build proccess broken on MSYS2

[FrostKiwi]

CMAKE OUTPUT of "cmake -DENABLE_UNIT_TESTS=OFF -DENABLE_FUNC_TESTS=OFF .."

-- The C compiler identification is GNU 11.2.0
-- The CXX compiler identification is GNU 11.2.0
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Detecting C compiler ABI info
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /mingw64/bin/cc.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /mingw64/bin/CC.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Setting build type to 'Release' as none was specified.
-- Looking for nlohman_json dependency
-- Looking for nlohman_json dependency -- not found
-- Looking for fmt dependency
-- Looking for fmt dependency -- found
-- Looking for spdlog dependency
-- Looking for pthread.h
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE  
-- Looking for spdlog dependency -- found
-- Looking for gRPC::grpc++ dependency
-- Found PkgConfig: /mingw64/bin/pkg-config.exe (found version "1.8.0") 
-- Checking for modules 'protobuf>=3.11;grpc++>=1.26'
--   Found protobuf, version 3.16.0.0
--   Found grpc++, version 1.35.0
-- Looking for gRPC::grpc++ dependency -- found
-- Looking for protoc
-- Looking for protoc -- found
-- Looking for grpc_cpp_plugin
-- Looking for grpc_cpp_plugin -- found
-- Configuring done
-- Generating done
-- Build files have been written to: /home/Bayonetta2.0/new-horizon/lbs/Bear/build

MAKE OUTPUT of "make all"

[  0%] Built target grpc_dependency
[  0%] Built target googletest_dependency
[  5%] Creating directories for 'nlohmann_json_dependency'
[ 11%] Performing download step (download, verify and extract) for 'nlohmann_json_dependency'
-- Downloading...
   dst='/home/Bayonetta2.0/new-horizon/lbs/Bear/build/subprojects/Download/nlohmann_json_dependency/v3.10.4.tar.gz'
   timeout='none'
   inactivity timeout='none'
-- Using src='https://github.com/nlohmann/json/archive/v3.10.4.tar.gz'
-- verifying file...
       file='/home/Bayonetta2.0/new-horizon/lbs/Bear/build/subprojects/Download/nlohmann_json_dependency/v3.10.4.tar.gz'
-- Downloading... done
-- extracting...
     src='/home/Bayonetta2.0/new-horizon/lbs/Bear/build/subprojects/Download/nlohmann_json_dependency/v3.10.4.tar.gz'
     dst='/home/Bayonetta2.0/new-horizon/lbs/Bear/build/subprojects/Source/nlohmann_json_dependency'
-- extracting... [tar xfz]
-- extracting... [analysis]
-- extracting... [rename]
-- extracting... [clean up]
-- extracting... done
[ 17%] No update step for 'nlohmann_json_dependency'
[ 23%] No patch step for 'nlohmann_json_dependency'
[ 29%] Performing configure step for 'nlohmann_json_dependency'
-- nlohmann_json_dependency configure command succeeded.  See also /home/Bayonetta2.0/new-horizon/lbs/Bear/build/subprojects/Stamp/nlohmann_json_dependency/nlohmann_json_dependency-configure-*.log
[ 35%] Performing build step for 'nlohmann_json_dependency'
-- nlohmann_json_dependency build command succeeded.  See also /home/Bayonetta2.0/new-horizon/lbs/Bear/build/subprojects/Stamp/nlohmann_json_dependency/nlohmann_json_dependency-build-*.log
[ 41%] Performing install step for 'nlohmann_json_dependency'
-- nlohmann_json_dependency install command succeeded.  See also /home/Bayonetta2.0/new-horizon/lbs/Bear/build/subprojects/Stamp/nlohmann_json_dependency/nlohmann_json_dependency-install-*.log
[ 47%] Completed 'nlohmann_json_dependency'
[ 47%] Built target nlohmann_json_dependency
[ 47%] Built target fmt_dependency
[ 47%] Built target spdlog_dependency
[ 52%] Creating directories for 'BearSource'
[ 58%] No download step for 'BearSource'
[ 64%] No update step for 'BearSource'
[ 70%] No patch step for 'BearSource'
[ 76%] Performing configure step for 'BearSource'
loading initial cache file /home/Bayonetta2.0/new-horizon/lbs/Bear/build/subprojects/tmp/BearSource/BearSource-cache-Release.cmake
-- The C compiler identification is GNU 11.2.0
-- The CXX compiler identification is GNU 11.2.0
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Detecting C compiler ABI info
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /mingw64/bin/cc.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /mingw64/bin/CC.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE  
-- Found nlohmann_json: /home/Bayonetta2.0/new-horizon/lbs/Bear/build/subprojects/Install/nlohmann_json_dependency/lib/cmake/nlohmann_json/nlohmann_jsonConfig.cmake (found version "3.10.4") 
-- Found PkgConfig: /mingw64/bin/pkg-config.exe (found version "1.8.0") 
-- Checking for modules 'protobuf;grpc++'
--   Found protobuf, version 3.16.0.0
--   Found grpc++, version 1.35.0
-- Looking for spawn.h
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for spawn.h - not found
-- Looking for unistd.h
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for unistd.h - found
-- Looking for dlfcn.h
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for dlfcn.h - found
-- Looking for errno.h
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for errno.h - found
-- Looking for sys/utsname.h
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for sys/utsname.h - not found
-- Looking for sys/wait.h
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for sys/wait.h - not found
-- Looking for sys/time.h
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for sys/time.h - found
-- Looking for gnu/lib-names.h
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for gnu/lib-names.h - not found
-- Looking for _NSGetEnviron
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for _NSGetEnviron - not found
-- Looking for dlopen
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for dlopen - found
-- Looking for dlsym
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for dlsym - found
-- Looking for dlerror
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for dlerror - found
-- Looking for dlclose
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for dlclose - found
-- Looking for RTLD_NEXT
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for RTLD_NEXT - found
-- Looking for EACCES
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for EACCES - found
-- Looking for ENOENT
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for ENOENT - found
-- Looking for strerror_r
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for strerror_r - not found
-- Looking for environ
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for environ - not found
-- Looking for uname
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for uname - not found
-- Looking for confstr
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for confstr - not found
-- Looking for _CS_PATH
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for _CS_PATH - not found
-- Looking for _CS_GNU_LIBC_VERSION
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for _CS_GNU_LIBC_VERSION - not found
-- Looking for _CS_GNU_LIBPTHREAD_VERSION
System is unknown to cmake, create:
Platform/MINGW64_NT-10.0-19043 to use this system, please post your config file on discourse.cmake.org so it can be added to cmake
-- Looking for _CS_GNU_LIBPTHREAD_VERSION - not found
-- Looking for protoc ... /mingw64/bin/protoc.exe
-- Looking for grpc_cpp_plugin ... /mingw64/bin/grpc_cpp_plugin.exe
-- Configuring done
CMake Error in intercept/CMakeLists.txt:
  Target "rpc_a" contains relative path in its INTERFACE_INCLUDE_DIRECTORIES:

    "C:/msys64/mingw64/include"


CMake Error in intercept/CMakeLists.txt:
  Target "rpc_a" contains relative path in its INTERFACE_INCLUDE_DIRECTORIES:

    "C:/msys64/mingw64/include"


CMake Error in intercept/CMakeLists.txt:
  Target "domain_a" contains relative path in its
  INTERFACE_INCLUDE_DIRECTORIES:

    "C:/msys64/mingw64/include"


CMake Error in intercept/CMakeLists.txt:
  Target "intercept_a" contains relative path in its
  INTERFACE_INCLUDE_DIRECTORIES:

    "C:/msys64/mingw64/include"


CMake Error in intercept/CMakeLists.txt:
  Target "domain_a" contains relative path in its
  INTERFACE_INCLUDE_DIRECTORIES:

    "C:/msys64/mingw64/include"


CMake Error in intercept/CMakeLists.txt:
  Target "wrapper_a" contains relative path in its
  INTERFACE_INCLUDE_DIRECTORIES:

    "C:/msys64/mingw64/include"


CMake Error in intercept/proto/CMakeLists.txt:
  Target "PkgConfig::gRPC" contains relative path in its
  INTERFACE_INCLUDE_DIRECTORIES:

    "C:/msys64/mingw64/include"


CMake Error in citnames/CMakeLists.txt:
  Target "events_db_a" contains relative path in its
  INTERFACE_INCLUDE_DIRECTORIES:

    "C:/msys64/mingw64/include"


CMake Error in citnames/CMakeLists.txt:
  Target "citnames_a" contains relative path in its
  INTERFACE_INCLUDE_DIRECTORIES:

    "C:/msys64/mingw64/include"


-- Generating done
CMake Generate step failed.  Build files cannot be regenerated correctly.
make[2]: *** [CMakeFiles/BearSource.dir/build.make:95: subprojects/Stamp/BearSource/BearSource-configure] Error 1
make[1]: *** [CMakeFiles/Makefile2:174: CMakeFiles/BearSource.dir/all] Error 2
make: *** [Makefile:156: all] Error 2

Describe the bug
Building Bear on MSYS2 with the MinGW64-GCC Toolchain fails with the errors CMake Error [...] Target [...] contains relative path in its INTERFACE_INCLUDE_DIRECTORIES: [...] , see logs above. The build process up to that point runs flawlessly. This was initially reported here: #294
The GNU Toolchain on Windows is available via the "MinGW64" project. To build and program stuff you go through a Unix environment for windows called "MSYS2" which provides the package manager Pacman, like with Arch Linux. Via that environment you install the MinGW64 toolchain, basically a port of GCC for 64-bit Windows, which supports the Windows API.

I wonder if this has to do with the fact, that cmake does not list MinGW Makefiles as an option with bear's cmake files, hence the Cmake warning Platform/MINGW64_NT-10.0-19043 to use this system [...] I expect it to be listed as an "cmake -G" option, but maybe I am confusing stuff. It should work with the default cmake "Unix Makefiles" just fine...

I am a happy user of Emacs + LSP Clangd to program on my FreeBSD machine. To get the compilation commands for LSP ready, I use Bear. Due to the need of my program running on Windows, and MinGW64 support for cross-compilation being good on Linux, but bad on FreeBSD, I am forced build my stuff on a Windows 10 machine. Everything works flawlessly, except for the Bear build process.

To Reproduce
Build with MSYS2 MinGW64 GCC toolchain

Expected behavior
Build without errors

Environment:

• OS name: Windows 10 - MSYS2 - MSYS_NT-10.0-19043
• OS architecture: x86_64
• Bear version: git master on 2021-11-11
• Bear install method: Build from source

[FrostKiwi]

Ups, I had the wrong cmake installed.
Turns out I had used msys/cmake and not mingw64/cmake and the system did not notify me of that. Indeed, the missing -G options should have tipped me off.
I now have the same problem as: msys2/MINGW-packages#7411