Trick the linker into not doing unncessary work searching for optimised
libraries that are not present, by symlinking the directories where
optimised libs would be to the main lib dir.
This reduces the ENOENT of git-annex init by about 1/2. The linker always
finds the files where it looks first time now. I have not looked at what
the wall clock speedup might be, it's probably rather small.
If a x86-64-v5 comes to be, the list will need to be extended. And there
may be other directories used on some machines that I have missed. Not done
for arm64 yet, or any uncommon architectures.
Sponsored-by: Dartmouth College's Datalad project
Previous change caused them to be skipped. Probably when @RPATH is
included in the path, it's a path to a file that actually exists.
Sponsored-by: Dartmouth College's Datalad project
This may or may not make the OSX build work on a newer version of OSX
than the one that's currently being used for release builds. I have not
been able to find good docs about how exactly to get back from such a
value to the actual path to the library that the linker would use.
nukeFile replaced with removeWhenExistsWith removeLink, which allows
using RawFilePath. Utility.Directory cannot use RawFilePath since setup
does not depend on posix.
This commit was sponsored by Graham Spencer on Patreon.
Had to split out some modules because getWorkingDirectory needs unix,
which is not a build-dep of configure.
This commit was sponsored by Brock Spratlen on Patreon.
hardlinks happened to work because it was a hard link to a symlink, but
it would have failed if eg git-annex-shell symlink did not exist,
perhaps because the Makefile was not run to build it. Or something like
that. Also, it seems like it worked by accident and the Makefile used to
ln -s.
This includes making Build.Standalone run LinuxMkLibs or OSXMkLibs
rather than doing that separately. Which is groundwork for a later
optimisation.
Also it simplified the code some.
Reduce the number of directories listed in libdirs, which makes the linker
check a lot less dead ends looking for directories.
Eliminated some directories that didn't really contain shared libraries,
or only contained the linker.
That left only 2, one in lib and one in usr/lib, so consolidate those two.
Doing it this way, rather than just consolidating all libs that might exist
into a single directory means that, if there are optimised versions of some
libs, eg in lib/subarch/foo.so, and lib/subarch2/foo.so, they don't get
moved around in a way that would make the linker pick the wrong one.
