> -----Original Message-----
> From: u-boot-boun...@lists.denx.de
> [mailto:u-boot-boun...@lists.denx.de] On Behalf Of Wolfgang Denk
> Sent: Wednesday, November 02, 2011 12:24 PM
> To: u-boot@lists.denx.de
> Cc: Graeme Russ; Kumar Gala; Albert Aribaud; Andy Fleming
> Subject: [U-Boot] [PATCH] Reduce build times
>
> U-Boot Makefiles contain a number of tests for compiler features etc.
> which so far are executed again and again. On some architectures
> (especially ARM) this results in a large number of calls to gcc.
>
> This patch makes sure to run such tests only once, thus largely
> reducing the number of "execve" system calls.
>
> Example: number of "execve" system calls for building the "P2020DS"
> (Power Architecture) and "qong" (ARM) boards, measured as:
> -> strace -f -e trace=execve -o /tmp/foo ./MAKEALL <board>
> -> grep execve /tmp/foo | wc -l
>
> Before: After: Reduction:
> ==================================
> P2020DS 20555 15205 -26%
> qong 31692 14490 -54%
>
> As a result, built times are significantly reduced, typically by
> 30...50%.
>
> Signed-off-by: Wolfgang Denk <w...@denx.de>
> Cc: Andy Fleming <aflem...@gmail.com>
> Cc: Kumar Gala <ga...@kernel.crashing.org>
> Cc: Albert Aribaud <albert.arib...@free.fr>
> cc: Graeme Russ <graeme.r...@gmail.com>
> cc: Mike Frysinger <vap...@gentoo.org>
> ---
Results for OMAP3EVM.
(Tried 5 times just to be sure as I see >50% reduction.)
Before After
------ ------
real 109.03 49.78
user 71.43 29.06
sys 26.83 7.66
Compiled u-boot works fine on the board as well.
Tested-by: Sanjeev Premi <pr...@ti.com>
[snip]...[snip]
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