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

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>

diff --git a/config.mk b/config.mk
index 8d47a8ea58c58422f593791b485c8dc75a026aac..f5b9c28f1da87b32995cdc9395349705d04d7175 100644 (file)
--- a/config.mk
+++ b/config.mk
@@ -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
 
 #########################################################################