https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98232
--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> --- (In reply to Hussam Al-Tayeb from comment #4) > (In reply to Martin Liška from comment #3) > > Run build system with in a verbose mode (V=1 or VERBOSE=1), or so. > > And then for the problematic TU do -E, which will save pre-processed source > > file instead of the object file. > > Can you please tell me what to type for -E? And what is a TU? You need to display full command line where vcl/workben/vcldemo.cxx is compiler. In order to do that do: make V=1 VERBOSE=1 then take the command line and append '-E'. And attach pre-processed source file that will be in '-o xxxx.o' file.