https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63178
Dima Kogan <gccbugs at dima dot secretsauce.net> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |RESOLVED Resolution|--- |INVALID --- Comment #7 from Dima Kogan <gccbugs at dima dot secretsauce.net> --- Hi. Thank you once again for replying, Marek. I just looked into this a bit more deeply, and it appears that this is some sort of ccache artifact. Running without ccache I see the warning with all versions of gcc that I have tried. With ccache, the warning is missing for all gcc-4.9 and gcc-4.8 that I have, but it IS there with gcc-4.4. So this sounds like a bug in ccache and not gcc. Sorry for the false alarm and thank you very much for looking.