path: root/arch/arm/config.mk
diff options
authorWolfgang Denk <wd@denx.de>2011-11-01 20:54:02 +0000
committerWolfgang Denk <wd@denx.de>2011-11-03 20:44:58 +0100
commitcca4e4aec1fe52e5ecd15e3cebdbb36e2f254220 (patch)
tree58737a4eeeedb099b8a71f8dfacb11a810e1d4fb /arch/arm/config.mk
parent4d6402b012b074f4658785773c97745963c52dc5 (diff)
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>
Diffstat (limited to 'arch/arm/config.mk')
1 files changed, 10 insertions, 9 deletions
diff --git a/arch/arm/config.mk b/arch/arm/config.mk
index 9b4e581b2..45f9dca5d 100644
--- a/arch/arm/config.mk
+++ b/arch/arm/config.mk
@@ -34,7 +34,7 @@ endif
# Explicitly specifiy 32-bit ARM ISA since toolchain default can be -mthumb:
-PLATFORM_CPPFLAGS += $(call cc-option,-marm,)
+PF_CPPFLAGS_ARM := $(call cc-option,-marm,)
# Try if EABI is supported, else fall back to old API,
# i. e. for example:
@@ -44,15 +44,16 @@ PLATFORM_CPPFLAGS += $(call cc-option,-marm,)
# -mabi=apcs-gnu -mno-thumb-interwork
# - with ELDK 3.1 (gcc 3.x), use:
# -mapcs-32 -mno-thumb-interwork
-PLATFORM_CPPFLAGS += $(call cc-option,\
- -mabi=aapcs-linux -mno-thumb-interwork,\
+PF_CPPFLAGS_ABI := $(call cc-option,\
+ -mabi=aapcs-linux -mno-thumb-interwork,\
+ $(call cc-option,\
+ -mapcs-32,\
$(call cc-option,\
- -mapcs-32,\
- $(call cc-option,\
- -mabi=apcs-gnu,\
- )\
- ) $(call cc-option,-mno-thumb-interwork,)\
- )
+ -mabi=apcs-gnu,\
+ )\
+ ) $(call cc-option,-mno-thumb-interwork,)\
+ )
# For EABI, make sure to provide raise()
ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))