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114 lines
4.2 KiB
Plaintext
114 lines
4.2 KiB
Plaintext
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XZ Utils on DOS
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===============
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Introduction
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This document explains how to build XZ Utils for DOS using DJGPP.
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The resulting binaries should run at least on various DOS versions
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and under Windows 95/98/98SE/ME, which cannot run the Windows version
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of XZ Utils.
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This is currently experimental and has got very little testing.
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Getting and Installing DJGPP
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You may use <http://www.delorie.com/djgpp/zip-picker.html> to help
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deciding what to download, but as of writing (2009-02-13) that may
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not be the most convenient way taking into account what components
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are actually required to build XZ Utils. However, using the
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zip-picker can still be worth doing to get nice short summary of
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installation instructions (they can be found from readme.1st too).
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For more manual method, first select a mirror from
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<http://www.delorie.com/djgpp/getting.html>. You need
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the following files:
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unzip32.exe
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beta/v2/djdev204.zip
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v2gnu/bnu219b.zip
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v2gnu/gcc432b.zip
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v2gnu/mak3791b.zip
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v2gnu/sed415b.zip
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v2misc/csdpmi5b.zip
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If newer versions are available, probably you should try them first.
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Note that djdev203.zip is too old to build XZ Utils; you need at
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least djdev204.zip. Also note that you want csdpmi5b.zip even if you
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run under Windows or DOSEMU, because the XZ Utils Makefile will embed
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cwsdstub.exe to the resulting binaries.
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See the instructions in readme.1st found from djdev204.zip. Here's
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a short summary, but you should still read readme.1st.
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C:\> mkdir DJGPP
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C:\> cd DJGPP
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C:\DJGPP> c:\download\unzip32 c:\download\djdev204.zip
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C:\DJGPP> c:\download\unzip32 c:\download\bnu219b.zip
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C:\DJGPP> c:\download\unzip32 c:\download\gcc432b.zip
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C:\DJGPP> c:\download\unzip32 c:\download\mak3791b.zip
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C:\DJGPP> c:\download\unzip32 c:\download\sed415b.zip
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C:\DJGPP> c:\download\unzip32 c:\download\csdpmi5b.zip
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C:\DJGPP> set PATH=C:\DJGPP\BIN;%PATH%
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C:\DJGPP> set DJGPP=C:\DJGPP\DJGPP.ENV
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You may want to add the last two lines into AUTOEXEC.BAT or have,
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for example, DJGPP.BAT which you can run before using DJGPP.
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Make sure you use completely upper case path in the DJGPP environment
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variable. This is not required by DJGPP, but the XZ Utils Makefile is
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a bit stupid and expects that everything in DJGPP environment variable
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is uppercase.
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Building
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Just run "make" in this directory (the directory containing this
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README). You should get liblzma.a, xz.exe, xzdec.exe, and
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lzmadec.exe. Of these, probably xz.exe is the only interesting one.
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Note: You need to have an environment that supports long filenames.
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Once you have built XZ Utils, the resulting binaries can be run
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without long filename support.
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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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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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make DEBUG=1 CFLAGS="-g -O0"
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Bugs
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"make clean" may remove src/xz/hardware.c when it tries to remove
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src/xz/hardware-fixed.c. This is probably a bug somewhere in the
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DOS environment I use. Maybe it tries truncated 8.3 name first and
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since that gives a name of an existing file, it doesn't look for
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long filename.
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"xz -fc /dev/tty" hangs at least in DOSEMU and cannot be interrupted
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by pressing C-c. Maybe xz should never accept non-regular files on
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DOS even when --force is used.
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Using different memory usage limit for encoding and decoding doesn't
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make sense under pure DOS. Maybe it is still OK when running under
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Windows.
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The progress indicator of "xz -v" doesn't get updated when running
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under Dosbox, but it works in DOSEMU. I currently (2009-02-13) don't
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know if it works in other environments.
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Report bugs to <lasse.collin@tukaani.org> (in English or Finnish).
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