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-rw-r--r--Modules/CheckFunctionExists.cmake74
1 files changed, 74 insertions, 0 deletions
diff --git a/Modules/CheckFunctionExists.cmake b/Modules/CheckFunctionExists.cmake
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--- /dev/null
+++ b/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.)
+
+INCLUDE("${CMAKE_CURRENT_LIST_DIR}/CMakeExpandImportedTargets.cmake")
+
+
+MACRO(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
+ IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+ SET(MACRO_CHECK_FUNCTION_DEFINITIONS
+ "-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
+ MESSAGE(STATUS "Looking for ${FUNCTION}")
+ IF(CMAKE_REQUIRED_LIBRARIES)
+ # this one translates potentially used imported library targets to their files on disk
+ CMAKE_EXPAND_IMPORTED_TARGETS(_ADJUSTED_CMAKE_REQUIRED_LIBRARIES LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} CONFIGURATION "${CMAKE_TRY_COMPILE_CONFIGURATION}")
+ SET(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
+ "-DLINK_LIBRARIES:STRING=${_ADJUSTED_CMAKE_REQUIRED_LIBRARIES}")
+ ELSE(CMAKE_REQUIRED_LIBRARIES)
+ SET(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES)
+ ENDIF(CMAKE_REQUIRED_LIBRARIES)
+ IF(CMAKE_REQUIRED_INCLUDES)
+ SET(CHECK_FUNCTION_EXISTS_ADD_INCLUDES
+ "-DINCLUDE_DIRECTORIES:STRING=${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)