Installworld and /usr/include/*.h modification times

[Lowell Gilbert]

Kimmo Paasiala <kpaasial at gmail.com> writes:

> Why are /usr/include files installed with "install -C" during "make
> installworld"  when almost everything else is installed without the -C
> flag? This makes it harder to track which files were actually
> installed during the last "make installworld". One can easily find
> obsolete files  (that are not covered with make delete-old(-libs))
> with "find -x / -type f -mtime +suitable_time" but this doesn't work
> for /usr/include files because the modification times are not bumped
> on "make installworld".

"make" uses timestamps to determine whether to trigger a rule. Changing
timestamps on source files without changing the contents is a bad idea.