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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:
# 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()
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