mirror of
https://github.com/reactos/CMake.git
synced 2024-11-24 03:59:58 +00:00
49 lines
2.0 KiB
CMake
49 lines
2.0 KiB
CMake
# - Check if the variable exists.
|
|
# CHECK_VARIABLE_EXISTS(VAR VARIABLE)
|
|
#
|
|
# VAR - the name of the variable
|
|
# VARIABLE - variable to store the result
|
|
#
|
|
# This macro is only for C variables.
|
|
#
|
|
# The following variables may be set before calling this macro to
|
|
# modify the way the check is run:
|
|
#
|
|
# CMAKE_REQUIRED_FLAGS = string of compile command line flags
|
|
# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
|
|
# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
|
|
|
|
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}")
|
|
ELSE(CMAKE_REQUIRED_LIBRARIES)
|
|
SET(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES)
|
|
ENDIF(CMAKE_REQUIRED_LIBRARIES)
|
|
TRY_COMPILE(${VARIABLE}
|
|
${CMAKE_BINARY_DIR}
|
|
${CMAKE_ROOT}/Modules/CheckVariableExists.c
|
|
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
|
|
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${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 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/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 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/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)
|