From 2061167bd925b0b4197c35ada5476de2e560214d Mon Sep 17 00:00:00 2001
From: Johny Mattsson <jmattsson@dius.com.au>
Date: Mon, 3 Jul 2017 13:29:47 +1000
Subject: [PATCH] Add check for unresolved-but-unused symbols at build.

From what I can tell they *should* be harmless, but I'd rather we keep a
neat house in the first place.
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 28b69fec..5380a86e 100644
--- a/Makefile
+++ b/Makefile
@@ -188,6 +188,7 @@ endef
 
 $(BINODIR)/%.bin: $(IMAGEODIR)/%.out
 	@mkdir -p $(BINODIR)
+	@$(NM) $< | grep -w U && { echo "Firmware has unresolved (but unused) symbols - should be fixed nevertheless!"; exit 1; } || true
 	$(ESPTOOL) elf2image --flash_mode dio --flash_freq 40m $< -o $(FIRMWAREDIR)
 
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