Package: libtool Version: 2.4.6-2 Severity: important Tags: upstream fixed-upstream Forwarded: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20006
Dear Maintainer, libtool 2.4.6-0.1 has introduced a performance regression which results in significant slowdown in compile time. Version 2.4.6-2 is still affected. Especially buildds of slower arches like mips* and arm* suffer a lot from this performance regression. Here are a few examples how mesa is affected by this bug: [2016-02-07] Accepted libtool 2.4.6-0.1 (source amd64 all) into unstable mipsel: https://buildd.debian.org/status/logs.php?pkg=mesa&arch=mipsel 11.1.1-2 (sid) Maybe-Successful 2016-01-15 19:04:32 mipsel-aql-02 50m 11.1.2-1 (sid) Maybe-Successful 2016-02-11 14:30:46 mipsel-aql-02 1h 22m armhf: https://buildd.debian.org/status/logs.php?pkg=mesa&arch=armhf 11.1.1-2 (sid) Maybe-Successful 2016-01-15 19:15:32 hoiby 34m 11.1.2-1 (sid) Maybe-Successful 2016-02-11 12:39:21 hoiby 52m i386: https://buildd.debian.org/status/logs.php?pkg=mesa&arch=i386 11.1.1-2 (sid) Maybe-Successful 2016-01-15 18:20:15 x86-grnet-01 7m 11.1.2-1 (sid) Maybe-Successful 2016-02-11 11:54:33 x86-grnet-01 10m x32: https://buildd.debian.org/status/logs.php?pkg=mesa&arch=x32 11.1.1-2 (sid) Maybe-Successful 2016-01-15 18:36:30 physik 17m 11.1.2-1 (sid) Maybe-Successful 2016-02-11 12:36:45 physik 28m or systemd on x32: https://buildd.debian.org/status/logs.php?pkg=systemd&arch=x32 228-6 (sid) Maybe-Successful 2016-02-04 12:42:54 physik 42m 229-1 (sid) Maybe-Successful 2016-02-11 23:35:48 physik 1h 3m This bug has been reported to upstream and has been fixed already [1]. There's also a blog post about this issue [2]. Unfortunately upstream hasn't released a new upstream release with those fixes yet. Please cherry-pick the following three patches from upstream master branch to mitigate the excessive sed forking: http://git.savannah.gnu.org/cgit/libtool.git/commit/?id=32f0df9835ac15ac17e04be57c368172c3ad1d19 http://git.savannah.gnu.org/cgit/libtool.git/commit/?id=16dbc070d32e6d4601cb5878dfdf69f2e29c84e1 http://git.savannah.gnu.org/cgit/libtool.git/commit/?id=9187e9a231e0a06cc29c336857e95f07f855b2c9 With those patches applied, libtool 2.4.6 still isn't as fast as 2.4.2 was, but it's much better than the unpatched version. Thanks, Andreas [1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20006 [2] https://harald.hoyer.xyz/2015/03/05/libtool-getting-rid-of-180000-sed-forks/
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