[CMake] cmake on MinGW64; which generator

[Cristian Adam]

Hi,

You are most probably using MSys2, which means that you are using CMake
from MSys2,
and they patch CMake for their platform. This also means that CMake
upstream doesn't support it.

Here <https://paste.ubuntu.com/p/ypnMXfdK6t/> are the differences between
upstream CMake 3.14.3 and MSys2 CMake 3.14.3. No idea why
the MSys2 people didn't try to upstream this into CMake.

In this case you should get support from MSys2 people, or switch to upstream
CMake <https://cmake.org/download/> and standalone MinGW-w64
<https://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/8.1.0/threads-posix/>
.

Alternatively you can try using the Ninja generator.

The problem with standalone MinGW-w64 is that you will not have the number
of libraries that MSys2 offers.
You can use a CMake package manager like Conan, or Hunter to obtain those
libraries.

I know this because when I tried to compile Qt6::Base with MSys2 I was not
able to compile, due to
various Msys2 problems. With upstream CMake, standalone MinGW-w64 and
Hunter 3rd party libraries
everything worked just fine. At https://bugreports.qt.io/browse/QTBUG-75578
I described how I compiled Qt6::Base.

Cheers,
Cristian.


On Sun, Jun 23, 2019 at 3:49 PM Christopher Webster <cjw at ucar.edu> wrote:

> Greetings,
>
>   I am trying to figure out which generator to use on MinGW64 on Windows10, the 2-3 I have tried fail.
>
> cmake version is 3.14.5
>
>
> If I try "Unix Makefiles" I get:
>
> $ cmake -S coin -B coin_build -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=C:\Tools\Packages\Coin3D
> -- The C compiler identification is GNU 9.1.0
> -- The CXX compiler identification is GNU 9.1.0
> System is unknown to cmake, create:
> Platform/MINGW64_NT-10.0-17763 to use this system, please send your
> config file to cmake at www.cmake.org so it can be added to cmake
>
>
>
> If I try "MinGW Makefiles" I get:
>
> $ cmake -S coin -B coin_build -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=C:\Tools\Packages\Coin3D
> CMake Error: Could not create named generator MinGW Makefiles
>
> Generators
> * Unix Makefiles               = Generates standard UNIX makefiles.
>   Ninja                        = Generates build.ninja files.
>   CodeBlocks - Ninja           = Generates CodeBlocks project files.
>   CodeBlocks - Unix Makefiles  = Generates CodeBlocks project files.
>   CodeLite - Ninja             = Generates CodeLite project files.
>   CodeLite - Unix Makefiles    = Generates CodeLite project files.
>   Sublime Text 2 - Ninja       = Generates Sublime Text 2 project files.
>   Sublime Text 2 - Unix Makefiles
>                                = Generates Sublime Text 2 project files.
>   Kate - Ninja                 = Generates Kate project files.
>   Kate - Unix Makefiles        = Generates Kate project files.
>   Eclipse CDT4 - Ninja         = Generates Eclipse CDT 4.0 project files.
>   Eclipse CDT4 - Unix Makefiles= Generates Eclipse CDT 4.0 project files
>
>
> Thanks for any guidance.
>
> Chris
>
>
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