[RFC] libstdc++/6720 and libstdc++/6671

[Paolo Carlini]

Hi all,

I'd like to ask you opinion about those two, closely related, bug 
reports, which I have triaged.

In a nutshell, it looks like the idea of giving the ext/ extension 
headers the same name of the corresponding standard headers (e.g., 
<algorithm> => <ext/algorithm>) was not so good afer all :-(

Probably, some confusion stems from entry 5.4 of the FAQ, which hints at 
the possibility of using -I: now this is not an option, since, when a 
standard header tries to include another standard header which has a 
corresponding extension in ext/, it ends up including the latter, 
instead of the former!!

In fact, as suggested in 6671, we could simply change the docs 
forbidding the use of -I. Alternatively, we could rename the new ext 
headers (perhaps just adding a .h, Nathan?) Finally, as far as hash_map, 
hash_set, rope ans slist are involved, we could suggest using -idirafter 
instead of -I (I did so in answering 6720)

Ideas?

Ciao, Paolo.