On 21 Aug 2010, at 18:06, Kostik Belousov wrote: > On Sat, Aug 21, 2010 at 03:33:35PM +0100, Rui Paulo wrote: >> >> On 21 Aug 2010, at 15:23, Kostik Belousov wrote: >> >>> On Sat, Aug 21, 2010 at 03:16:49PM +0100, Rui Paulo wrote: >>>> >>>> On 21 Aug 2010, at 14:59, Kostik Belousov wrote: >>>> >>>>> On Sat, Aug 21, 2010 at 01:48:05PM +0000, Rui Paulo wrote: >>>>>> Author: rpaulo >>>>>> Date: Sat Aug 21 13:48:04 2010 >>>>>> New Revision: 211561 >>>>>> URL: http://svn.freebsd.org/changeset/base/211561 >>>>>> >>>>>> Log: >>>>>> Link drti.o with a PIC version of libelf. This is needed because >>>>>> drti.o depends on libelf and this avoids linking every other drti.o >>>>>> program (namely programs with USDT probes) with libelf. >>>>> What is wrong with having libelf as dependency of the resulting >>>>> binary ? >>>> >>>> The resulting binary can be a library. If I add drti.o to the libthr >>>> library, every other program will break because it can't find libelf >>>> symbols. The only way to fix it would be to rebuild every program that >>>> depends on libthr and I don't want that to happen. >>> >>> I do not understand this. If drti.o is added to a library, library should >>> also record a dependency on libelf, i.e. be linked with it. Since you >>> already modifying link command to add drti.o, what is the problem to >>> add -lelf ? >> >> I wanted the same steps to be done in FreeBSD as in Solaris. I.e., in >> I Solaris you don't need to link with -lelf your program after you >> I added DTrace probes to it believe this is a good tradeoff . > > The drawbacks of linking library statically are, at least: > - Wasted space.
This is certainly not a problem nowadays. > - Harder upgrade when libelf changes. Much harder for ports and hand- > compiled programs. > - The mess that happen when the binary also linked with -lelf, and > either your drti.o is linked, or a library that linked with its > dcrti.o. I'll try to find a way to make DTrace do the linking, if possible. Regards, -- Rui Paulo _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
