From dc2142b72984d5f1c46485975c6d9396e48e0f6c Mon Sep 17 00:00:00 2001
From: Karl Palsson <karlp@tweak.net.au>
Date: Wed, 29 Aug 2018 11:54:43 +0000
Subject: [PATCH] rules: attempt rebuild of library of not found

Based on https://github.com/libopencm3/libopencm3-examples/pull/90
---
 examples/rules.mk | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/examples/rules.mk b/examples/rules.mk
index 4e730ed..c1a5dad 100644
--- a/examples/rules.mk
+++ b/examples/rules.mk
@@ -167,6 +167,12 @@ else
 include $(OPENCM3_DIR)/mk/genlink-rules.mk
 endif
 
+$(OPENCM3_DIR)/lib/lib$(LIBNAME).a:
+ifeq (,$(wildcard $@))
+	$(warning $(LIBNAME).a not found, attempting to rebuild in $(OPENCM3_DIR))
+	$(MAKE) -C $(OPENCM3_DIR)
+endif
+
 # Define a helper macro for debugging make errors online
 # you can type "make print-OPENCM3_DIR" and it will show you
 # how that ended up being resolved by all of the included
@@ -193,7 +199,7 @@ print-%:
 	@#printf "  OBJDUMP $(*).list\n"
 	$(Q)$(OBJDUMP) -S $(*).elf > $(*).list
 
-%.elf %.map: $(OBJS) $(LDSCRIPT)
+%.elf %.map: $(OBJS) $(LDSCRIPT) $(OPENCM3_DIR)/lib/lib$(LIBNAME).a
 	@#printf "  LD      $(*).elf\n"
 	$(Q)$(LD) $(TGT_LDFLAGS) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $(*).elf