Build only changes

[Alexander Kuleshov]

Hello Konstantin.

On Mon, Nov 30, 2015 at 7:42 PM, Konstantin Belousov
<kostikbel at gmail.com> wrote:
>> Thank you for reply, but anyway it's too long to wait. Would great to have
>> options for skipping contrib/, usr.bin/ and other non-related to
>> changes directories,
>> but unfortunately didn't see it in Makefiles.
>
> If you already finished buildworld, it is usually easiest and fastest
> to execute make buildenv with the same options as buildworld (I mean
> things like TARGET/TARGET_ARCH and similar), then, in the shell prompt,
> do
> # cd usr.bin/program
> # make
>
> I use this when working e.g. on rtld and libc/libthr.  A useful variation
> is
> # make DEBUG_FLAGS=-g WITHOUT_TESTS=yes

Thank you for advice.

Besides this just knew about src.conf and add some WITHOUT_.* options
there and now is much better.