38 lines
1.6 KiB
CMake
38 lines
1.6 KiB
CMake
#
|
|
# Check if the variable exists.
|
|
# # CHECK_VARIABLE_EXISTS - macro which checks if the variable exists
|
|
# VAR - the name of the variable
|
|
# VARIABLE - variable to store the result
|
|
#
|
|
|
|
MACRO(CHECK_VARIABLE_EXISTS VAR VARIABLE)
|
|
IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
|
|
SET(MACRO_CHECK_VARIABLE_DEFINITIONS
|
|
"-DCHECK_VARIABLE_EXISTS=${VAR} ${CMAKE_REQUIRED_FLAGS}")
|
|
MESSAGE(STATUS "Looking for ${VAR}")
|
|
IF(CMAKE_REQUIRED_LIBRARIES)
|
|
SET(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES
|
|
"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
|
|
ENDIF(CMAKE_REQUIRED_LIBRARIES)
|
|
TRY_COMPILE(${VARIABLE}
|
|
${CMAKE_BINARY_DIR}
|
|
${CMAKE_ROOT}/Modules/CheckVariableExists.c
|
|
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS}
|
|
"${CHECK_VARIABLE_EXISTS_ADD_LIBRARIES}"
|
|
OUTPUT_VARIABLE OUTPUT)
|
|
IF(${VARIABLE})
|
|
SET(${VARIABLE} 1 CACHE INTERNAL "Have variable ${VAR}")
|
|
MESSAGE(STATUS "Looking for ${VAR} - found")
|
|
FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log
|
|
"Determining if the variable ${VAR} exists passed with the following output:\n"
|
|
"${OUTPUT}\n\n")
|
|
ELSE(${VARIABLE})
|
|
SET(${VARIABLE} "" CACHE INTERNAL "Have variable ${VAR}")
|
|
MESSAGE(STATUS "Looking for ${VAR} - not found")
|
|
FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log
|
|
"Determining if the variable ${VAR} exists failed with the following output:\n"
|
|
"${OUTPUT}\n\n")
|
|
ENDIF(${VARIABLE})
|
|
ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
|
|
ENDMACRO(CHECK_VARIABLE_EXISTS)
|