Functions (and variables I suppose) in an anonymous namespace can't
realisitically be used outside the shared library they are part of (due to the
mangled name being randomized each compile). This means that they could be of
visibility hidden, which
1) Cuts down on the amount of work for the dynamic linker
2) Means that internal calls to these functions can avoid the PLT trampoline
(and thus get higher performance)
--
Summary: (optimisation) Functions in anonymous namespaces should
default to "hidden" visibility
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: arjanv at redhat dot com
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21581
