On Tue, 21 Jun 2022 at 20:31, thutt--- via Gcc <gcc@gcc.gnu.org> wrote: > I am here to solicit ideas on how to further narrow this this > down. Is there any undocumented option that I can use to cause the > standalone preprocessor to produce output identical to input? > Note that '-traditional-cpp' does not work because some of the code > is not recognized (variadic macros, for example).
This seems off-topic for the gcc mailing list. It belongs on the gcc-help list. Have you tried not using a standalone preprocessor? The usual approach is to add -save-temps to the gcc invocation, so it leaves the preprocessed output in a separate .i file. N.B. it's a warning, not an error. You told GCC to turn that warning into an error.
