[Bug c++/39242] [4.4 Regression] Inconsistent reject / accept of code

[jason at gcc dot gnu dot org]

------- Comment #12 from jason at gcc dot gnu dot org  2009-02-19 17:39 -------
(In reply to comment #10)
> What that means is that we *must not* implicitly instantiate things
> declared "extern template" unless they are DECL_DECLARED_INLINE_P.  As a
> consequence, at -O3, we cannot implicitly instantiate non-inline "extern
> template" functions.

I'm not entirely sure that's what we want it to say, but it does seem like a
reasonable expectation for users to have.

Beyond this issue, what is the compile speed impact of the earlier change to
use possibly_inlined_p?  It seems like it might be making us speculatively
instantiate a lot more functions for potential inlining even at -O1, which I
would expect to cause memory bloat and slower compilation.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39242