1*b50261e2SCy Schubert# - Check if _FILE_OFFSET_BITS macro needed for large files 2*b50261e2SCy Schubert# CHECK_FILE_OFFSET_BITS () 3*b50261e2SCy Schubert# 4*b50261e2SCy Schubert# The following variables may be set before calling this macro to 5*b50261e2SCy Schubert# modify the way the check is run: 6*b50261e2SCy Schubert# 7*b50261e2SCy Schubert# CMAKE_REQUIRED_FLAGS = string of compile command line flags 8*b50261e2SCy Schubert# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) 9*b50261e2SCy Schubert# CMAKE_REQUIRED_INCLUDES = list of include directories 10*b50261e2SCy Schubert# Copyright (c) 2009, Michihiro NAKAJIMA 11*b50261e2SCy Schubert# 12*b50261e2SCy Schubert# Redistribution and use is allowed according to the terms of the BSD license. 13*b50261e2SCy Schubert# For details see the accompanying COPYING-CMAKE-SCRIPTS file. 14*b50261e2SCy Schubert 15*b50261e2SCy Schubert#INCLUDE(CheckCSourceCompiles) 16*b50261e2SCy Schubert 17*b50261e2SCy SchubertGET_FILENAME_COMPONENT(_selfdir_CheckFileOffsetBits 18*b50261e2SCy Schubert "${CMAKE_CURRENT_LIST_FILE}" PATH) 19*b50261e2SCy Schubert 20*b50261e2SCy SchubertMACRO (CHECK_FILE_OFFSET_BITS) 21*b50261e2SCy Schubert IF(NOT DEFINED _FILE_OFFSET_BITS) 22*b50261e2SCy Schubert MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files") 23*b50261e2SCy Schubert TRY_COMPILE(__WITHOUT_FILE_OFFSET_BITS_64 24*b50261e2SCy Schubert ${CMAKE_CURRENT_BINARY_DIR} 25*b50261e2SCy Schubert ${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c 26*b50261e2SCy Schubert COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}) 27*b50261e2SCy Schubert IF(NOT __WITHOUT_FILE_OFFSET_BITS_64) 28*b50261e2SCy Schubert TRY_COMPILE(__WITH_FILE_OFFSET_BITS_64 29*b50261e2SCy Schubert ${CMAKE_CURRENT_BINARY_DIR} 30*b50261e2SCy Schubert ${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c 31*b50261e2SCy Schubert COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_FILE_OFFSET_BITS=64) 32*b50261e2SCy Schubert ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64) 33*b50261e2SCy Schubert 34*b50261e2SCy Schubert IF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) 35*b50261e2SCy Schubert SET(_FILE_OFFSET_BITS 64 CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files") 36*b50261e2SCy Schubert MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files - needed") 37*b50261e2SCy Schubert ELSE(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) 38*b50261e2SCy Schubert SET(_FILE_OFFSET_BITS "" CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files") 39*b50261e2SCy Schubert MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files - not needed") 40*b50261e2SCy Schubert ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) 41*b50261e2SCy Schubert ENDIF(NOT DEFINED _FILE_OFFSET_BITS) 42*b50261e2SCy Schubert 43*b50261e2SCy SchubertENDMACRO (CHECK_FILE_OFFSET_BITS) 44