path: root/examples/standalone
diff options
authorWolfgang Denk <>2011-11-01 20:54:02 +0000
committerWolfgang Denk <>2011-11-03 20:44:58 +0100
commitcca4e4aec1fe52e5ecd15e3cebdbb36e2f254220 (patch)
tree58737a4eeeedb099b8a71f8dfacb11a810e1d4fb /examples/standalone
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 <> 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 <>
Diffstat (limited to 'examples/standalone')
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)
all: $(obj).depend $(OBJS) $(LIB) $(SREC) $(BIN) $(ELF)
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