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extern/cmake/2.85/share/cmake-2.8/Modules/CheckFunctionExists.cmake

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+# - Check if a C function can be linked
+# CHECK_FUNCTION_EXISTS(<function> <variable>)
+#
+# Check that the <function> is provided by libraries on the system and
+# store the result in a <variable>.  This does not verify that any
+# system header file declares the function, only that it can be found
+# at link time (considure using CheckSymbolExists).
+#
+# 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
+
+#=============================================================================
+# Copyright 2002-2011 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+MACRO(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
+  IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+    SET(MACRO_CHECK_FUNCTION_DEFINITIONS 
+      "-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
+    MESSAGE(STATUS "Looking for ${FUNCTION}")
+    IF(CMAKE_REQUIRED_LIBRARIES)
+      SET(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
+        "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
+    ELSE(CMAKE_REQUIRED_LIBRARIES)
+      SET(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES)
+    ENDIF(CMAKE_REQUIRED_LIBRARIES)
+    IF(CMAKE_REQUIRED_INCLUDES)
+      SET(CHECK_FUNCTION_EXISTS_ADD_INCLUDES
+        "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
+    ELSE(CMAKE_REQUIRED_INCLUDES)
+      SET(CHECK_FUNCTION_EXISTS_ADD_INCLUDES)
+    ENDIF(CMAKE_REQUIRED_INCLUDES)
+    TRY_COMPILE(${VARIABLE}
+      ${CMAKE_BINARY_DIR}
+      ${CMAKE_ROOT}/Modules/CheckFunctionExists.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+      CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
+      "${CHECK_FUNCTION_EXISTS_ADD_LIBRARIES}"
+      "${CHECK_FUNCTION_EXISTS_ADD_INCLUDES}"
+      OUTPUT_VARIABLE OUTPUT)
+    IF(${VARIABLE})
+      SET(${VARIABLE} 1 CACHE INTERNAL "Have function ${FUNCTION}")
+      MESSAGE(STATUS "Looking for ${FUNCTION} - found")
+      FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log 
+        "Determining if the function ${FUNCTION} exists passed with the following output:\n"
+        "${OUTPUT}\n\n")
+    ELSE(${VARIABLE})
+      MESSAGE(STATUS "Looking for ${FUNCTION} - not found")
+      SET(${VARIABLE} "" CACHE INTERNAL "Have function ${FUNCTION}")
+      FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log 
+        "Determining if the function ${FUNCTION} exists failed with the following output:\n"
+        "${OUTPUT}\n\n")
+    ENDIF(${VARIABLE})
+  ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+ENDMACRO(CHECK_FUNCTION_EXISTS)