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_dir_lib_generic += -O2
Now all files under lib_generic/ will have -O2 appended to their build.
Signed-off-by: Mike Frysinger vapier@gentoo.org --- config.mk | 19 +++++++++++++------ 1 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/config.mk b/config.mk index b1254e9..5d442b5 100644 --- a/config.mk +++ b/config.mk @@ -206,23 +206,30 @@ export TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
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+# Allow boards to use custom optimize flags on a per dir/file basis +BCURDIR := $(notdir $(CURDIR)) +cmd_compile.s.S = $(CPP) $(AFLAGS) $(AFLAGS_$(@F)) $(AFLAGS_dir_$(BCURDIR)) -o $@ $< +cmd_compile.o.S = $(CC) $(AFLAGS) $(AFLAGS_$(@F)) $(AFLAGS_dir_$(BCURDIR)) -o $@ $< -c +cmd_compile.o.c = $(CC) $(CFLAGS) $(CFLAGS_$(@F)) $(CFLAGS_dir_$(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
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