Hi Wolfgang,
On 02/11/11 17:54, Wolfgang Denk wrote:
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 wd@denx.de Cc: Andy Fleming afleming@gmail.com Cc: Kumar Gala galak@kernel.crashing.org Cc: Albert Aribaud albert.aribaud@free.fr cc: Graeme Russ graeme.russ@gmail.com cc: Mike Frysinger vapier@gentoo.org
Tested on x86, does what is written on the box ;)
Tested-by: Graeme Russ graeme.russ@gmail.com
Regards,
Graeme