From cca4e4aec1fe52e5ecd15e3cebdbb36e2f254220 Mon Sep 17 00:00:00 2001 From: Wolfgang Denk Date: Tue, 1 Nov 2011 20:54:02 +0000 Subject: 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 -> 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 Cc: Andy Fleming Cc: Kumar Gala Cc: Albert Aribaud cc: Graeme Russ cc: Mike Frysinger Tested-by: Graeme Russ Tested-by: Matthias Weisser Tested-by: Sanjeev Premi Tested-by: Simon Glass Tested-by: Macpaul Lin Acked-by: Mike Frysinger --- arch/arm/cpu/ixp/config.mk | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/arm/cpu/ixp/config.mk') diff --git a/arch/arm/cpu/ixp/config.mk b/arch/arm/cpu/ixp/config.mk index 5868cba..9149665 100644 --- a/arch/arm/cpu/ixp/config.mk +++ b/arch/arm/cpu/ixp/config.mk @@ -37,4 +37,5 @@ LDFLAGS_u-boot += --gc-sections # Supply options according to compiler version # # ========================================================================= -PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) +PF_RELFLAGS_SLB_AT := $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) +PLATFORM_RELFLAGS += $(PF_RELFLAGS_SLB_AT) -- cgit v1.1