Bug 23529: Add support for gcc's attribute abi_tag (needed for compatibility with gcc 5's libstdc++)

[David Majnemer via cfe-commits]

Would you mind sticking abi-tag.patch in phabricator:
http://llvm.org/docs/Phabricator.html ?
Your patch is big enough that it would make it a little easier for me to
review.

On Sat, Sep 12, 2015 at 7:12 AM, Stefan Bühler via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

> Hi all,
>
> I've been working on #23529.
>
> The abi tag mangling implemented by gcc is horrible, but I think my
> patch covers most of the incompatibilities with gcc5.
>
> There might be some bugs with substitutions, although I have to come up
> with a test case for that to see what gcc does...
>
> Test cases comparing gcc and patched clang++:
> http://files.stbuehler.de/test-itanium-mangle.html
> (generated with http://files.stbuehler.de/test-itanium-mangle.sh, also
> attached)
>
> regards,
> Stefan
>
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