40 lines
1.6 KiB
CMake
40 lines
1.6 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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#
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# Check if a symbol exists as a function, variable, or macro in C++
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#
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# CHECK_CXX_SYMBOL_EXISTS(<symbol> <files> <variable>)
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#
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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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#
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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 CheckTypeSize or CheckCSourceCompiles).
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#
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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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#
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# ::
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#
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# CMAKE_REQUIRED_FLAGS = string of compile command line flags
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# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
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# CMAKE_REQUIRED_INCLUDES = list of include directories
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# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
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# CMAKE_REQUIRED_QUIET = execute quietly without messages
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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("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.cxx" "${SYMBOL}" "${FILES}" "${VARIABLE}" )
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endmacro()
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