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# 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. .. command:: CHECK_VARIABLE_EXISTS .. code-block:: cmake 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_LINK_OPTIONS`` .. versionadded:: 3.14 list of options to pass to link command. ``CMAKE_REQUIRED_LIBRARIES`` list of libraries to link. ``CMAKE_REQUIRED_QUIET`` .. versionadded:: 3.1 execute quietly without messages. #]=======================================================================] include_guard(GLOBAL) 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(CHECK_START "Looking for ${VAR}") endif() if(CMAKE_REQUIRED_LINK_OPTIONS) set(CHECK_VARIABLE_EXISTS_ADD_LINK_OPTIONS LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS}) else() set(CHECK_VARIABLE_EXISTS_ADD_LINK_OPTIONS) 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} SOURCES ${CMAKE_ROOT}/Modules/CheckVariableExists.c COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} ${CHECK_VARIABLE_EXISTS_ADD_LINK_OPTIONS} ${CHECK_VARIABLE_EXISTS_ADD_LIBRARIES} CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS} ) if(${VARIABLE}) set(${VARIABLE} 1 CACHE INTERNAL "Have variable ${VAR}") if(NOT CMAKE_REQUIRED_QUIET) message(CHECK_PASS "found") endif() else() set(${VARIABLE} "" CACHE INTERNAL "Have variable ${VAR}") if(NOT CMAKE_REQUIRED_QUIET) message(CHECK_FAIL "not found") endif() endif() endif() endmacro()