When using the '-MD' to gcc, a dep file is produced along side the object file. In ccache, this dep file is copied after the object file is copied, resulting a newer mtime for the dep file than the object file. I believe this is an issue for makefiles with rules like:
foo.o: foo.c gcc -c -MD ... foo.o: foo.d When running 'make' twice consecutively, it's expected that the second time doesn't do anything since everything is up to date (this is the behavior when not using ccache). However, since ccache generates the dep file which (sometimes) has a newer mtime than the object file, 'make' determines that 'foo.o' needs to be rebuilt, due to the second rule above. I think the fix is pretty simple (I've been adding an "update_mtime(output_obj);" if a dep file is produce). What would be the best way to send diffs/patches for bug fixes like this? Thanks, Andrew _______________________________________________ ccache mailing list ccache@lists.samba.org https://lists.samba.org/mailman/listinfo/ccache