[PATCH] [BZ #18970]: Reference of pthread_setcancelstate in libc.a

[Joseph Myers]

On Thu, 17 Sep 2015, Roland McGrath wrote:

> > Is this a valid test?
> 
> No.  There should be no need for individual tests like that.  The
> linknamespace tests should catch such things if the conform data is correct
> (and if it's not, the right thing is to fix the conform data).

See one of the caveats listed in linknamespace.pl:

# * Weak undefined symbols are ignored; however, if a code path that
# references one (even just to check if its address is 0) is executed,
# that may conflict with a definition of that symbol in the user's
# program.

I don't know what combination of false positives and real problems you'd 
find if linknamespace.pl stopped special-casing weak symbols.

> AFAIK fmtmsg is only specified in standards that put all POSIX.1 symbols
> (including pthread_setcancelstate) in the implementation name space.

fmtmsg is in XPG4, which doesn't have pthreads.

-- 
Joseph S. Myers
joseph@codesourcery.com