netdev - Re: [PATCH iproute2-next] Makefile: pass -pipe to the compiler

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Message-ID: <20190611122800.56d72eba@hermes.lan>
Date:   Tue, 11 Jun 2019 12:28:00 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Matteo Croce <mcroce@...hat.com>
Cc:     netdev@...r.kernel.org, David Ahern <dsahern@...nel.org>
Subject: Re: [PATCH iproute2-next] Makefile: pass -pipe to the compiler

On Tue, 11 Jun 2019 20:05:13 +0200
Matteo Croce <mcroce@...hat.com> wrote:

> Pass the -pipe option to GCC, to use pipes instead of temp files.
> On a slow AMD G-T40E CPU we get a non negligible 6% improvement
> in build time.
> 
> real    1m15,111s
> user    1m2,521s
> sys     0m12,465s
> 
> real    1m10,861s
> user    1m2,520s
> sys     0m12,901s
> 
> Signed-off-by: Matteo Croce <mcroce@...hat.com>

Why bother, on my machine (make -j12).

Before
real	0m6.320s
user	0m30.674s
sys	0m3.649s


After (with -pipe)
real	0m6.158s
user	0m31.197s
sys	0m3.532s


So it is slower. Get a faster disk :-)

Maybe allow "EXTRA_CFLAGS" to be passed to Makefile for those that
have a burning need for this.