https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114980
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- -fdiagnostics-plain-output does: /* If you have changed the default diagnostics output, and this new output is not appropriately "plain" (e.g., the change needs to be undone in order for the testsuite to work properly), then please do the following: 1. Add the necessary option to undo the new behavior to the array below. 2. Update the documentation for -fdiagnostics-plain-output in invoke.texi. */ const char *const expanded_args[] = { "-fno-diagnostics-show-caret", "-fno-diagnostics-show-line-numbers", "-fdiagnostics-color=never", "-fdiagnostics-urls=never", "-fdiagnostics-path-format=separate-events", "-fdiagnostics-text-art-charset=none" };