# Distributed under the OSI-approved BSD 3-Clause License. See accompanying # file Copyright.txt or https://cmake.org/licensing for details. #.rst: # CheckCXXSymbolExists # -------------------- # # Check if a symbol exists as a function, variable, or macro in C++ # # CHECK_CXX_SYMBOL_EXISTS( ) # # Check that the is available after including given header # and store the result in a . Specify the list of # files in one argument as a semicolon-separated list. # CHECK_CXX_SYMBOL_EXISTS() can be used to check in C++ files, as # opposed to CHECK_SYMBOL_EXISTS(), which works only for C. # # If the header files define the symbol as a macro it is considered # available and assumed to work. If the header files declare the symbol # as a function or variable then the symbol must also be available for # linking. If the symbol is a type or enum value it will not be # recognized (consider using CheckTypeSize or CheckCSourceCompiles). # # 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_INCLUDES = list of include directories # CMAKE_REQUIRED_LIBRARIES = list of libraries to link # CMAKE_REQUIRED_QUIET = execute quietly without messages include(CheckSymbolExists) macro(CHECK_CXX_SYMBOL_EXISTS SYMBOL FILES VARIABLE) _CHECK_SYMBOL_EXISTS("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.cxx" "${SYMBOL}" "${FILES}" "${VARIABLE}" ) endmacro()