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 --- config.mk | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'config.mk') diff --git a/config.mk b/config.mk index 11b67e540e..918cffe3eb 100644 --- a/config.mk +++ b/config.mk @@ -209,11 +209,13 @@ else CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes endif -CFLAGS += $(call cc-option,-fno-stack-protector) +CFLAGS_SSP := $(call cc-option,-fno-stack-protector) +CFLAGS += $(CFLAGS_SSP) # Some toolchains enable security related warning flags by default, # but they don't make much sense in the u-boot world, so disable them. -CFLAGS += $(call cc-option,-Wno-format-nonliteral) -CFLAGS += $(call cc-option,-Wno-format-security) +CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \ + $(call cc-option,-Wno-format-security) +CFLAGS += $(CFLAGS_WARN) # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g # option to the assembler. -- cgit v1.2.1