On Thu, 14 Oct 2010, Erik Cederstrand wrote:
Den 13/10/2010 kl. 05.55 skrev Bruce Evans:
[Erik wrote, but the attribution was stripped]
I'm a real beginner here. As I read the manuals (GNU ar and BSD ar),
the only flags that really control archive contents on archive
creation is 'q' and 'r'. The 'l' is ignored, 'c' and 'v' control
verbosity, and 'u' and 's' are for performance purposes that are
largely irrelevant today (extracting every single *.a file and
recreating it wit ar -rD takes less than 10 secs on my slow machine).
Is there any negative impact at runtime from having all archives
created with either -rD or -qD (ignoring verbosity at build time for
now)?
I don't really know. 's' is also useful for non-libraries. 'u' is related
to clobbering times, but goes the wrong way by updating the archive if the
file is newer. I think all FreeBSD libraries should be built with the same
flags (probably ARFLAGS, with you putting -D in it if you don't want the
timestamp update). However, the places that already use ARFLAGS but set it
themselves may be a problem. Some Makefiles initentionally avoid using
bsd.lib.mk because they are special and it does the wrong things for them.
They probably don't really care about the exact archive flags, but need to
be checked individually.
I'd like to give it a try. This is where an easy-to-use regression suite
with reasonable coverage for FreeBSD would come in handy :-)
I am certainly willing to help test, and maybe even help check the uses of
ARFLAGS (though I seem to have a severe shortage of time).
I still have my test environment where ar(1) bails without -D, which would
probably be helpful.
-Ben
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