[U-Boot] [PATCH/next v3] allow boards to customize compiler options on a per-file/dir basis

Mike Frysinger
2009-06-14T13:33:00Z

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>
---
v3
- updated to apply to next after Jean's changes

config.mk | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/config.mk b/config.mk
index 8d47a8e..f5b9c28 100644
--- 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

#########################################################################
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1.6.3.1