citra/dist/installer/CMakeLists.txt

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CMake
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if(WIN32)
set(PLATFORM "windows")
elseif(APPLE)
set(PLATFORM "mac")
elseif(UNIX)
set(PLATFORM "linux")
else()
message(FATAL_ERROR "Cannot build installer for this unsupported platform")
endif()
set(BUILD_DIR "${CMAKE_BINARY_DIR}/installer")
set(DIST_DIR "${BUILD_DIR}/dist")
set(TARGET_FILE "${DIST_DIR}/citra-setup-${PLATFORM}")
file(MAKE_DIRECTORY "${BUILD_DIR}" "${DIST_DIR}")
# Adds a custom target that will run the BuildInstaller.cmake file
# CMake can't just run a cmake function as a custom command, so this is a way around it.
# Calls the cmake command and runs a cmake file in "scripting" mode passing in variables with -D
add_custom_command(OUTPUT "${TARGET_FILE}"
COMMAND ${CMAKE_COMMAND}
-DBASE_DIR=${CMAKE_SOURCE_DIR}
-DSRC_DIR=${CMAKE_CURRENT_SOURCE_DIR}
-DBUILD_DIR=${BUILD_DIR}
-DTARGET_FILE=${TARGET_FILE}
-P ${CMAKE_SOURCE_DIR}/CMakeModules/BuildInstaller.cmake
WORKING_DIRECTORY ${BUILD_DIR}
)
add_custom_target(installer DEPENDS ${TARGET_FILE})