Christian Tacke d14033c744 genlink: provide LIBDEPS for libopencm3 itself ...

If $(OPENCM3_DIR)/lib/libopencm3_*.a exists, it will be linked in.
If we do that, we should also add it to the deps.
That way a newer *.a will result in a relink.

To use this, you should add a dependency to $(LIBDEPS) where you are
using $(LDFLAGS) and $(LDLIBS) now.

eg, old (wouldn't relink if the library changed)

$(PROJECT).elf: $(OBJS) $(LDSCRIPT)
        @printf "  LD\t$@\n"
        $(Q)$(LD) $(TGT_LDFLAGS) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $@

new (will relink when the library changes)

$(PROJECT).elf: $(OBJS) $(LDSCRIPT) $(LIBDEPS)
        @printf "  LD\t$@\n"
        $(Q)$(LD) $(TGT_LDFLAGS) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $@

Tested-by:  Karl Palsson <karlp@tweak.net.au>

Originally tracked via: https://github.com/libopencm3/libopencm3/pull/887

2018-08-17 00:15:01 +00:00

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