[Bug c++/41596] handling of library-related options by g++spec.c causes a failure when generating pch.

["developer at sandoe-acoustics dot co dot uk" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #1 from developer at sandoe-acoustics dot co dot uk  2009-10-05 20:25 -------
Created an attachment (id=18715)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18715&action=view)
allow specification of -static-libstdc++ on the CL while generating PCH

this patch alters the behavior of g++spec.c such that it 
(a) notes if libstdc++ is needed
(b) notes if the user has requested static-libstdc++

It only outputs "-lstdc++" if the lib is needed- and when it does it decides on
the mechanism depending on the availability of static options. 

Finally, for platforms that don't have Bstatic/Bdynamic - it places
"static-libstdc++" back into the command line so that link specs can use it to
trigger substitution.

log:
      *gcc/cp/g++spec.c(lang_specific_driver): Do not insert -lstdc++ unless we
really need it.  
       Insert 'static-libstdc++' for platforms without Bstatic/Bdynamic to
allow link spec substitution.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41596