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kc3-lang/automake/lib
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Author :
Jim Meyering
Date : 2011-12-09 23:17:18
Hash : c8e01d58
Message : dist-xz, dist-bzip2: don't hard-code -9, honor envvar settings Before the present change, automake-generated `dist-xz' rule used a hard-coded `xz -9'. That was a problem because on this front, xz differs from gzip and bzip2. While the latter two don't incur any run-time decompression penalty for using a higher compression level, specifying -9 with xz imposes a potentially fatal virtual memory requirement on any client that wants to decompress your tar.xz file. People have complained that a tarball compressed with -9 cannot be uncompressed in a low-memory environment (wrt-based embedded). Hence, instead of defaulting to -9, which is useful only for very large tarballs, it defaults to -e (equivalent to -6e). This limits the default memory requirements imposed on decompressors, yet still gives very good compression ratios. * lib/am/distdir.am (dist-xz): Do not hard-code xz's -9: that made it impossible to override. Actually don't default to -9, either, since that induced inordinately large virtual memory usage when merely decompressing. Instead, use its XZ_OPT envvar, defaulting to -e if not defined. Suggested by Lasse Collin. (dist, dist-all) [?XZ?]: Likewise (dist-bzip2): Similarly, do not hard-code -9, but do continue to use -9 by default. Honor the BZIP2 envvar. (dist, dist-all) [?BZIP2?]: Likewise * NEWS: Update. * doc/automake.texi (The Types of Distributions): Describe the newly enabled environment variables. This is inspired to commit v1.11-389-g6da46f3, with additional changes to reflect that the xz compression level should default to -e, not -9.