f644473a21
It also works on E2K as it supports these intrinsics. On x86-64 runtime detection is used so the code keeps working on older processors too. A CLMUL-only build can be done by using -msse4.1 -mpclmul in CFLAGS and this will reduce the library size since the generic implementation and its 8 KiB lookup table will be omitted. On 32-bit x86 this isn't used by default for now because by default on 32-bit x86 the separate assembly file crc64_x86.S is used. If --disable-assembler is used then this new CLMUL code is used the same way as on 64-bit x86. However, a CLMUL-only build (-msse4.1 -mpclmul) won't omit the 8 KiB lookup table on 32-bit x86 due to a currently-missing check for disabled assembler usage. The configure.ac check should be such that the code won't be built if something in the toolchain doesn't support it but --disable-clmul-crc option can be used to unconditionally disable this feature. CLMUL speeds up decompression of files that have compressed very well (assuming CRC64 is used as a check type). It is know that the CLMUL code is significantly slower than the generic code for tiny inputs (especially 1-8 bytes but up to 16 bytes). If that is a real-world problem then there is already a commented-out variant that uses the generic version for small inputs. Thanks to Ilya Kurdyukov for the original patch which was derived from a white paper from Intel [1] (published in 2009) and public domain code from [2] (released in 2016). [1] https://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-generic-polynomials-pclmulqdq-paper.pdf [2] https://github.com/rawrunprotected/crc
719 lines
31 KiB
Plaintext
719 lines
31 KiB
Plaintext
|
|
XZ Utils Installation
|
|
=====================
|
|
|
|
0. Preface
|
|
1. Supported platforms
|
|
1.1. Compilers
|
|
1.2. Platform-specific notes
|
|
1.2.1. AIX
|
|
1.2.2. IRIX
|
|
1.2.3. MINIX 3
|
|
1.2.4. OpenVMS
|
|
1.2.5. Solaris, OpenSolaris, and derivatives
|
|
1.2.6. Tru64
|
|
1.2.7. Windows
|
|
1.2.8. DOS
|
|
1.2.9. z/OS
|
|
1.3. Adding support for new platforms
|
|
2. configure options
|
|
2.1. Static vs. dynamic linking of liblzma
|
|
2.2. Optimizing xzdec and lzmadec
|
|
3. xzgrep and other scripts
|
|
3.1. Dependencies
|
|
3.2. PATH
|
|
4. Troubleshooting
|
|
4.1. "No C99 compiler was found."
|
|
4.2. "No POSIX conforming shell (sh) was found."
|
|
4.3. configure works but build fails at crc32_x86.S
|
|
4.4. Lots of warnings about symbol visibility
|
|
4.5. "make check" fails
|
|
4.6. liblzma.so (or similar) not found when running xz
|
|
|
|
|
|
0. Preface
|
|
----------
|
|
|
|
If you aren't familiar with building packages that use GNU Autotools,
|
|
see the file INSTALL.generic for generic instructions before reading
|
|
further.
|
|
|
|
If you are going to build a package for distribution, see also the
|
|
file PACKAGERS. It contains information that should help making the
|
|
binary packages as good as possible, but the information isn't very
|
|
interesting to those making local builds for private use or for use
|
|
in special situations like embedded systems.
|
|
|
|
|
|
1. Supported platforms
|
|
----------------------
|
|
|
|
XZ Utils are developed on GNU/Linux, but they should work on many
|
|
POSIX-like operating systems like *BSDs and Solaris, and even on
|
|
a few non-POSIX operating systems.
|
|
|
|
|
|
1.1. Compilers
|
|
|
|
A C99 compiler is required to compile XZ Utils. If you use GCC, you
|
|
need at least version 3.x.x. GCC version 2.xx.x doesn't support some
|
|
C99 features used in XZ Utils source code, thus GCC 2 won't compile
|
|
XZ Utils.
|
|
|
|
XZ Utils takes advantage of some GNU C extensions when building
|
|
with GCC. Because these extensions are used only when building
|
|
with GCC, it should be possible to use any C99 compiler.
|
|
|
|
|
|
1.2. Platform-specific notes
|
|
|
|
1.2.1. AIX
|
|
|
|
If you use IBM XL C compiler, pass CC=xlc_r to configure. If
|
|
you use CC=xlc instead, you must disable threading support
|
|
with --disable-threads (usually not recommended).
|
|
|
|
|
|
1.2.2. IRIX
|
|
|
|
MIPSpro 7.4.4m has been reported to produce broken code if using
|
|
the -O2 optimization flag ("make check" fails). Using -O1 should
|
|
work.
|
|
|
|
A problem has been reported when using shared liblzma. Passing
|
|
--disable-shared to configure works around this. Alternatively,
|
|
putting "-64" to CFLAGS to build a 64-bit version might help too.
|
|
|
|
|
|
1.2.3. MINIX 3
|
|
|
|
The default install of MINIX 3 includes Amsterdam Compiler Kit (ACK),
|
|
which doesn't support C99. Install GCC to compile XZ Utils.
|
|
|
|
MINIX 3.1.8 and older have bugs in /usr/include/stdint.h, which has
|
|
to be patched before XZ Utils can be compiled correctly. See
|
|
<http://gforge.cs.vu.nl/gf/project/minix/tracker/?action=TrackerItemEdit&tracker_item_id=537>.
|
|
|
|
MINIX 3.2.0 and later use a different libc and aren't affected by
|
|
the above bug.
|
|
|
|
XZ Utils doesn't have code to detect the amount of physical RAM and
|
|
number of CPU cores on MINIX 3.
|
|
|
|
See section 4.4 in this file about symbol visibility warnings (you
|
|
may want to pass gl_cv_cc_visibility=no to configure).
|
|
|
|
|
|
1.2.4. OpenVMS
|
|
|
|
XZ Utils can be built for OpenVMS, but the build system files
|
|
are not included in the XZ Utils source package. The required
|
|
OpenVMS-specific files are maintained by Jouk Jansen and can be
|
|
downloaded here:
|
|
|
|
http://nchrem.tnw.tudelft.nl/openvms/software2.html#xzutils
|
|
|
|
|
|
1.2.5. Solaris, OpenSolaris, and derivatives
|
|
|
|
The following linker error has been reported on some x86 systems:
|
|
|
|
ld: fatal: relocation error: R_386_GOTOFF: ...
|
|
|
|
This can be worked around by passing gl_cv_cc_visibility=no
|
|
as an argument to the configure script.
|
|
|
|
test_scripts.sh in "make check" may fail if good enough tools are
|
|
missing from PATH (/usr/xpg4/bin or /usr/xpg6/bin). Nowadays
|
|
/usr/xpg4/bin is added to the script PATH by default on Solaris
|
|
(see --enable-path-for-scripts=PREFIX in section 2), but old xz
|
|
releases needed extra steps. See sections 4.5 and 3.2 for more
|
|
information.
|
|
|
|
|
|
1.2.6. Tru64
|
|
|
|
If you try to use the native C compiler on Tru64 (passing CC=cc to
|
|
configure), you may need the workaround mention in section 4.1 in
|
|
this file (pass also ac_cv_prog_cc_c99= to configure).
|
|
|
|
|
|
1.2.7. Windows
|
|
|
|
If it is enough to build liblzma (no command line tools):
|
|
|
|
- There is experimental CMake support. As it is, it should be
|
|
good enough to build static liblzma with Visual Studio.
|
|
Building liblzma.dll might work too (if it doesn't, it should
|
|
be fixed). The CMake support may work with MinGW or MinGW-w64.
|
|
Read the comment in the beginning of CMakeLists.txt before
|
|
running CMake!
|
|
|
|
- There are Visual Studio project files under the "windows"
|
|
directory. See windows/INSTALL-MSVC.txt. In the future the
|
|
project files will be removed when CMake support is good
|
|
enough. Thus, please test the CMake version and help fix
|
|
possible issues.
|
|
|
|
To build also the command line tools:
|
|
|
|
- MinGW-w64 + MSYS (32-bit and 64-bit x86): This is used
|
|
for building the official binary packages for Windows.
|
|
There is windows/build.bash to ease packaging XZ Utils with
|
|
MinGW(-w64) + MSYS into a redistributable .zip or .7z file.
|
|
See windows/INSTALL-MinGW.txt for more information.
|
|
|
|
- MinGW + MSYS (32-bit x86): I haven't recently tested this.
|
|
|
|
- Cygwin 1.7.35 and later: NOTE that using XZ Utils >= 5.2.0
|
|
under Cygwin older than 1.7.35 can lead to DATA LOSS! If
|
|
you must use an old Cygwin version, stick to XZ Utils 5.0.x
|
|
which is safe under older Cygwin versions. You can check
|
|
the Cygwin version with the command "cygcheck -V".
|
|
|
|
It may be possible to build liblzma with other toolchains too, but
|
|
that will probably require writing a separate makefile. Building
|
|
the command line tools with non-GNU toolchains will be harder than
|
|
building only liblzma.
|
|
|
|
Even if liblzma is built with MinGW(-w64), the resulting DLL can
|
|
be used by other compilers and linkers, including MSVC. See
|
|
windows/README-Windows.txt for details.
|
|
|
|
|
|
1.2.8. DOS
|
|
|
|
There is a Makefile in the "dos" directory to build XZ Utils on
|
|
DOS using DJGPP. Support for long file names (LFN) is needed at
|
|
build time but the resulting xz.exe works without LFN support too.
|
|
See dos/INSTALL.txt and dos/README.txt for more information.
|
|
|
|
|
|
1.2.9. z/OS
|
|
|
|
To build XZ Utils on z/OS UNIX System Services using xlc, pass
|
|
these options to the configure script: CC='xlc -qhaltonmsg=CCN3296'
|
|
CPPFLAS='-D_UNIX03_THREADS -D_XOPEN_SOURCE=600'. The first makes
|
|
xlc throw an error if a header file is missing, which is required
|
|
to make the tests in configure work. The CPPFLAGS are needed to
|
|
get pthread support (some other CPPFLAGS may work too; if there
|
|
are problems, try -D_UNIX95_THREADS instead of -D_UNIX03_THREADS).
|
|
|
|
test_scripts.sh in "make check" will fail even if the scripts
|
|
actually work because the test data includes compressed files
|
|
with US-ASCII text.
|
|
|
|
No other tests should fail. If test_files.sh fails, check that
|
|
the included .xz test files weren't affected by EBCDIC conversion.
|
|
|
|
XZ Utils doesn't have code to detect the amount of physical RAM and
|
|
number of CPU cores on z/OS.
|
|
|
|
|
|
1.3. Adding support for new platforms
|
|
|
|
If you have written patches to make XZ Utils to work on previously
|
|
unsupported platform, please send the patches to me! I will consider
|
|
including them to the official version. It's nice to minimize the
|
|
need of third-party patching.
|
|
|
|
One exception: Don't request or send patches to change the whole
|
|
source package to C89. I find C99 substantially nicer to write and
|
|
maintain. However, the public library headers must be in C89 to
|
|
avoid frustrating those who maintain programs, which are strictly
|
|
in C89 or C++.
|
|
|
|
|
|
2. configure options
|
|
--------------------
|
|
|
|
In most cases, the defaults are what you want. Many of the options
|
|
below are useful only when building a size-optimized version of
|
|
liblzma or command line tools.
|
|
|
|
--enable-encoders=LIST
|
|
--disable-encoders
|
|
Specify a comma-separated LIST of filter encoders to
|
|
build. See "./configure --help" for exact list of
|
|
available filter encoders. The default is to build all
|
|
supported encoders.
|
|
|
|
If LIST is empty or --disable-encoders is used, no filter
|
|
encoders will be built and also the code shared between
|
|
encoders will be omitted.
|
|
|
|
Disabling encoders will remove some symbols from the
|
|
liblzma ABI, so this option should be used only when it
|
|
is known to not cause problems.
|
|
|
|
--enable-decoders=LIST
|
|
--disable-decoders
|
|
This is like --enable-encoders but for decoders. The
|
|
default is to build all supported decoders.
|
|
|
|
--enable-match-finders=LIST
|
|
liblzma includes two categories of match finders:
|
|
hash chains and binary trees. Hash chains (hc3 and hc4)
|
|
are quite fast but they don't provide the best compression
|
|
ratio. Binary trees (bt2, bt3 and bt4) give excellent
|
|
compression ratio, but they are slower and need more
|
|
memory than hash chains.
|
|
|
|
You need to enable at least one match finder to build the
|
|
LZMA1 or LZMA2 filter encoders. Usually hash chains are
|
|
used only in the fast mode, while binary trees are used to
|
|
when the best compression ratio is wanted.
|
|
|
|
The default is to build all the match finders if LZMA1
|
|
or LZMA2 filter encoders are being built.
|
|
|
|
--enable-checks=LIST
|
|
liblzma support multiple integrity checks. CRC32 is
|
|
mandatory, and cannot be omitted. See "./configure --help"
|
|
for exact list of available integrity check types.
|
|
|
|
liblzma and the command line tools can decompress files
|
|
which use unsupported integrity check type, but naturally
|
|
the file integrity cannot be verified in that case.
|
|
|
|
Disabling integrity checks may remove some symbols from
|
|
the liblzma ABI, so this option should be used only when
|
|
it is known to not cause problems.
|
|
|
|
--enable-external-sha256
|
|
Try to use SHA-256 code from the operating system libc
|
|
or similar base system libraries. This doesn't try to
|
|
use OpenSSL or libgcrypt or such libraries.
|
|
|
|
The reasons to use this option:
|
|
|
|
- It makes liblzma slightly smaller.
|
|
|
|
- It might improve SHA-256 speed if the implementation
|
|
in the operating is very good (but see below).
|
|
|
|
External SHA-256 is disabled by default for two reasons:
|
|
|
|
- On some operating systems the symbol names of the
|
|
SHA-256 functions conflict with OpenSSL's libcrypto.
|
|
This causes weird problems such as decompression
|
|
errors if an application is linked against both
|
|
liblzma and libcrypto. This problem affects at least
|
|
FreeBSD 10 and older and MINIX 3.3.0 and older, but
|
|
other OSes that provide a function "SHA256_Init" might
|
|
also be affected. FreeBSD 11 has the problem fixed.
|
|
NetBSD had the problem but it was fixed it in 2009
|
|
already. OpenBSD uses "SHA256Init" and thus never had
|
|
a conflict with libcrypto.
|
|
|
|
- The SHA-256 code in liblzma is faster than the SHA-256
|
|
code provided by some operating systems. If you are
|
|
curious, build two copies of xz (internal and external
|
|
SHA-256) and compare the decompression (xz --test)
|
|
times:
|
|
|
|
dd if=/dev/zero bs=1024k count=1024 \
|
|
| xz -v -0 -Csha256 > foo.xz
|
|
time xz --test foo.xz
|
|
|
|
--disable-microlzma
|
|
Don't build MicroLZMA encoder and decoder. This omits
|
|
lzma_microlzma_encoder() and lzma_microlzma_decoder()
|
|
API functions from liblzma. These functions are needed
|
|
by specific applications only. They were written for
|
|
erofs-utils but they may be used by others too.
|
|
|
|
--disable-lzip-decoder
|
|
Disable decompression support for .lz (lzip) files.
|
|
This omits the API function lzma_lzip_decoder() from
|
|
liblzma and .lz support from the xz tool.
|
|
|
|
--disable-xz
|
|
--disable-xzdec
|
|
--disable-lzmadec
|
|
--disable-lzmainfo
|
|
Don't build and install the command line tool mentioned
|
|
in the option name.
|
|
|
|
NOTE: Disabling xz will skip some tests in "make check".
|
|
|
|
NOTE: If xzdec is disabled and lzmadec is left enabled,
|
|
a dangling man page symlink lzmadec.1 -> xzdec.1 is
|
|
created.
|
|
|
|
--disable-lzma-links
|
|
Don't create symlinks for LZMA Utils compatibility.
|
|
This includes lzma, unlzma, and lzcat. If scripts are
|
|
installed, also lzdiff, lzcmp, lzgrep, lzegrep, lzfgrep,
|
|
lzmore, and lzless will be omitted if this option is used.
|
|
|
|
--disable-scripts
|
|
Don't install the scripts xzdiff, xzgrep, xzmore, xzless,
|
|
and their symlinks.
|
|
|
|
--disable-doc
|
|
Don't install the documentation files to $docdir
|
|
(often /usr/doc/xz or /usr/local/doc/xz). Man pages
|
|
will still be installed. The $docdir can be changed
|
|
with --docdir=DIR.
|
|
|
|
--disable-assembler
|
|
liblzma includes some assembler optimizations. Currently
|
|
there is only assembler code for CRC32 and CRC64 for
|
|
32-bit x86.
|
|
|
|
All the assembler code in liblzma is position-independent
|
|
code, which is suitable for use in shared libraries and
|
|
position-independent executables. So far only i386
|
|
instructions are used, but the code is optimized for i686
|
|
class CPUs. If you are compiling liblzma exclusively for
|
|
pre-i686 systems, you may want to disable the assembler
|
|
code.
|
|
|
|
--disable-clmul-crc
|
|
Disable the use carryless multiplication for CRC
|
|
calculation even if compiler support for it is detected.
|
|
The code uses runtime detection of SSSE3, SSE4.1, and
|
|
CLMUL instructions on x86. On 32-bit x86 this currently
|
|
is used only if --disable-assembler is used (this might
|
|
be fixed in the future). The code works on E2K too.
|
|
|
|
If using compiler options that unconditionally allow the
|
|
required extensions (-msse4.1 -mpclmul) then runtime
|
|
detection isn't used and the generic code is omitted.
|
|
|
|
--enable-unaligned-access
|
|
Allow liblzma to use unaligned memory access for 16-bit,
|
|
32-bit, and 64-bit loads and stores. This should be
|
|
enabled only when the hardware supports this, that is,
|
|
when unaligned access is fast. Some operating system
|
|
kernels emulate unaligned access, which is extremely
|
|
slow. This option shouldn't be used on systems that
|
|
rely on such emulation.
|
|
|
|
Unaligned access is enabled by default on x86, x86-64,
|
|
big endian PowerPC, some ARM, and some ARM64 systems.
|
|
|
|
--enable-unsafe-type-punning
|
|
This enables use of code like
|
|
|
|
uint8_t *buf8 = ...;
|
|
*(uint32_t *)buf8 = ...;
|
|
|
|
which violates strict aliasing rules and may result
|
|
in broken code. There should be no need to use this
|
|
option with recent GCC or Clang versions on any
|
|
arch as just as fast code can be generated in a safe
|
|
way too (using __builtin_assume_aligned + memcpy).
|
|
|
|
However, this option might improve performance in some
|
|
other cases, especially with old compilers (for example,
|
|
GCC 3 and early 4.x on x86, GCC < 6 on ARMv6 and ARMv7).
|
|
|
|
--enable-small
|
|
Reduce the size of liblzma by selecting smaller but
|
|
semantically equivalent version of some functions, and
|
|
omit precomputed lookup tables. This option tends to
|
|
make liblzma slightly slower.
|
|
|
|
Note that while omitting the precomputed tables makes
|
|
liblzma smaller on disk, the tables are still needed at
|
|
run time, and need to be computed at startup. This also
|
|
means that the RAM holding the tables won't be shared
|
|
between applications linked against shared liblzma.
|
|
|
|
This option doesn't modify CFLAGS to tell the compiler
|
|
to optimize for size. You need to add -Os or equivalent
|
|
flag(s) to CFLAGS manually.
|
|
|
|
--enable-assume-ram=SIZE
|
|
On the most common operating systems, XZ Utils is able to
|
|
detect the amount of physical memory on the system. This
|
|
information is used by the options --memlimit-compress,
|
|
--memlimit-decompress, and --memlimit when setting the
|
|
limit to a percentage of total RAM.
|
|
|
|
On some systems, there is no code to detect the amount of
|
|
RAM though. Using --enable-assume-ram one can set how much
|
|
memory to assume on these systems. SIZE is given as MiB.
|
|
The default is 128 MiB.
|
|
|
|
Feel free to send patches to add support for detecting
|
|
the amount of RAM on the operating system you use. See
|
|
src/common/tuklib_physmem.c for details.
|
|
|
|
--enable-threads=METHOD
|
|
Threading support is enabled by default so normally there
|
|
is no need to specify this option.
|
|
|
|
Supported values for METHOD:
|
|
|
|
yes Autodetect the threading method. If none
|
|
is found, configure will give an error.
|
|
|
|
posix Use POSIX pthreads. This is the default
|
|
except on Windows outside Cygwin.
|
|
|
|
win95 Use Windows 95 compatible threads. This
|
|
is compatible with Windows XP and later
|
|
too. This is the default for 32-bit x86
|
|
Windows builds. The `win95' threading is
|
|
incompatible with --enable-small.
|
|
|
|
vista Use Windows Vista compatible threads. The
|
|
resulting binaries won't run on Windows XP
|
|
or older. This is the default for Windows
|
|
excluding 32-bit x86 builds (that is, on
|
|
x86-64 the default is `vista').
|
|
|
|
no Disable threading support. This is the
|
|
same as using --disable-threads.
|
|
NOTE: If combined with --enable-small
|
|
and the compiler doesn't support
|
|
__attribute__((__constructor__)), the
|
|
resulting liblzma won't be thread safe,
|
|
that is, if a multi-threaded application
|
|
calls any liblzma functions from more than
|
|
one thread, something bad may happen.
|
|
|
|
--enable-sandbox=METHOD
|
|
There is limited sandboxing support in the xz tool. If
|
|
built with sandbox support, it's used automatically when
|
|
(de)compressing exactly one file to standard output and
|
|
the options --files or --files0 weren't used. This is a
|
|
common use case, for example, (de)compressing .tar.xz
|
|
files via GNU tar. The sandbox is also used for
|
|
single-file `xz --test' or `xz --list'.
|
|
|
|
Supported METHODs:
|
|
|
|
auto Look for a supported sandboxing method
|
|
and use it if found. If no method is
|
|
found, then sandboxing isn't used.
|
|
This is the default.
|
|
|
|
no Disable sandboxing support.
|
|
|
|
capsicum
|
|
Use Capsicum (FreeBSD >= 10) for
|
|
sandboxing. If no Capsicum support
|
|
is found, configure will give an error.
|
|
|
|
pledge Use pledge(2) (OpenBSD >= 5.9) for
|
|
sandboxing. If pledge(2) isn't found,
|
|
configure will give an error.
|
|
|
|
--enable-symbol-versions
|
|
Use symbol versioning for liblzma. This is enabled by
|
|
default on GNU/Linux, other GNU-based systems, and
|
|
FreeBSD.
|
|
|
|
--enable-debug
|
|
This enables the assert() macro and possibly some other
|
|
run-time consistency checks. It makes the code slower, so
|
|
you normally don't want to have this enabled.
|
|
|
|
--enable-werror
|
|
If building with GCC, make all compiler warnings an error,
|
|
that abort the compilation. This may help catching bugs,
|
|
and should work on most systems. This has no effect on the
|
|
resulting binaries.
|
|
|
|
--enable-path-for-scripts=PREFIX
|
|
If PREFIX isn't empty, PATH=PREFIX:$PATH will be set in
|
|
the beginning of the scripts (xzgrep and others).
|
|
The default is empty except on Solaris the default is
|
|
/usr/xpg4/bin.
|
|
|
|
This can be useful if the default PATH doesn't contain
|
|
modern POSIX tools (as can be the case on Solaris) or if
|
|
one wants to ensure that the correct xz binary is in the
|
|
PATH for the scripts. Note that the latter use can break
|
|
"make check" if the prefixed PATH causes a wrong xz binary
|
|
(other than the one that was just built) to be used.
|
|
|
|
Older xz releases support a different method for setting
|
|
the PATH for the scripts. It is described in section 3.2
|
|
and is supported in this xz version too.
|
|
|
|
|
|
2.1. Static vs. dynamic linking of liblzma
|
|
|
|
On 32-bit x86, linking against static liblzma can give a minor
|
|
speed improvement. Static libraries on x86 are usually compiled as
|
|
position-dependent code (non-PIC) and shared libraries are built as
|
|
position-independent code (PIC). PIC wastes one register, which can
|
|
make the code slightly slower compared to a non-PIC version. (Note
|
|
that this doesn't apply to x86-64.)
|
|
|
|
If you want to link xz against static liblzma, the simplest way
|
|
is to pass --disable-shared to configure. If you want also shared
|
|
liblzma, run configure again and run "make install" only for
|
|
src/liblzma.
|
|
|
|
|
|
2.2. Optimizing xzdec and lzmadec
|
|
|
|
xzdec and lzmadec are intended to be relatively small instead of
|
|
optimizing for the best speed. Thus, it is a good idea to build
|
|
xzdec and lzmadec separately:
|
|
|
|
- To link the tools against static liblzma, pass --disable-shared
|
|
to configure.
|
|
|
|
- To select somewhat size-optimized variant of some things in
|
|
liblzma, pass --enable-small to configure.
|
|
|
|
- Tell the compiler to optimize for size instead of speed.
|
|
For example, with GCC, put -Os into CFLAGS.
|
|
|
|
- xzdec and lzmadec will never use multithreading capabilities of
|
|
liblzma. You can avoid dependency on libpthread by passing
|
|
--disable-threads to configure.
|
|
|
|
- There are and will be no translated messages for xzdec and
|
|
lzmadec, so it is fine to pass also --disable-nls to configure.
|
|
|
|
- Only decoder code is needed, so you can speed up the build
|
|
slightly by passing --disable-encoders to configure. This
|
|
shouldn't affect the final size of the executables though,
|
|
because the linker is able to omit the encoder code anyway.
|
|
|
|
If you have no use for xzdec or lzmadec, you can disable them with
|
|
--disable-xzdec and --disable-lzmadec.
|
|
|
|
|
|
3. xzgrep and other scripts
|
|
---------------------------
|
|
|
|
3.1. Dependencies
|
|
|
|
POSIX shell (sh) and bunch of other standard POSIX tools are required
|
|
to run the scripts. The configure script tries to find a POSIX
|
|
compliant sh, but if it fails, you can force the shell by passing
|
|
gl_cv_posix_shell=/path/to/posix-sh as an argument to the configure
|
|
script.
|
|
|
|
xzdiff (xzcmp/lzdiff/lzcmp) may use mktemp if it is available. As
|
|
a fallback xzdiff will use mkdir to securely create a temporary
|
|
directory. Having mktemp available is still recommended since the
|
|
mkdir fallback method isn't as robust as mktemp is. The original
|
|
mktemp can be found from <http://www.mktemp.org/>. On GNU, most will
|
|
use the mktemp program from GNU coreutils instead of the original
|
|
implementation. Both mktemp versions are fine.
|
|
|
|
In addition to using xz to decompress .xz files, xzgrep and xzdiff
|
|
use gzip, bzip2, and lzop to support .gz, bz2, and .lzo files.
|
|
|
|
|
|
3.2. PATH
|
|
|
|
The method described below is supported by older xz releases.
|
|
It is supported by the current version too, but the newer
|
|
--enable-path-for-scripts=PREFIX described in section 2 may be
|
|
more convenient.
|
|
|
|
The scripts assume that the required tools (standard POSIX utilities,
|
|
mktemp, and xz) are in PATH; the scripts don't set the PATH themselves
|
|
(except as described for --enable-path-for-scripts=PREFIX). Some
|
|
people like this while some think this is a bug. Those in the latter
|
|
group can easily patch the scripts before running the configure script
|
|
by taking advantage of a placeholder line in the scripts.
|
|
|
|
For example, to make the scripts prefix /usr/bin:/bin to PATH:
|
|
|
|
perl -pi -e 's|^#SET_PATH.*$|PATH=/usr/bin:/bin:\$PATH|' \
|
|
src/scripts/xz*.in
|
|
|
|
|
|
4. Troubleshooting
|
|
------------------
|
|
|
|
4.1. "No C99 compiler was found."
|
|
|
|
You need a C99 compiler to build XZ Utils. If the configure script
|
|
cannot find a C99 compiler and you think you have such a compiler
|
|
installed, set the compiler command by passing CC=/path/to/c99 as
|
|
an argument to the configure script.
|
|
|
|
If you get this error even when you think your compiler supports C99,
|
|
you can override the test by passing ac_cv_prog_cc_c99= as an argument
|
|
to the configure script. The test for C99 compiler is not perfect (and
|
|
it is not as easy to make it perfect as it sounds), so sometimes this
|
|
may be needed. You will get a compile error if your compiler doesn't
|
|
support enough C99.
|
|
|
|
|
|
4.2. "No POSIX conforming shell (sh) was found."
|
|
|
|
xzgrep and other scripts need a shell that (roughly) conforms
|
|
to POSIX. The configure script tries to find such a shell. If
|
|
it fails, you can force the shell to be used by passing
|
|
gl_cv_posix_shell=/path/to/posix-sh as an argument to the configure
|
|
script. Alternatively you can omit the installation of scripts and
|
|
this error by passing --disable-scripts to configure.
|
|
|
|
|
|
4.3. configure works but build fails at crc32_x86.S
|
|
|
|
The easy fix is to pass --disable-assembler to the configure script.
|
|
|
|
The configure script determines if assembler code can be used by
|
|
looking at the configure triplet; there is currently no check if
|
|
the assembler code can actually actually be built. The x86 assembler
|
|
code should work on x86 GNU/Linux, *BSDs, Solaris, Darwin, MinGW,
|
|
Cygwin, and DJGPP. On other x86 systems, there may be problems and
|
|
the assembler code may need to be disabled with the configure option.
|
|
|
|
If you get this error when building for x86-64, you have specified or
|
|
the configure script has misguessed your architecture. Pass the
|
|
correct configure triplet using the --build=CPU-COMPANY-SYSTEM option
|
|
(see INSTALL.generic).
|
|
|
|
|
|
4.4. Lots of warnings about symbol visibility
|
|
|
|
On some systems where symbol visibility isn't supported, GCC may
|
|
still accept the visibility options and attributes, which will make
|
|
configure think that visibility is supported. This will result in
|
|
many compiler warnings. You can avoid the warnings by forcing the
|
|
visibility support off by passing gl_cv_cc_visibility=no as an
|
|
argument to the configure script. This has no effect on the
|
|
resulting binaries, but fewer warnings looks nicer and may allow
|
|
using --enable-werror.
|
|
|
|
|
|
4.5. "make check" fails
|
|
|
|
If the other tests pass but test_scripts.sh fails, then the problem
|
|
is in the scripts in src/scripts. Comparing the contents of
|
|
tests/xzgrep_test_output to tests/xzgrep_expected_output might
|
|
give a good idea about problems in xzgrep. One possibility is that
|
|
some tools are missing from the current PATH or the tools lack
|
|
support for some POSIX features. This can happen at least on
|
|
Solaris where the tools in /bin may be ancient but good enough
|
|
tools are available in /usr/xpg4/bin or /usr/xpg6/bin. For possible
|
|
fixes, see --enable-path-for-scripts=PREFIX in section 2 and the
|
|
older alternative method described in section 3.2 of this file.
|
|
|
|
If tests other than test_scripts.sh fail, a likely reason is that
|
|
libtool links the test programs against an installed version of
|
|
liblzma instead of the version that was just built. This is
|
|
obviously a bug which seems to happen on some platforms.
|
|
A workaround is to uninstall the old liblzma versions first.
|
|
|
|
If the problem isn't any of those described above, then it's likely
|
|
a bug in XZ Utils or in the compiler. See the platform-specific
|
|
notes in this file for possible known problems. Please report
|
|
a bug if you cannot solve the problem. See README for contact
|
|
information.
|
|
|
|
|
|
4.6. liblzma.so (or similar) not found when running xz
|
|
|
|
If you installed the package with "make install" and get an error
|
|
about liblzma.so (or a similarly named file) being missing, try
|
|
running "ldconfig" to update the run-time linker cache (if your
|
|
operating system has such a command).
|
|
|