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54 lines
2.2 KiB
CMake
54 lines
2.2 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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CheckCXXSymbolExists
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--------------------
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Check if a symbol exists as a function, variable, or macro in C++
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.. command:: CHECK_CXX_SYMBOL_EXISTS
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.. code-block:: cmake
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CHECK_CXX_SYMBOL_EXISTS(<symbol> <files> <variable>)
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Check that the ``<symbol>`` is available after including given header
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``<files>`` and store the result in a ``<variable>``. Specify the list of
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files in one argument as a semicolon-separated list.
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``CHECK_CXX_SYMBOL_EXISTS()`` can be used to check in C++ files, as
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opposed to ``CHECK_SYMBOL_EXISTS()``, which works only for ``C``.
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If the header files define the symbol as a macro it is considered
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available and assumed to work. If the header files declare the symbol
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as a function or variable then the symbol must also be available for
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linking. If the symbol is a type or enum value it will not be
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recognized (consider using :module:`CheckTypeSize`
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or :module:`CheckCSourceCompiles`).
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The following variables may be set before calling this macro to modify
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the way the check is run:
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``CMAKE_REQUIRED_FLAGS``
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string of compile command line flags.
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``CMAKE_REQUIRED_DEFINITIONS``
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a :ref:`;-list <CMake Language Lists>` of macros to define (-DFOO=bar).
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``CMAKE_REQUIRED_INCLUDES``
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a :ref:`;-list <CMake Language Lists>` of header search paths to pass to
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the compiler.
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``CMAKE_REQUIRED_LINK_OPTIONS``
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a :ref:`;-list <CMake Language Lists>` of options to add to the link command.
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``CMAKE_REQUIRED_LIBRARIES``
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a :ref:`;-list <CMake Language Lists>` of libraries to add to the link
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command. See policy :policy:`CMP0075`.
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``CMAKE_REQUIRED_QUIET``
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execute quietly without messages.
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#]=======================================================================]
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include_guard(GLOBAL)
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include(CheckSymbolExists)
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macro(CHECK_CXX_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
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__CHECK_SYMBOL_EXISTS_IMPL("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.cxx" "${SYMBOL}" "${FILES}" "${VARIABLE}" )
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endmacro()
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