xz

TODO

Check if --enable-sandbox=landlock fails at run-time on kernels configured with CONFIG_SECURITY_LANDLOCK=n
Check if --enable-small causes major performance regressions or not
Check if SKIP_WERROR_CHECK=yes ./configure and ./configure --disable-werror are equivalent

alpine’s patch is still needed even after --disable-rpath
--enable-external-sha256 does not work with musl and is slower than the internal sha256 implementation (see INSTALL)
doxygen is disabled by default
lzma2 encoder requires that lzma1 support is also enabled
Leave the default decoders and checks set to all
Match finders are only used when encoding (bt2 and bt3 are effectively unused variants hidden from presets 0 through 9)
lzma1 and lzma2 encoders share the same set of match finders
xz can decompress .lz files starting from 5.4.0 so consider removing --disable-lzip-decoder if lzip support is really needed
microlzma is needed for erofs-utils
musl does not support symbol versions which are enabled by default on linux so explicitly pass --disable-symbol-versions
No need to pass --enable-assume-ram
--enable-path-for-scripts prepends PREFIX to PATH in scripts which we disable
--enable-unaligned-access is probably enabled by default

Shipping xzdec and lzmadec without size optimizations and statically-linked liblzma isn’t very useful (see PACKAGERS)

Both pxz and pixz depend on xz and do not provide liblzma and hence are not drop-in replacements for xz
COPYING.LICENSE files include the different licenses used by xz (they also switched their Public Domain files to 0BSD)
tarlz is faster than lzip in compression but is equal in decompression
The extra directory contains relatively “dangerous” scripts that can cause corruption
toybox plans to provide partial replacements for xz and utilities in its roadmap