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 <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-by: Graeme Russ <graeme.russ@gmail.com>
Tested-by: Matthias Weisser <weisserm@arcor.de>
Tested-by: Sanjeev Premi <premi@ti.com>
Tested-by: Simon Glass <sjg@chromium.org>
Tested-by: Macpaul Lin <macpaul@gmail.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/config.mk b/config.mk
index 11b67e5..918cffe 100644
--- a/config.mk
+++ b/config.mk
@@ -209,11 +209,13 @@
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<format>
# option to the assembler.