FindMono.cmake

# Copyright 2021 Google
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Locates the Mono launcher and build tool.
#
# Optional variable arguments for this module:
# MONO_DIR: Variable to specify a search path for Mono.
# MONO_DISABLE_VISUAL_STUDIO_FALLBACK: Do not use Visual Studio's msbuild
# as a fallback on Windows when using the Visual Studio project generator.
#
# Cache variables set by this module:
# MONO_EXE: Location of the Mono interpreter executable.
# MONO_VERSION: Version of the detected Mono installation.
# MONO_CSHARP_BUILD_EXE: Location of the tool (e.g msbuild or xbuild) that
# can build .csproj projects.

# If MONO_DIR is specified, only search that path.
set(FIND_MONO_OPTIONS "")
if(EXISTS"${MONO_DIR}")
 set(FIND_MONO_OPTIONS
PATHS
"${MONO_DIR}"
"${MONO_DIR}/lib/mono"
PATH_SUFFIXES
 bin
 NO_DEFAULT_PATH
 )
endif()

# Search for Mono tools.
find_program(MONO_EXE mono
${FIND_MONO_OPTIONS}
)
find_program(MONO_CSHARP_BUILD_EXE
NAMES
 msbuild
 xbuild
${FIND_MONO_OPTIONS}
)

if(CMAKE_HOST_WIN32AND
NOT MONO_DISABLE_VISUAL_STUDIO_FALLBACK AND
EXISTS"${CMAKE_VS_MSBUILD_COMMAND}")
 if(NOT MONO_CSHARP_BUILD_EXE)
# If Mono's build tool isn't found, fallback to Visual Studio.
 message(STATUS"Mono installation not found, trying to fallback "
"to Visual Studio's msbuild ${CMAKE_VS_MSBUILD_COMMAND}."
 )
 set(MONO_CSHARP_BUILD_EXE "${CMAKE_VS_MSBUILD_COMMAND}"
CACHESTRING"" FORCE
 )
 endif()
 if(NOT MONO_EXE)
# Just use cmake to launch the C# executable which should run on Windows if
# the .NET framework is installed.
# NOTE: This does not use cmd as CTest passes a path with / path separators
# to CreateProcess() causing cmd to fail to start.
 set(MONO_EXE "${CMAKE_COMMAND};-E;env"CACHESTRING"" FORCE)
 endif()
endif()

# If the mono executable is found, and retrieve the version.
if(MONO_EXE)
 if(EXISTS"${MONO_EXE}")
 execute_process(
COMMAND${MONO_EXE} -V
OUTPUT_VARIABLE MONO_VERSION_STRING
RESULT_VARIABLE RESULT
 )
 if(NOT${RESULT}EQUAL"0")
 message(FATAL_ERROR "${MONO_EXE} -V returned ${RESULT}.")
 endif()
 string(REGEX MATCH "([0-9]*)([.])([0-9]*)([.]*)([0-9]*)"
 MONO_VERSION_MATCH "${MONO_VERSION_STRING}")
 set(MONO_VERSION "${MONO_VERSION_MATCH}"CACHESTRING"Mono version.")
 else()
 set(MONO_VERSION "0.0.0"CACHESTRING"Mono version.")
 endif()
endif()

if(NOT MONO_EXE ORNOT MONO_CSHARP_BUILD_EXE)
 message(FATAL_ERROR "Cannot find mono and msbuild/xbuild executables.")
endif()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(
 Mono
 DEFAULT_MSG
 MONO_EXE
 MONO_CSHARP_BUILD_EXE
 MONO_VERSION
)
mark_as_advanced(
 MONO_EXE
 MONO_CSHARP_BUILD_EXE
 MONO_VERSION
)