Date: Fri, 25 Dec 2015 16:38:24 -0800 From: Colin Percival <cperciva@freebsd.org> To: Daniel Eischen <deischen@freebsd.org>, Ed Schouten <ed@nuxi.nl> Cc: src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r292723 - in head: lib/libc share/mk Message-ID: <567DE180.3040601@freebsd.org> In-Reply-To: <Pine.GSO.4.64.1512251601360.15474@sea.ntplx.net> References: <201512251129.tBPBTIZp058825@repo.freebsd.org> <CABh_MKmMT6EuKMPOan=ibL_J3zbSPSVFk5eAbuEoNr_hjBNq8Q@mail.gmail.com> <Pine.GSO.4.64.1512251601360.15474@sea.ntplx.net>
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On 12/25/15 13:03, Daniel Eischen wrote: > On Fri, 25 Dec 2015, Ed Schouten wrote: >> 2015-12-25 12:29 GMT+01:00 Colin Percival <cperciva@freebsd.org>: >>> Make libxnet.so a symlink to libc.so. This makes `-lxnet` a no-op, as >>> POSIX requires for the c99 compiler. >> >> I seem to remember I had some issues in the past where I was linking >> against libc explicitly. Maybe it had something to do with linking >> both against -lpthread and -lc, but if you pass in -lc later on the >> command line, libc overrides the symbols that have to be provided by >> -lpthread? I just did some tests with one of my pthread-using tools, and it passes all of my tests with -lc added before or after -lpthread. Can you remember any details of how the problems showed up? Is it possible that this has been fixed since then? I know there's a lot of tricks to make sure that the right versions of functions get called. >> If that's (still) the case, would it make sense to just provide >> libxnet in the form of an empty .a file instead? > > I think that's a good point. Using -lanything shouldn't introduce an > unexpected link order. Yes, adding a dummy library was my first thought, but kib pointed out that a symlink was much simpler. Obviously it never occurred to me that linking to a library which we were going to be linking to anyway would cause problems... -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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