You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
2.4 KiB
74 lines
2.4 KiB
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
|
|
# file Copyright.txt or https://cmake.org/licensing for details.
|
|
|
|
#.rst:
|
|
# CheckVariableExists
|
|
# -------------------
|
|
#
|
|
# Check if the variable exists.
|
|
#
|
|
# ::
|
|
#
|
|
# CHECK_VARIABLE_EXISTS(VAR VARIABLE)
|
|
#
|
|
#
|
|
#
|
|
# ::
|
|
#
|
|
# VAR - the name of the variable
|
|
# VARIABLE - variable to store the result
|
|
# Will be created as an internal cache variable.
|
|
#
|
|
#
|
|
# 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
|
|
# CMAKE_REQUIRED_QUIET = execute quietly without messages
|
|
|
|
macro(CHECK_VARIABLE_EXISTS VAR VARIABLE)
|
|
if(NOT DEFINED "${VARIABLE}")
|
|
set(MACRO_CHECK_VARIABLE_DEFINITIONS
|
|
"-DCHECK_VARIABLE_EXISTS=${VAR} ${CMAKE_REQUIRED_FLAGS}")
|
|
if(NOT CMAKE_REQUIRED_QUIET)
|
|
message(STATUS "Looking for ${VAR}")
|
|
endif()
|
|
if(CMAKE_REQUIRED_LIBRARIES)
|
|
set(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES
|
|
LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
|
|
else()
|
|
set(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES)
|
|
endif()
|
|
try_compile(${VARIABLE}
|
|
${CMAKE_BINARY_DIR}
|
|
${CMAKE_ROOT}/Modules/CheckVariableExists.c
|
|
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
|
|
${CHECK_VARIABLE_EXISTS_ADD_LIBRARIES}
|
|
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS}
|
|
OUTPUT_VARIABLE OUTPUT)
|
|
if(${VARIABLE})
|
|
set(${VARIABLE} 1 CACHE INTERNAL "Have variable ${VAR}")
|
|
if(NOT CMAKE_REQUIRED_QUIET)
|
|
message(STATUS "Looking for ${VAR} - found")
|
|
endif()
|
|
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()
|
|
set(${VARIABLE} "" CACHE INTERNAL "Have variable ${VAR}")
|
|
if(NOT CMAKE_REQUIRED_QUIET)
|
|
message(STATUS "Looking for ${VAR} - not found")
|
|
endif()
|
|
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()
|
|
endif()
|
|
endmacro()
|