Waf branch - Overview [2/6]

[Sebastian Huber]

On 08/02/15 16:22, Amar Takhar wrote:
>> >What doesn't get noticed is the change of a C library header file, e.g.
>> ><string.h>. This worked before due to the automatically generated
>> >dependency files emitted by GCC.
> Currently it only monitors files in the top source directory.  Scanning headers
> outside of the top srcdir will be slow.
>
> I can add a knob to enable this on-demand but I would not want to leave it on as
> how often are we editing system headers?  It's a nontrivial slowdown of the
> build.
>
> It may be possible to cache the system header hashes during configure to speedup
> the build later... how important is it to have this on all the time?  I have yet
> to run into a situation where it was imperative to have it always-enabled.

It is not important to have this on all the time. Its more for people 
who regularly install new tool chains, so not the standard RTEMS user. A 
waf config time option would be nice.

-- 
Sebastian Huber, embedded brains GmbH

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