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| author | Wolfgang Denk <wd@denx.de> | 2011-11-01 20:54:02 +0000 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2011-11-03 20:44:58 +0100 |
| commit | cca4e4aec1fe52e5ecd15e3cebdbb36e2f254220 (patch) | |
| tree | 58737a4eeeedb099b8a71f8dfacb11a810e1d4fb /examples | |
| parent | 4d6402b012b074f4658785773c97745963c52dc5 (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 'examples')
| -rw-r--r-- | examples/standalone/Makefile | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/examples/standalone/Makefile b/examples/standalone/Makefile index b1e33fba73..e23865b4b0 100644 --- a/examples/standalone/Makefile +++ b/examples/standalone/Makefile @@ -85,7 +85,8 @@ endif # We don't want gcc reordering functions if possible. This ensures that an # application's entry point will be the first function in the application's # source file. -CFLAGS += $(call cc-option,-fno-toplevel-reorder) +CFLAGS_NTR := $(call cc-option,-fno-toplevel-reorder) +CFLAGS += $(CFLAGS_NTR) all: $(obj).depend $(OBJS) $(LIB) $(SREC) $(BIN) $(ELF) |