| # 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++ |
| |
| .. code-block:: cmake |
| |
| CHECK_CXX_SYMBOL_EXISTS(<symbol> <files> <variable>) |
| |
| Check that the ``<symbol>`` is available after including given header |
| ``<files>`` and store the result in a ``<variable>``. 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_guard(GLOBAL) |
| include(CheckSymbolExists) |
| |
| macro(CHECK_CXX_SYMBOL_EXISTS SYMBOL FILES VARIABLE) |
| __CHECK_SYMBOL_EXISTS_IMPL("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.cxx" "${SYMBOL}" "${FILES}" "${VARIABLE}" ) |
| endmacro() |