[Bug 157] using -O{1,2,3} together with -g causes ICE (seg fault)

[via D.gnu]

https://bugzilla.gdcproject.org/show_bug.cgi?id=157

--- Comment #6 from Johannes Pfau <johannespfau at gmail.com> ---
> Are you sure?  I mean, if this is a nested instantiation, then it will be treated as non-public (static in the C sense).  So any unreferenced functions will be removed by the middle-end.

It doesn't even show up in -fdump-tree-original though and I think it should be
there? Also the toChars function is not a nasted template (See conv.d in the
attached test case). And the backend still emits an 'undefined' reference so
this is not a case of completely removing the symbol.

> But at the same time, I'd like to minimise just how much effort is put into the older versions.  Granted that they should be effectively in maintenance mode by now. ;-)

Indeed. 'Usually' such problems don't appear though and backports are a simple
git merge.

> Looking at 4.9, I see that the same patch was applied as version 5.  So I was initially unsure why you have a problem.

OK, I see. Removing !lto worked around the problem, but it will then probably
trigger the other regression you linked ;-)

> The "proper" fix is already done in master (calling register_main_translation_unit), so I assume this is in all branches up to gcc-5 as well.

register_main_translation_unit is not in gcc 4.9 or 4.8, it was introduced in
gcc-5 to fix the follow-up bug you linked. Not sure if I want to introduce such
changes into our GCC patches though...

Maybe I'll just disable debug info generation when building phobos and keep
this as a won't fix for < 4.9.

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