Add tests Cross-compilation for windows.

CMake/Toolchain-mingw64.cmake

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+# Sample toolchain file for building for Windows from an Ubuntu Linux system.
+#
+# Typical usage:
+#    *) install cross compiler: `sudo apt-get install mingw-w64`
+#    *) cmake -H. -B_build_mingw -DCMAKE_TOOLCHAIN_FILE="${PWD}/toolchains/linux-mingw-w64.cmake"
+
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+set(TOOLCHAIN_PREFIX x86_64-w64-mingw32)
+
+# set compiler
+set(CMAKE_C_COMPILER   ${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++)
+set(CMAKE_RC_COMPILER  ${TOOLCHAIN_PREFIX}-windres)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libgcc -static-libstdc++ -static -lpthread")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -static-libgcc -static-libstdc++ -static -lpthread")
+
+
+# target environment on the build host system
+#   set 1st to dir with the cross compiler's C/C++ headers/libs
+set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX})
+
+# modify default behavior of FIND_XXX() commands to
+# search for headers/libs in the target environment and
+# search for programs in the build host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+# use emulator for `try_run` calls
+set(CMAKE_CROSSCOMPILING_EMULATOR wine64)
+
+# set c++ standard
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)

buildRelease.sh

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+#!/bin/bash
+mkdir build
+cd build
+cmake -DCMAKE_BUILD_TYPE=Release ..
+make -j9
+cd ..

buildWin32.sh

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+#!/bin/bash
+mkdir build
+cd build
+cmake -DCMAKE_TOOLCHAIN_FILE=CMake/Toolchain-mingw64.cmake ..
+make -j9
+cd ..

buildWin32Release.sh

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+#!/bin/bash
+mkdir build
+cd build
+cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=CMake/Toolchain-mingw64.cmake ..
+make -j9
+cd ..