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#
# - Check if the system has the ANSI C files
# CHECK_HEADER_STDC
#
# 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
# Copyright (c) 2009, Michihiro NAKAJIMA
#
# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
MACRO (CHECK_HEADER_STDC)
IF(NOT DEFINED STDC_HEADERS)
IF(CMAKE_REQUIRED_INCLUDES)
SET(CHECK_HEADER_STDC_C_INCLUDE_DIRS "-DINCLUDE_DIRECTORIES=${CMAKE_REQUIRED_INCLUDES}")
ELSE(CMAKE_REQUIRED_INCLUDES)
SET(CHECK_HEADER_STDC_C_INCLUDE_DIRS)
ENDIF(CMAKE_REQUIRED_INCLUDES)
SET(MACRO_CHECK_HEADER_STDC_FLAGS ${CMAKE_REQUIRED_FLAGS})
MESSAGE(STATUS "Cheking for ANSI C header files")
TRY_RUN(CHECK_HEADER_STDC_result
CHECK_HEADER_STDC_compile_result
${CMAKE_BINARY_DIR}
${libarchive_SOURCE_DIR}/build/cmake/CheckHeaderSTDC.c
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_HEADER_STDC_FLAGS}
"${CHECK_HEADER_STDC_C_INCLUDE_DIRS}"
OUTPUT_VARIABLE OUTPUT)
IF(CHECK_HEADER_STDC_compile_result AND CHECK_HEADER_STDC_result EQUAL 0)
FIND_PATH(CHECK_HEADER_STDC_path "string.h")
IF (CHECK_HEADER_STDC_path)
FILE(STRINGS "${CHECK_HEADER_STDC_path}/string.h" CHECK_HEADER_STDC_result REGEX "[^a-zA-Z_]memchr[^a-zA-Z_]")
IF (CHECK_HEADER_STDC_result)
FILE(STRINGS "${CHECK_HEADER_STDC_path}/stdlib.h" CHECK_HEADER_STDC_result REGEX "[^a-zA-Z_]free[^a-zA-Z_]")
ENDIF (CHECK_HEADER_STDC_result)
ENDIF (CHECK_HEADER_STDC_path)
ENDIF(CHECK_HEADER_STDC_compile_result AND CHECK_HEADER_STDC_result EQUAL 0)
IF(CHECK_HEADER_STDC_result)
MESSAGE(STATUS "Cheking for ANSI C header files - found")
SET(STDC_HEADERS 1 CACHE INTERNAL "Have ANSI C headers")
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining if the include file ${INCLUDE} "
"exists passed with the following output:\n"
"${OUTPUT}\n\n")
ELSE(CHECK_HEADER_STDC_result)
MESSAGE(STATUS "Cheking for ANSI C header files - not found")
SET(STDC_HEADERS "" CACHE INTERNAL "Have ANSI C headers")
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if the include file ${INCLUDE} "
"exists failed with the following output:\n"
"${OUTPUT}\n\n")
ENDIF(CHECK_HEADER_STDC_result)
ENDIF(NOT DEFINED STDC_HEADERS)
ENDMACRO (CHECK_HEADER_STDC)
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