Hi Jakub, Jakub Jelinek <ja...@redhat.com> writes:
> Especially in recent GCC versions the amount of differences for warnings and > errors keeps dramatically increasing, with separate preprocessing simply > too much information is lost (macro contexts, lint style comments, exact > locations, system header issues, ...). > > So it is far better to not use -E, but instead -E -fdirectives-only > for the preprocessing step, which will get you also single file with all the > includes in it, but macros, comments etc. are still in there. Uh, thanks, that's very helpful. One use case for removing comments is detecting and ignoring comments-only changes (via a checksum). But that's relatively minor. We could probably re-process the result ourselves and strip the comments for that (will have to recognize comments for the C++ module import detection anyway). Also, preserving comments helps with some VC issues (e.g., a/**/b). > Tried to explain that to the ccache people, but they aren't listening. I am, on the hand, all ears ;-). Thanks, Boris
