Both my own builds and the 64-bit Win tinderbox @42 are now failing with the following error: [build CXX] sw/source/filter/ww8/ww8scan.cxx C:/core/sw/source/filter/ww8/ww8scan.cxx(8445): error C2220: warning treated as error - no 'object' file generated C:/core/sw/source/filter/ww8/ww8scan.cxx(8445): note: This diagnostic occurred in the compiler generated function 'WW8_FFN::WW8_FFN(const WW8_FFN &)' C:/core/sw/source/filter/ww8/ww8scan.cxx(8445): warning C4315: 'WW8_FFN': 'this' pointer for member 'WW8_FFN::sFontname' may not be aligned 8 as expected by the constructor C:/core/sw/source/filter/ww8/ww8scan.cxx(8445): note: This diagnostic occurred in the compiler generated function 'WW8_FFN::WW8_FFN(const WW8_FFN &)' make[1]: Makefile:286: recipe for target 'build' failed make: *** [build] Error 2 Tinderbox 42: https://tinderbox.libreoffice.org/cgi-bin/gunzip.cgi?tree=MASTER&brief-log=1532832601.8628 32-bit builds are successfully completing. It looks like the error was caused by: https://cgit.freedesktop.org/libreoffice/core/commit/?id=8b8fb4ac654c8f847c35b93d701ba3475662ea69 convert pFontA to std::vector