2009-02-05 07:17:51 +00:00
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XZ Utils on Windows
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===================
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Introduction
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This document explains how to build XZ Utils for Microsoft Windows
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using MinGW (Minimalist GNU for Windows).
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This is currently experimental and has got very little testing.
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No ABI stability is promised for liblzma.dll.
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Why MinGW
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XZ Utils code is C99. It should be possible to compile at least
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liblzma using any C99 compiler. Compiling the command line tools may
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need a little extra work to get them built on new systems, because
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they use some features that aren't standardized in POSIX.
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MinGW is free software. MinGW runtime provides some functions that
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made porting the command line tools easier. Most(?) of the MinGW
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runtime, which gets linked into the resulting binaries, is in the
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public domain.
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While most C compilers nowadays support C99 well enough (including
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most compilers for Windows), MSVC doesn't. It seems that Microsoft
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has no plans to ever support C99. Thus, it is not possible to build
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XZ Utils using MSVC without doing a lot of work to convert the code.
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Using prebuilt liblzma from MSVC is possible though, since the
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liblzma API headers are in C89 and contain some non-standard extra
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hacks required by MSVC.
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Getting and Installing MinGW
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You can download MinGW for 32-bit Windows from Sourceforge:
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http://sourceforge.net/project/showfiles.php?group_id=2435
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It is enough to pick Automated MinGW Installer and MSYS Base System.
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Using the automated installer, select at least runtime, w32api,
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core compiler, and MinGW make. From MSYS you actually need only
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certain tools, but it is easiest to just install the whole MSYS.
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To build for x86-64 version of Windows, you can download a snapshot
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of MinGW targeting for 64-bit Windows:
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http://sourceforge.net/project/showfiles.php?group_id=202880
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You can use the 32-bit MSYS also for 64-bit build, since we don't
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link against anything in MSYS, just use the tools from it. You may
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use the make tool from 32-bit MinGW (mingw32-make.exe) although
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probably the make.exe from MSYS works too.
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Naturally you can pick the components manually, for example to try
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the latest available GCC. It is also possible to use a cross-compiler
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to build Windows binaries for example on GNU/Linux, or use Wine to
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run the Windows binaries. However, these instructions focus on
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building on Windows.
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Building for 32-bit Windows
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Add MinGW and MSYS to PATH (adjust if you installed to non-default
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location):
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2009-02-06 08:06:32 +00:00
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set PATH=C:\MinGW\bin;C:\MSYS\1.0\bin;%PATH%
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2009-02-05 07:17:51 +00:00
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2009-02-06 08:06:32 +00:00
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Then it should be enough to just run mingw32-make in this directory
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(the directory containing this README):
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2009-02-05 07:17:51 +00:00
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2009-02-06 08:06:32 +00:00
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mingw32-make
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2009-02-05 07:17:51 +00:00
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Building for 64-bit Windows
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For 64-bit build the PATH has to point to 64-bit MinGW:
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2009-02-06 08:06:32 +00:00
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set PATH=C:\MinGW64\bin;C:\MSYS\1.0\bin;%PATH%
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2009-02-05 07:17:51 +00:00
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You need to pass W64=1 to mingw32-make (or make if you don't have
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mingw32-make):
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2009-02-06 08:06:32 +00:00
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mingw32-make W64=1
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2009-02-05 07:17:51 +00:00
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Additional Make Flags and Targets
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You may want to try some additional optimizations, which may or
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may not make the code faster (and may or may not hit possible
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compiler bugs more easily):
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mingw32-make CFLAGS="-O3 -fomit-frame-pointer -funroll-loops"
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If you want to enable assertions (the assert() macro), use DEBUG=1.
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You may want to disable optimizations too if you plan to actually
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debug the code. Never use DEBUG=1 for production builds!
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mingw32-make DEBUG=1 CFLAGS="-g -O0"
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To copy the built binaries and required headers into a clean
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directory, use the pkg target:
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mingw32-make pkg
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It first removes a possibly existing pkg directory, and then
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recreates it with the required files.
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TODO: The pkg target doesn't copy any license or other copyright
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related information into the pkg directory.
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Creating an Import Library for MSVC
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The included Makefile creates import library liblzma.a which works
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only(?) with MinGW. To use liblzma.dll for MSVC, you need to create
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liblzma.lib using the lib command from MSVC:
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lib /def:liblzma.def /out:liblzma.lib /machine:ix86
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On x86-64, the /machine argument has to naturally be changed:
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lib /def:liblzma.def /out:liblzma.lib /machine:x64
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To Do
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- Test Win64 support and add instructions about getting x86-64
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version of MinGW.
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- Creating the import library for other compilers/linkers
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- Building with other compilers for Windows
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- liblzma currently uses cdecl. Would stdcall be more compatible?
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- Support building more size-optimized liblzma (the HAVE_SMALL
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define and other things that are needed)
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- Support selecting which parts of liblzma to build to make the
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library even smaller.
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- Use the configure script on Windows just like it is used on all
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the other systems?
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Bugs
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Report bugs to <lasse.collin@tukaani.org> (in English or Finnish).
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Take into account that I don't have MSVC and I cannot very easily
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test anything on Windows. As of writing, I have tried MinGW and the
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resulting binaries only under 32-bit Wine.
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