Re: __cxa_atexit for Darwin

[Geoffrey Keating <geoffk at apple dot com>]

On 18/03/2006, at 9:25 PM, Andrew Pinski wrote:

> On Mar 15, 2006, at 9:23 PM, Geoffrey Keating wrote:
>
> > Darwin has had __cxa_atexit since 10.4, but it wasn't being used by
> > default because we didn't have __dso_handle being defined by the
> > linker.  Unfortunately it also turned out to be a little buggy.  This
> > patch makes it enabled and useful by default, and supplies it even on
> > pre-10.4 systems which don't have it.  On those earlier systems it
> > isn't as good as a real system __cxa_atexit but still better than the
> > previous behaviour I hope.
> >
> > It passes a bootstrap and testrun, but I wouldn't be surprised if
> > there turns out to be a bug or two in it, so look for follow-up
> > patches.
> >
> > This requires cctools-590.36, which I've just uploaded to
> > gcc.gnu.org.
>
> This breaks bootstrap (and testing) on Mac OS X 10.3.9:
> /Users/pinskia/src/gcc/local/gcc/objdir/gcc/gcj -B/Users/pinskia/ 
> src/gcc/local/gcc/objdir/powerpc-apple-darwin7.9.0/libjava/ -B/ 
> Users/pinskia/src/gcc/local/gcc/objdir/gcc/ -g -O2 -o .libs/ 
> grmiregistry --main=gnu.java.rmi.registry.RegistryImpl -shared- 
> libgcc   -L/Users/pinskia/src/gcc/local/gcc/objdir/powerpc-apple- 
> darwin7.9.0/libjava -L/Users/pinskia/src/gcc/local/gcc/objdir/ 
> powerpc-apple-darwin7.9.0/libjava/.libs ./.libs/libgcj.dylib -L/ 
> Users/pinskia/src/gcc/local/gcc/objdir/powerpc-apple-darwin7.9.0/ 
> libstdc++-v3/src -L/Users/pinskia/src/gcc/local/gcc/objdir/powerpc- 
> apple-darwin7.9.0/libstdc++-v3/src/.libs -lpthread -ldl
> /usr/bin/ld: Undefined symbols:
> ___cxa_finalize
> collect2: ld returned 1 exit status
>
>
> Even though __cxa_finalize is weak, it must exist in the library
> which you are linking against.

It turns out that this code is wrong anyway, not better than previous  
behaviour, so there'll be a new version which will also happen not to  
need to call __cxa_finalize.

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