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allow boards to customize compiler options on a per-file/dir basis

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With our Blackfin boards, we like to build the compression routines with
-O2 as our tests show a pretty good size/speed tradeoff.  For the rest of
U-Boot though, we want to stick with the default -Os as that is mostly
control code.  So in our case, we would add a line like so to the board
specific config.mk file:
	CFLAGS_lib_generic += -O2

Now all files under lib_generic/ will have -O2 appended to their build.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
This commit is contained in:
Mike Frysinger 2009-06-14 09:33:00 -04:00 committed by Wolfgang Denk
parent 92afd368bb
commit 5ec5529b82
1 changed files with 5 additions and 3 deletions
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8
config.mk
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@ -206,11 +206,13 @@ export TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
#########################################################################
# Allow boards to use custom optimize flags on a per dir/file basis
BCURDIR := $(notdir $(CURDIR))
$(obj)%.s: %.S
$(CPP) $(AFLAGS) -o $@ $<
$(CPP) $(AFLAGS) $(AFLAGS_$(@F)) $(AFLAGS_$(BCURDIR)) -o $@ $<
$(obj)%.o: %.S
$(CC) $(AFLAGS) -c -o $@ $<
$(CC) $(AFLAGS) $(AFLAGS_$(@F)) $(AFLAGS_$(BCURDIR)) -o $@ $< -c
$(obj)%.o: %.c
$(CC) $(CFLAGS) -c -o $@ $<
$(CC) $(CFLAGS) $(CFLAGS_$(@F)) $(CFLAGS_$(BCURDIR)) -o $@ $< -c
#########################################################################