50 lines
2 KiB
CMake
50 lines
2 KiB
CMake
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# Check if the system has the specified function; treat glibc "stub"
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# functions as nonexistent:
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# CHECK_FUNCTION_EXISTS_GLIBC (FUNCTION FUNCVAR)
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#
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# FUNCTION - the function(s) where the prototype should be declared
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# FUNCVAR - variable to define if the function does exist
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#
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# In particular, this understands the glibc convention of
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# defining macros __stub_XXXX or __stub___XXXX if the function
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# does appear in the library but is merely a stub that does nothing.
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# By detecting this case, we can select alternate behavior on
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# platforms that don't support this functionality.
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#
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# The following variables may be set before calling this macro to
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# modify the way the check is run:
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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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# Copyright (c) 2009, Michihiro NAKAJIMA
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#
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# Redistribution and use is allowed according to the terms of the BSD license.
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# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
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INCLUDE(CheckFunctionExists)
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GET_FILENAME_COMPONENT(_selfdir_CheckFunctionExistsGlibc
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"${CMAKE_CURRENT_LIST_FILE}" PATH)
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MACRO (CHECK_FUNCTION_EXISTS_GLIBC _FUNC _FUNCVAR)
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IF(NOT DEFINED ${_FUNCVAR})
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SET(CHECK_STUB_FUNC_1 "__stub_${_FUNC}")
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SET(CHECK_STUB_FUNC_2 "__stub___${_FUNC}")
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CONFIGURE_FILE( ${_selfdir_CheckFunctionExistsGlibc}/CheckFuncs_stub.c.in
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${CMAKE_CURRENT_BINARY_DIR}/cmake.tmp/CheckFuncs_stub.c IMMEDIATE)
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TRY_COMPILE(__stub
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${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_BINARY_DIR}/cmake.tmp/CheckFuncs_stub.c
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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CMAKE_FLAGS
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-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS}
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"${CHECK_INCLUDE_FILE_C_INCLUDE_DIRS}")
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IF (__stub)
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SET("${_FUNCVAR}" "" CACHE INTERNAL "Have function ${_FUNC}")
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ELSE (__stub)
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CHECK_FUNCTION_EXISTS("${_FUNC}" "${_FUNCVAR}")
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ENDIF (__stub)
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ENDIF(NOT DEFINED ${_FUNCVAR})
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ENDMACRO (CHECK_FUNCTION_EXISTS_GLIBC)
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