[Bug c/46713] -fvisibility=hidden generates broken code

[river+gcc at tamara dot tcx.org.uk]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46713

--- Comment #3 from River Tarnell <river+gcc at tamara dot tcx.org.uk> 2010-11-29 22:58:37 UTC ---
Okay, so the problem seems to be that objdump (from binutils) wasn't in $PATH
when GCC was built, which makes configure mis-detect 'as' as not supporting
.hidden when it actually does.  I rebuilt GCC with objdump, and the test case
now works fine.

However:
* The configure test should probably be more reliable; or,
* If that's not possible, then if .hidden is not detected, the resulting
compiler should still produce correct data (i.e. -fvisibility=hidden should
really be ignored)