[Bug ipa/64812] [4.9 regression] x86 LibreOffice Build failure: undefined reference to acquire

[mstahl at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64812

Michael Stahl <mstahl at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |dtardon at redhat dot com

--- Comment #9 from Michael Stahl <mstahl at redhat dot com> ---
(In reply to Markus Trippelsdorf from comment #8)
> Also happens with gcc-5 when linking two different LibreOffice libraries.
> (libscfiltlo.so and libooxlo.so)
> 
> The undefined symbol is:
> x4 ~ # c++filt _ZThn40_N3utl28OSeekableOutputStreamWrapper7acquireEv
> non-virtual thunk to utl::OSeekableOutputStreamWrapper::acquire()

interesting ... you are building LO 4.4.1.1 or older?

looking at the git log there is this apparent work-around:

http://cgit.freedesktop.org/libreoffice/core/commit/?id=8bb0446974282b32d06cdbd35af83f91e033b4af

not sure if it's the same bug... in case this is triggered by some sort
of de-virtualization new in GCC5 then i guess it is LO's fault
because the acquire() / release() was not dll-exported.

i will push that to the libreoffice-4-3 release branch to get it into 4.3.7.

(i've only tried to build current master, which works fine now with
workaround for the bug from the description)