1*a466cc55SCy Schubert# - Check if _FILE_OFFSET_BITS macro needed for large files 2*a466cc55SCy Schubert# CHECK_FILE_OFFSET_BITS () 3*a466cc55SCy Schubert# 4*a466cc55SCy Schubert# The following variables may be set before calling this macro to 5*a466cc55SCy Schubert# modify the way the check is run: 6*a466cc55SCy Schubert# 7*a466cc55SCy Schubert# CMAKE_REQUIRED_FLAGS = string of compile command line flags 8*a466cc55SCy Schubert# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) 9*a466cc55SCy Schubert# CMAKE_REQUIRED_INCLUDES = list of include directories 10*a466cc55SCy Schubert# Copyright (c) 2009, Michihiro NAKAJIMA 11*a466cc55SCy Schubert# 12*a466cc55SCy Schubert# Redistribution and use is allowed according to the terms of the BSD license. 13*a466cc55SCy Schubert# For details see the accompanying COPYING-CMAKE-SCRIPTS file. 14*a466cc55SCy Schubert 15*a466cc55SCy Schubert#INCLUDE(CheckCSourceCompiles) 16*a466cc55SCy Schubert 17*a466cc55SCy SchubertGET_FILENAME_COMPONENT(_selfdir_CheckFileOffsetBits 18*a466cc55SCy Schubert "${CMAKE_CURRENT_LIST_FILE}" PATH) 19*a466cc55SCy Schubert 20*a466cc55SCy SchubertMACRO (CHECK_FILE_OFFSET_BITS) 21*a466cc55SCy Schubert IF(NOT DEFINED _FILE_OFFSET_BITS) 22*a466cc55SCy Schubert MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files") 23*a466cc55SCy Schubert TRY_COMPILE(__WITHOUT_FILE_OFFSET_BITS_64 24*a466cc55SCy Schubert ${CMAKE_CURRENT_BINARY_DIR} 25*a466cc55SCy Schubert ${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c 26*a466cc55SCy Schubert COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}) 27*a466cc55SCy Schubert IF(NOT __WITHOUT_FILE_OFFSET_BITS_64) 28*a466cc55SCy Schubert TRY_COMPILE(__WITH_FILE_OFFSET_BITS_64 29*a466cc55SCy Schubert ${CMAKE_CURRENT_BINARY_DIR} 30*a466cc55SCy Schubert ${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c 31*a466cc55SCy Schubert COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_FILE_OFFSET_BITS=64) 32*a466cc55SCy Schubert ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64) 33*a466cc55SCy Schubert 34*a466cc55SCy Schubert IF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) 35*a466cc55SCy Schubert SET(_FILE_OFFSET_BITS 64 CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files") 36*a466cc55SCy Schubert MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files - needed") 37*a466cc55SCy Schubert ELSE(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) 38*a466cc55SCy Schubert SET(_FILE_OFFSET_BITS "" CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files") 39*a466cc55SCy Schubert MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files - not needed") 40*a466cc55SCy Schubert ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) 41*a466cc55SCy Schubert ENDIF(NOT DEFINED _FILE_OFFSET_BITS) 42*a466cc55SCy Schubert 43*a466cc55SCy SchubertENDMACRO (CHECK_FILE_OFFSET_BITS) 44