Re: version scripts and symbol prefixes

[Mike Frysinger]

On Tuesday 29 May 2007, Peter O'Gorman wrote:
> On Tue, 2007-05-29 at 19:17 -0400, Mike Frysinger wrote:
> > On Tuesday 29 May 2007, Peter O'Gorman wrote:
> > > On May 29, 2007, at 1:59 AM, Mike Frysinger wrote:
> > > > i just came across libupnp which uses some libtool functionality to
> > > > generate a
> > > > list of exported symbols and pass it to ld so that only the ones
> > > > that are
> > > > part of the ABI get exported ... however, this code doesnt take
> > > > symbol prefixes into account so in my case, the generated library
> > > > doesnt include any
> > > > global symbols ;(
> > > >
> > > > libupnp is using libtool-1.5.22 but a quick glance at current CVS
> > > > head indicates this is still a problem ... can someone correct me ? 
> > > > i'd just run
> > > > a small cpp test and see what __USER_LABEL_PREFIX__ is set to ..
> > > > gcc always
> > > > defines this and in my case, it's:
> > > > #define __USER_LABEL_PREFIX__ _
> > > > unless someone has some cool ld/as/string foo to perform a similar
> > > > test on
> > > > object code ...
> > >
> > > What system are you running on?
> >
> > build = powerpc-linux-gnu
> > host = bfin-linux-uclibc
>
> Ok, currently libtool "checks for" that underscore by looking at the
> host_os. Using __USER_LABEL_PREFIX__ when building with gcc seems like a
> much better plan.
>
> I'll try to make some libtool time this week and come up with a patch
> for this. In the meantime, look at libtool.m4 and see how interix and
> darwin deal with this issue, maybe you can come up with something that
> will work for your host. Look for 's,^,_,' to find it.

ah, good tip ... i see the tweaks i need to make for bfin* based on the Darwin 
stuff ... thanks for looking into this, if you need help testing with a real 
target i'm here :)
-mike

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