Miscompilation of glibc with CVS mainline

[Martin v. Löwis]

prj@po.cwru.edu (Paul Jarc) writes:

> > Isn't this going to cause a problem with the gcc weak extension
> 
> Any program that uses the weak extension is violating the standard, so
> gcc is allowed to also violate the standard in a useful way in such a
> case.  

More precisely, it's not a violation, it is an extension (4p8); a
conforming implementation must document what the extensions are and
must diagnose usage of extensions.

For the GCC weak extension, the relevant clause of the standard does
not apply: in a strictly conforming program, the weak extension cannot
be used. The GCC documentation fails to mention that taking the
address of a weak function may yield a null pointer; this is a
documentation bug.

Regards,
Martin