Does u-boot provide the ability to change compilation options 'on the fly', say when certain files need to be compiled for symbolic debugging? I looked but did not find any.

How about something like this:

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv $ git diff config.mk diff --git a/config.mk b/config.mk index 853e6d8..41cafbb 100644 --- a/config.mk +++ b/config.mk @@ -406,7 +406,7 @@ $(obj)%.o: %.c ifneq ($(CHECKSRC),0) $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $< endif - $(CC) $(ALL_CFLAGS) -o $@ $< -c + $(CC) $(ALL_CFLAGS) $(CPP_$(subst .,_,$<)) -o $@ $< -c $(obj)%.i: %.c $(CPP) $(ALL_CFLAGS) -o $@ $< -c $(obj)%.s: %.c ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Then, say I want to have spl_boot.c compiled with extra flags, just invoking make like this does the trick:

CPP_spl_boot_c='-O0 -fno-default-inline' make ...

Or is there a better way?

--vb