1------------------------------------------------------------------ 2This file is part of bzip2/libbzip2, a program and library for 3lossless, block-sorting data compression. 4 5bzip2/libbzip2 version 1.0.8 of 13 July 2019 6Copyright (C) 1996-2019 Julian Seward <jseward@acm.org> 7 8Please read the WARNING, DISCLAIMER and PATENTS sections in the 9README file. 10 11This program is released under the terms of the license contained 12in the file LICENSE. 13------------------------------------------------------------------ 14 15bzip2 should compile without problems on the vast majority of 16platforms. Using the supplied Makefile, I've built and tested it 17myself for x86-linux and amd64-linux. With makefile.msc, Visual C++ 186.0 and nmake, you can build a native Win32 version too. Large file 19support seems to work correctly on at least on amd64-linux. 20 21When I say "large file" I mean a file of size 2,147,483,648 (2^31) 22bytes or above. Many older OSs can't handle files above this size, 23but many newer ones can. Large files are pretty huge -- most files 24you'll encounter are not Large Files. 25 26Early versions of bzip2 (0.1, 0.9.0, 0.9.5) compiled on a wide variety 27of platforms without difficulty, and I hope this version will continue 28in that tradition. However, in order to support large files, I've had 29to include the define -D_FILE_OFFSET_BITS=64 in the Makefile. This 30can cause problems. 31 32The technique of adding -D_FILE_OFFSET_BITS=64 to get large file 33support is, as far as I know, the Recommended Way to get correct large 34file support. For more details, see the Large File Support 35Specification, published by the Large File Summit, at 36 37 http://ftp.sas.com/standards/large.file 38 39As a general comment, if you get compilation errors which you think 40are related to large file support, try removing the above define from 41the Makefile, ie, delete the line 42 43 BIGFILES=-D_FILE_OFFSET_BITS=64 44 45from the Makefile, and do 'make clean ; make'. This will give you a 46version of bzip2 without large file support, which, for most 47applications, is probably not a problem. 48 49Alternatively, try some of the platform-specific hints listed below. 50 51You can use the spewG.c program to generate huge files to test bzip2's 52large file support, if you are feeling paranoid. Be aware though that 53any compilation problems which affect bzip2 will also affect spewG.c, 54alas. 55 56AIX: I have reports that for large file support, you need to specify 57-D_LARGE_FILES rather than -D_FILE_OFFSET_BITS=64. I have not tested 58this myself. 59