mirror of
https://github.com/Ponce/slackbuilds
synced 2024-12-02 13:04:42 +01:00
56 lines
3 KiB
Text
56 lines
3 KiB
Text
|
|
Here is a hopefully informative mini-rant about shared library support
|
|
for mupdf.
|
|
|
|
Upstream doesn't do shared libraries and doesn't recommend distro
|
|
packages use them. This build used to follow that advice. However,
|
|
mupdf is just too large to use as a static library. We end up with a
|
|
47MB libmupdf.a, plus 7 33MB binaries. *Every* distro I've looked at
|
|
ships mupdf as shared libs, despite upstream's policy.
|
|
|
|
A long time ago (in 2013), I used to patch mupdf for shared lib support,
|
|
but I removed it when it stopped applying cleanly. Thomas Morper on the
|
|
slackbuilds-users mailing list recently (2018) asked if I could include
|
|
a patch (from LFS) that adds shared library support, so starting with
|
|
mupdf 1.13.0, BUILD 2, we have shared libraries again.
|
|
|
|
In case someone *really* disagrees with this change, I added a STATIC=yes
|
|
environment setting. If you use this, you get static libs and no
|
|
shared ones, per upstream's policy. This has been tested and works for
|
|
1.13.0-2, but be aware that I probably won't be testing static builds
|
|
for every mupdf release. If you run into trouble, email me and/or the
|
|
slackbuilds-users list.
|
|
|
|
The library versioning scheme I had to use is unfortunate. The major
|
|
soname version is supposed to only change when there's an incompatible ABI
|
|
change. The way I'm doing it, it changes for every mupdf release [*]. This
|
|
is because upstream doesn't tell us when the ABI changes, because it's
|
|
not relevant for them. They support only static libs specifically to
|
|
avoid the headache of having to track and minimize ABI changes. Whenever
|
|
they want to change the ABI, they just do it. Anything built against the
|
|
old version will keep working fine, because it's statically linked. With
|
|
shared libs, I have to invent my own library versioning scheme.
|
|
|
|
The end result of this is, I (humble packager) can't easily tell when
|
|
the ABI has changed, so I treat every release [*] as an ABI change. Means
|
|
anything linked with libmupdf will fail with 'cannot open shared object
|
|
file' after a mupdf upgrade, so it'll have to be rebuilt. The alternative
|
|
would be to use unversioned shared libs, which would (seem to) avoid
|
|
the need to rebuild... but whenever the undocumented ABI changed, we'd
|
|
get weird behaviour and segfaults instead of a clean error message.
|
|
|
|
The shared library patch used here is by me (B. Watson), based on a
|
|
patch from Linux From Scratch. The original LFS patch doesn't include
|
|
versioned libs, I suspect becase in LFS you tend to upgrade the entire
|
|
OS by rebuilding it, instead of upgrading just one library.
|
|
|
|
Right now, the only SBo builds affected by mupdf upgrades will be
|
|
zathura-pdf-mupdf and possibly fbpdf (if built with optional mupdf
|
|
support). Both have been tested with shared mupdf, and both compile and
|
|
run cleanly.
|
|
|
|
[*] Actually, not micro-version point releases (e.g. 1.13.0 => 1.13.1).
|
|
Hopefully this doesn't cause a problem later. Upstream has just
|
|
switched to a major.minor.micro version scheme starting with 1.13.0,
|
|
so I don't know how often there will be micro-version bumps, and
|
|
whether or not they'll have ABI changes.
|