[U-Boot] [RFC/PATCH v2] allow boards to customize compiler options on a per-file/dir basis

Mike Frysinger
2009-05-18T07:06:04Z

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>
---
v2
- dont require dir_ since the naming is already unique (all objects
have a ".o" suffix while dirs do not)

config.mk | 19 +++++++++++++------
1 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/config.mk b/config.mk
index b1254e9..c3a787a 100644
--- a/config.mk
+++ b/config.mk
@@ -206,23 +206,30 @@ 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))
+cmd_compile.s.S = $(CPP) $(AFLAGS) $(AFLAGS_$(@F)) $(AFLAGS_$(BCURDIR)) -o $@ $<
+cmd_compile.o.S = $(CC) $(AFLAGS) $(AFLAGS_$(@F)) $(AFLAGS_$(BCURDIR)) -o $@ $< -c
+cmd_compile.o.c = $(CC) $(CFLAGS) $(CFLAGS_$(@F)) $(CFLAGS_$(BCURDIR)) -o $@ $< -c
+
ifndef REMOTE_BUILD

%.s: %.S
- $(CPP) $(AFLAGS) -o $@ $<
+ $(cmd_compile.s.S)
%.o: %.S
- $(CC) $(AFLAGS) -c -o $@ $<
+ $(cmd_compile.o.S)
%.o: %.c
- $(CC) $(CFLAGS) -c -o $@ $<
+ $(cmd_compile.o.c)

else

$(obj)%.s: %.S
- $(CPP) $(AFLAGS) -o $@ $<
+ $(cmd_compile.s.S)
$(obj)%.o: %.S
- $(CC) $(AFLAGS) -c -o $@ $<
+ $(cmd_compile.o.S)
$(obj)%.o: %.c
- $(CC) $(CFLAGS) -c -o $@ $<
+ $(cmd_compile.o.c)
+
endif

#########################################################################
--
1.6.3