKE_PREFIX_PATH

[CHEVRIER, Marc]

Be aware that MSYS2 environment is a "dual" environment:
* Unix like environment. Executables are in <MSYS2_ROOT>/usr/bin
* Windows like (i.e. understand windows paths but with slashes rather than back-slashes). Executables are in <MSYS2_ROOT>/ mingw(64|32)/bin.

So, if you want a pure unix like usage, you have to install package 'msys/cmake'.
If you use tool in mingw(32|64)/bin (package 'mingw32/mingw-w64-i686-cmake' or ' mingw64/mingw-w64-x86_64-cmake'), use windows paths (ex: C:/DESTDIR/lib/cmake).


On 12/02/2018 09:32, "CMake on behalf of Mario Emmenlauer" <cmake-bounces at cmake.org on behalf of mario at emmenlauer.de> wrote:

    
    Dear Alan,
    
    thanks for your reply! Below more:
    
    On 11.02.2018 23:11, Alan W. Irwin wrote:
    > On 2018-02-11 15:13+0100 Mario Emmenlauer wrote:
    > 
    >>
    >> I use mingw-w64-x86_64-cmake 3.10.2 on MSYS2. Generally it works well,
    >> but just recently I started to have problems with CMAKE_PREFIX_PATH.
    >> Its possible that the problems have been there forever, but I now just
    >> found them due to a better use of CI systems.
    >>
    >> The problem is that cmake is not finding package configuration files
    >> correctly. I have such files in DESTDIR/lib/cmake, i.e. for a library
    >> XXX there are typically files XXXConfig.cmake, XXXConfigVersion.cmake
    >> and XXXTargets.cmake (i.e. for Qt, VTK and others).
    >>
    >> But they are not found when I specify CMAKE_PREFIX_PATH=DESTDIR/lib/cmake
    >> in Unix path style. It does work when I specify the package configuration
    >> directory in Windows style! This makes things quite confusing, because many
    >> find_xxx() commands for headers and libraries work with Unix paths. So now
    >> I need to use CMAKE_PREFIX_PATH=UNIXDESTDIR for the normal find_xxx(), but
    >> add WINDESTDIR\lib\cmake for the package configuration files (*).
    >>
    >> Is this an MSYS2 issue or a standard cmake issue? I reported it with MSYS2
    >> here https://github.com/Alexpux/MINGW-packages/issues/3337 in case someone
    >> can comment?
    > 
    > Hi Mario:
    > 
    > From <https://github.com/msys2/msys2/wiki/MSYS2-introduction>, and
    > what you said above it appears you are using the "native Windows"
    > cmake version from the mingw64 repository rather than the POSIX-style
    > cmake package you can install from the msys2 repository.  I am pretty
    
    Hmm, I don't think I have a native Windows cmake installed. I installed
    mingw-w64-*-cmake from pacman, and I do not find any other cmake.exe in
    PATH or on the hard disk. At least when I do:
    
    #> find /c/ /d/ -name cmake.exe 2>/dev/zero
    /d/msys2/bda/mingw32/bin/cmake.exe
    /d/msys2/bda/mingw64/bin/cmake.exe
    
    I find only the native MSYS2 mingw-w64-x86_64-cmake / mingw-w64-xi686-cmake.
    
    All the best,
    
       Mario
    
    
    
    > sure the native version would not do well with non-native POSIX-style
    > paths so I am not surprised by your results.  Anyhow, I suggest you
    > experiment with native versus POSIX cmake packages in both CMD and
    > bash (from msys2) environments to establish what the different results
    > are in those four cases for native Windows and POSIX paths.
    > 
    > Note I have no access to MinGW-w64/MSYS2 myself, but I do pay close
    > attention to this platform because it is the best Windows platform for
    > PLplot according to a fellow PLplot developer who does have a lot of
    > practical experience with this platform.
    > 
    > Alan
    > __________________________
    > Alan W. Irwin
    > 
    > Astronomical research affiliation with Department of Physics and Astronomy,
    > University of Victoria (astrowww.phys.uvic.ca).
    > 
    > Programming affiliations with the FreeEOS equation-of-state
    > implementation for stellar interiors (freeeos.sf.net); the Time
    > Ephemerides project (timeephem.sf.net); PLplot scientific plotting
    > software package (plplot.sf.net); the libLASi project
    > (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
    > and the Linux Brochure Project (lbproject.sf.net).
    > __________________________
    > 
    > Linux-powered Science
    > __________________________
    > 
    
    
    
    Viele Gruesse,
    
        Mario Emmenlauer
    
    
    --
    BioDataAnalysis GmbH, Mario Emmenlauer      Tel. Buero: +49-89-74677203
    Balanstr. 43                   mailto: memmenlauer * biodataanalysis.de
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