Check if a C function can be linked
check_function_exists check_function_exists(<function> <variable>)
Checks that the <function> is provided by libraries on the system and store the result in a <variable>, which will be created as an internal cache variable.
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 a ;-list of macros to define (-DFOO=bar).
CMAKE_REQUIRED_INCLUDES a ;-list of header search paths to pass to the compiler.
CMAKE_REQUIRED_LINK_OPTIONS a ;-list of options to add to the link command.
CMAKE_REQUIRED_LIBRARIES a ;-list of libraries to add to the link command. See policy CMP0075.
CMAKE_REQUIRED_QUIET execute quietly without messages.
Note
Prefer using CheckSymbolExists instead of this module, for the following reasons:
check_function_exists() can’t detect functions that are inlined in headers or specified as a macro.check_function_exists() can’t detect anything in the 32-bit versions of the Win32 API, because of a mismatch in calling conventions.check_function_exists() only verifies linking, it does not verify that the function is declared in system headers.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/module/CheckFunctionExists.html