[Bug 216206] editors/openoffice-4 and editors/openoffice-devel: fails to build with clang 4.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216206

Don Lewis <truckman at FreeBSD.org> changed:

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                 CC|                            |truckman at FreeBSD.org

--- Comment #14 from Don Lewis <truckman at FreeBSD.org> ---
(In reply to Pedro F. Giffuni from comment #2)

I used a poudriere jail running the /projects/clang400-import/ branch to track
down some more openoffice build problems with clang 4.0.

In all cases the code looked like:
  somestruct *obj = new somestruct ();

It turns out that clang 4.0 tries to use SSE instructions to zero the memory
block returned by new, which requires that the memory be 16-byte aligned, but
our malloc implementation only does 8-byte alignment.  If the memory isn't
sufficiently aligned, then we get a bus error core dump.

I wasn't able to provoke our malloc() implementation into returning an
unaligned pointer for objects of 16 bytes or larger, but I see that AOO
redefines new and uses its own memory allocator.

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