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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/64956] [5 Regression] __GXX_ABI_VERSION needs a proper definition for the 5.x releases
Date: Fri, 13 Feb 2015 14:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64956

--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Matthias Klose from comment #3)
> #if !defined(__GXX_ABI_VERSION) || __GXX_ABI_VERSION != 1002
> #error The C++ ABI version of compiler you are using does not match
> #error that of the compiler used to build the library. The versions
> #error must match or your program will not work correctly.
> #error The Xapian library was built with g++ 4.9.1
> #endif

I would expect that Xapian built with -fabi-version=2 and -fabi-version=8
should be compatible; the only changes to the compiler ABI are mangling, which
with a template library probably only leads to a bit of code bloat from
duplicated functions with different names.  I suppose there could be runtime
issues if there are variables mangled differently, but that's less likely.