basic_string.tcc contains 'extern template basic_string<char>', which prevents
the template from being instantiated, and thus all calls to basic_string
methods remain calls even at -O3.
If I -D_GLIBCXX_DEBUG=1 _GLIBCXX_EXTERN_TEMPLATE is 0, thus it will no longer
contain 'extern template basic_string<char>', so the body of methods will be
available, and inlining will be performed.
However _GLIBCXX_DEBUG=1 activates debug code, so I would like to be able to
get the methods inlined w/o definining debug mode.
Can the semantics of 'extern template' be changed [*] in such a way, that *if*
the body of some of the methods are suitable for inlining, they will be inlined
(and other methods won't get instantiated), and if none of the methods are
suitable, the behaviour stays as currently.
[*] by introducing a new compiler flag, that can be activated at -O3 (and maybe
-O2) at the expense of code size.
--
Summary: std::string is faster with -D_GLIBCXX_DEBUG=1 than
without
Product: gcc
Version: 4.3.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: edwintorok at gmail dot com
GCC build triplet: x86_64-linux-gnu
GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38132
