why does -flto remove stack-protector

[Reindl Harald]

Fedora 21 - GCC 4.9.2

why are shared libraries with -flto no longer have stack protection?
______________________________________________

with -flto

/usr/lib64/httpd/modules/libphp5.so:
  Position Independent Executable: no, regular shared library (ignored)
  Stack protected: no, not found!
  Fortify Source functions: yes (some protected functions found)
  Read-only relocations: yes
  Immediate binding: yes

without -flto

/usr/lib64/httpd/modules/libphp5.so:
  Position Independent Executable: no, regular shared library (ignored)
  Stack protected: yes
  Fortify Source functions: yes (some protected functions found)
  Read-only relocations: yes
  Immediate binding: yes

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 181 bytes
Desc: OpenPGP digital signature
URL: <http://lists.fedoraproject.org/pipermail/devel/attachments/20150427/93adc518/attachment.sig>