https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83372
--- Comment #2 from Alan Griffiths <alan at octopull dot co.uk> --- Created attachment 42841 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42841&action=edit Preprocessed source So far, I've only seen the error on "builders" where I don't have access (i.e. I've so far failed to reproduce "locally"). The attached preprocessed source comes from adapting the compile command shown in the build log and running that locally. I'm told the error also appears on Fedora 27 32bit builds, but intermittently.