From d14033c744b11d86069d9e71ab60eeb407faec61 Mon Sep 17 00:00:00 2001
From: Christian Tacke <Christian.Tacke+libopencm3@cosmokey.com>
Date: Mon, 26 Feb 2018 20:43:00 +0100
Subject: [PATCH] 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
---
 mk/genlink-config.mk | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mk/genlink-config.mk b/mk/genlink-config.mk
index b2dfb3c6..6935ec9b 100644
--- a/mk/genlink-config.mk
+++ b/mk/genlink-config.mk
@@ -56,9 +56,11 @@ endif
 # where those are provided by different means
 ifneq (,$(wildcard $(OPENCM3_DIR)/lib/libopencm3_$(genlink_family).a))
 LDLIBS += -lopencm3_$(genlink_family)
+LIBDEPS += $(OPENCM3_DIR)/lib/libopencm3_$(genlink_family).a
 else
 ifneq (,$(wildcard $(OPENCM3_DIR)/lib/libopencm3_$(genlink_subfamily).a))
 LDLIBS += -lopencm3_$(genlink_subfamily)
+LIBDEPS += $(OPENCM3_DIR)/lib/libopencm3_$(genlink_subfamily).a
 else
 $(warning $(OPENCM3_DIR)/lib/libopencm3_$(genlink_family).a library variant for the selected device does not exist.)
 endif