Gentoo's Bugzilla –
Attachment 510772 Details for
Bug 640010=app-office/libreoffice-5.4.3.2 with =sys-devel/gcc-6.4.0 - .../work/libreoffice-5.4.3.2/ucb/source/ucp/ftp/ftpresultsetbase.cxx:523:1: error: comdat-local function called by virtual void ftp::ResultSetBase::setPropertyValue([..]) outside its comdat