1*663afb9bSAndroid Build Coastguard Worker# - Check if _FILE_OFFSET_BITS macro needed for large files 2*663afb9bSAndroid Build Coastguard Worker# CHECK_FILE_OFFSET_BITS () 3*663afb9bSAndroid Build Coastguard Worker# 4*663afb9bSAndroid Build Coastguard Worker# The following variables may be set before calling this macro to 5*663afb9bSAndroid Build Coastguard Worker# modify the way the check is run: 6*663afb9bSAndroid Build Coastguard Worker# 7*663afb9bSAndroid Build Coastguard Worker# CMAKE_REQUIRED_FLAGS = string of compile command line flags 8*663afb9bSAndroid Build Coastguard Worker# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) 9*663afb9bSAndroid Build Coastguard Worker# CMAKE_REQUIRED_INCLUDES = list of include directories 10*663afb9bSAndroid Build Coastguard Worker# Copyright (c) 2009, Michihiro NAKAJIMA 11*663afb9bSAndroid Build Coastguard Worker# 12*663afb9bSAndroid Build Coastguard Worker# Redistribution and use is allowed according to the terms of the BSD license. 13*663afb9bSAndroid Build Coastguard Worker# For details see the accompanying COPYING-CMAKE-SCRIPTS file. 14*663afb9bSAndroid Build Coastguard Worker 15*663afb9bSAndroid Build Coastguard Worker#INCLUDE(CheckCSourceCompiles) 16*663afb9bSAndroid Build Coastguard Worker 17*663afb9bSAndroid Build Coastguard WorkerGET_FILENAME_COMPONENT(_selfdir_CheckFileOffsetBits 18*663afb9bSAndroid Build Coastguard Worker "${CMAKE_CURRENT_LIST_FILE}" PATH) 19*663afb9bSAndroid Build Coastguard Worker 20*663afb9bSAndroid Build Coastguard WorkerMACRO (CHECK_FILE_OFFSET_BITS) 21*663afb9bSAndroid Build Coastguard Worker IF(NOT DEFINED _FILE_OFFSET_BITS) 22*663afb9bSAndroid Build Coastguard Worker MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files") 23*663afb9bSAndroid Build Coastguard Worker TRY_COMPILE(__WITHOUT_FILE_OFFSET_BITS_64 24*663afb9bSAndroid Build Coastguard Worker ${CMAKE_CURRENT_BINARY_DIR} 25*663afb9bSAndroid Build Coastguard Worker ${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c 26*663afb9bSAndroid Build Coastguard Worker COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}) 27*663afb9bSAndroid Build Coastguard Worker IF(NOT __WITHOUT_FILE_OFFSET_BITS_64) 28*663afb9bSAndroid Build Coastguard Worker TRY_COMPILE(__WITH_FILE_OFFSET_BITS_64 29*663afb9bSAndroid Build Coastguard Worker ${CMAKE_CURRENT_BINARY_DIR} 30*663afb9bSAndroid Build Coastguard Worker ${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c 31*663afb9bSAndroid Build Coastguard Worker COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_FILE_OFFSET_BITS=64) 32*663afb9bSAndroid Build Coastguard Worker ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64) 33*663afb9bSAndroid Build Coastguard Worker 34*663afb9bSAndroid Build Coastguard Worker IF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) 35*663afb9bSAndroid Build Coastguard Worker SET(_FILE_OFFSET_BITS 64 CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files") 36*663afb9bSAndroid Build Coastguard Worker MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files - needed") 37*663afb9bSAndroid Build Coastguard Worker ELSE(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) 38*663afb9bSAndroid Build Coastguard Worker SET(_FILE_OFFSET_BITS "" CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files") 39*663afb9bSAndroid Build Coastguard Worker MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files - not needed") 40*663afb9bSAndroid Build Coastguard Worker ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) 41*663afb9bSAndroid Build Coastguard Worker ENDIF(NOT DEFINED _FILE_OFFSET_BITS) 42*663afb9bSAndroid Build Coastguard Worker 43*663afb9bSAndroid Build Coastguard WorkerENDMACRO (CHECK_FILE_OFFSET_BITS) 44