Commit graph

4 commits

Author SHA1 Message Date
John Ericson 43a98868ae common setup hooks: set -u robustness
Explicitly handle `dont*` and friends not being defined.
2019-11-01 14:44:43 -04:00
Piotr Bogdan 93545a8910 pruneLibtoolFiles: check if prefix exists 2018-12-09 22:44:29 +00:00
Piotr Bogdan 9cd155f1e2 pruneLibtoolFiles: more permissive regex for detecting libtool files 2018-12-09 00:13:04 +00:00
Orivej Desh fd97db43bc
pruneLibtoolFiles: init setup hook (#41819)
A .la file specifies linker flags to link with the library it describes. Its
"dependency_libs" field lists the libraries that this library depends upon.
This list often contains "-l" flags without corresponding "-L" flags. Many
packages in Nixpkgs deal with this in one of these ways:
- delete .la file [1]
- clear dependency_libs [2]
- add -L flags to dependency_libs [3]
- propagate dependencies [4]

Sometimes "dependency_libs" contain wrong "-L" flags pointing to the "dev"
output with headers rather than to the main output with libraries. They have to
be edited or deleted to reduce closure size [5].

Deleting .la files is often but not always safe [6].  Atomatically deleting as
many of them as possible is complex [7].  Deleting .la files that describe
shared rather than static libraries is probably safe; but clearing their
"dependency_libs" field achieves the same effect with less potential for
unintended consequences.  This is the approach that may be enabled for all
Nixpkgs.

[1] 2a79d296d3
[2] c83a530985
[3] 9e0dcf3bd9
[4] 01134e698f
[5] f6c73f1e37
[6] https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Handling_Libtool_Archives
[7] https://github.com/gentoo/gentoo/blob/fb1f2435/eclass/ltprune.eclass
2018-06-11 18:11:02 +00:00