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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18245 91177308-0d34-0410-b5e6-96231b3b80d8
131 lines
5.2 KiB
Plaintext
131 lines
5.2 KiB
Plaintext
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bzip2-1.0 should compile without problems on the vast majority of
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platforms. Using the supplied Makefile, I've built and tested it
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myself for x86-linux, sparc-solaris, alpha-linux, x86-cygwin32 and
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alpha-tru64unix. With makefile.msc, Visual C++ 6.0 and nmake, you can
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build a native Win32 version too. Large file support seems to work
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correctly on at least alpha-tru64unix and x86-cygwin32 (on Windows
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2000).
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When I say "large file" I mean a file of size 2,147,483,648 (2^31)
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bytes or above. Many older OSs can't handle files above this size,
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but many newer ones can. Large files are pretty huge -- most files
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you'll encounter are not Large Files.
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Earlier versions of bzip2 (0.1, 0.9.0, 0.9.5) compiled on a wide
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variety of platforms without difficulty, and I hope this version will
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continue in that tradition. However, in order to support large files,
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I've had to include the define -D_FILE_OFFSET_BITS=64 in the Makefile.
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This can cause problems.
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The technique of adding -D_FILE_OFFSET_BITS=64 to get large file
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support is, as far as I know, the Recommended Way to get correct large
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file support. For more details, see the Large File Support
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Specification, published by the Large File Summit, at
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http://www.sas.com/standard/large.file/
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As a general comment, if you get compilation errors which you think
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are related to large file support, try removing the above define from
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the Makefile, ie, delete the line
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BIGFILES=-D_FILE_OFFSET_BITS=64
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from the Makefile, and do 'make clean ; make'. This will give you a
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version of bzip2 without large file support, which, for most
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applications, is probably not a problem.
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Alternatively, try some of the platform-specific hints listed below.
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You can use the spewG.c program to generate huge files to test bzip2's
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large file support, if you are feeling paranoid. Be aware though that
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any compilation problems which affect bzip2 will also affect spewG.c,
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alas.
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Known problems as of 1.0pre8:
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* HP/UX 10.20 and 11.00, using gcc (2.7.2.3 and 2.95.2): A large
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number of warnings appear, including the following:
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/usr/include/sys/resource.h: In function `getrlimit':
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/usr/include/sys/resource.h:168:
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warning: implicit declaration of function `__getrlimit64'
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/usr/include/sys/resource.h: In function `setrlimit':
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/usr/include/sys/resource.h:170:
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warning: implicit declaration of function `__setrlimit64'
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This would appear to be a problem with large file support, header
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files and gcc. gcc may or may not give up at this point. If it
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fails, you might be able to improve matters by adding
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-D__STDC_EXT__=1
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to the BIGFILES variable in the Makefile (ie, change its definition
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to
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BIGFILES=-D_FILE_OFFSET_BITS=64 -D__STDC_EXT__=1
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Even if gcc does produce a binary which appears to work (ie passes
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its self-tests), you might want to test it to see if it works properly
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on large files.
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* HP/UX 10.20 and 11.00, using HP's cc compiler.
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No specific problems for this combination, except that you'll need to
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specify the -Ae flag, and zap the gcc-specific stuff
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-Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce.
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You should retain -D_FILE_OFFSET_BITS=64 in order to get large
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file support -- which is reported to work ok for this HP/UX + cc
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combination.
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* SunOS 4.1.X.
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Amazingly, there are still people out there using this venerable old
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banger. I shouldn't be too rude -- I started life on SunOS, and
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it was a pretty darn good OS, way back then. Anyway:
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SunOS doesn't seem to have strerror(), so you'll have to use
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perror(), perhaps by doing adding this (warning: UNTESTED CODE):
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char* strerror ( int errnum )
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{
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if (errnum < 0 || errnum >= sys_nerr)
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return "Unknown error";
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else
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return sys_errlist[errnum];
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}
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Or you could comment out the relevant calls to strerror; they're
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not mission-critical. Or you could upgrade to Solaris. Ha ha ha!
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(what?? you think I've got Bad Attitude?)
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* Making a shared library on Solaris. (Not really a compilation
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problem, but many people ask ...)
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Firstly, if you have Solaris 8, either you have libbz2.so already
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on your system, or you can install it from the Solaris CD.
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Secondly, be aware that there are potential naming conflicts
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between the .so file supplied with Solaris 8, and the .so file
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which Makefile-libbz2_so will make. Makefile-libbz2_so creates
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a .so which has the names which I intend to be "official" as
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of version 1.0.0 and onwards. Unfortunately, the .so in
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Solaris 8 appeared before I decided on the final names, so
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the two libraries are incompatible. We have since communicated
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and I hope that the problems will have been solved in the next
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version of Solaris, whenever that might appear.
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All that said: you might be able to get somewhere
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by finding the line in Makefile-libbz2_so which says
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$(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.2 $(OBJS)
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and replacing with
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$(CC) -G -shared -o libbz2.so.1.0.2 -h libbz2.so.1.0 $(OBJS)
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If gcc objects to the combination -fpic -fPIC, get rid of
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the second one, leaving just "-fpic".
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That's the end of the currently known compilation problems.
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