| Stephen Gran on 7 Mar 2006 20:15:59 -0000 |
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On Tue, Mar 07, 2006 at 01:49:34PM -0500, Jeff Abrahamson said: > On Tue, Mar 07, 2006 at 03:32:14PM +0000, Stephen Gran wrote: > > glibc uses something called 'versioned symbols' - basically this > > means that when you want to use a c library function in one of your > > applications, the compiler and linker find it in the c library and > > link to it, and also link in the version of the function used. So > > you'll be linking to printf@glibc.2.3.2 instead of just linking to > > printf. Very nice, and I wish more libraries did it. > > Very neat. > > I see a bunch of discussion about versioned symbols, mostly on Debian > lists. But I don't see discussion on how to implement it in > libraries. Can you offer a pointer (e.g., a URL) on how to convert > libraries to use versioned symbols for those of us who sometimes write > libraries? It looks like very little actually does it this way > currently, but it would be nice to learn how. The short answer is, use -Wl,--version-script=libfoo.vers For a discussion of linker version scripts, take a look here: http://www.gnu.org/software/binutils/manual/ld-2.9.1/html_mono/ld.html#SEC25 It seems relatively straightforward to do manually, at first glance, but I haven't yet set up a library to do this from scratch (and the auto-foo looks daunting), so I can't be sure. -- -------------------------------------------------------------------------- | Stephen Gran | And so it was, later, As the miller | | steve@lobefin.net | told his tale, That her face, at first | | http://www.lobefin.net/~steve | just ghostly, Turned a whiter shade of | | | pale. -- Procol Harum | -------------------------------------------------------------------------- Attachment:
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