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# - Check if the source code provided in the SOURCE argument compiles.
# CURL_CHECK_C_SOURCE_COMPILES(SOURCE VAR)
# - macro which checks if the source code compiles
# SOURCE - source code to try to compile
# VAR - variable to store whether the source code compiled
#
# 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
MACRO(CURL_CHECK_C_SOURCE_COMPILES SOURCE VAR)
IF(NOT DEFINED ${VAR} OR ${VAR} MATCHES "UNKNOWN")
SET(message "${VAR}")
# If the number of arguments is greater than 2 (SOURCE VAR)
IF(${ARGC} GREATER 2)
# then add the third argument as a message
SET(message "${ARGV2} (${VAR})")
ENDIF(${ARGC} GREATER 2)
SET(MACRO_CHECK_FUNCTION_DEFINITIONS
"-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
IF(CMAKE_REQUIRED_LIBRARIES)
SET(CURL_CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES
"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
ELSE(CMAKE_REQUIRED_LIBRARIES)
SET(CURL_CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES)
ENDIF(CMAKE_REQUIRED_LIBRARIES)
IF(CMAKE_REQUIRED_INCLUDES)
SET(CURL_CHECK_C_SOURCE_COMPILES_ADD_INCLUDES
"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
ELSE(CMAKE_REQUIRED_INCLUDES)
SET(CURL_CHECK_C_SOURCE_COMPILES_ADD_INCLUDES)
ENDIF(CMAKE_REQUIRED_INCLUDES)
SET(src "")
FOREACH(def ${EXTRA_DEFINES})
SET(src "${src}#define ${def} 1\n")
ENDFOREACH(def)
FOREACH(inc ${HEADER_INCLUDES})
SET(src "${src}#include <${inc}>\n")
ENDFOREACH(inc)
SET(src "${src}\nint main() { ${SOURCE} ; return 0; }")
SET(CMAKE_CONFIGURABLE_FILE_CONTENT "${src}")
CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/CMake/CMakeConfigurableFile.in
"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c")
MESSAGE(STATUS "Performing Test ${message}")
TRY_COMPILE(${VAR}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
"${CURL_CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES}"
"${CURL_CHECK_C_SOURCE_COMPILES_ADD_INCLUDES}"
OUTPUT_VARIABLE OUTPUT)
IF(${VAR})
SET(${VAR} 1 CACHE INTERNAL "Test ${message}")
MESSAGE(STATUS "Performing Test ${message} - Success")
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Performing C SOURCE FILE Test ${message} succeded with the following output:\n"
"${OUTPUT}\n"
"Source file was:\n${src}\n")
ELSE(${VAR})
MESSAGE(STATUS "Performing Test ${message} - Failed")
SET(${VAR} "" CACHE INTERNAL "Test ${message}")
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Performing C SOURCE FILE Test ${message} failed with the following output:\n"
"${OUTPUT}\n"
"Source file was:\n${src}\n")
ENDIF(${VAR})
ENDIF()
ENDMACRO(CURL_CHECK_C_SOURCE_COMPILES)
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