From 65ba8e4c07b25f218b905819b989b5d23d92f723 Mon Sep 17 00:00:00 2001
From: uvok
Date: Thu, 25 Dec 2025 10:51:48 +0100
Subject: makefile: Try fix dep rule

---
 Makefile | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 4dbe558..5f3d026 100644
--- a/Makefile
+++ b/Makefile
@@ -8,6 +8,10 @@ CST ?= tangnano9k.cst
 FLASH_OPTS ?=
 YOSYS_OPTS ?= -Q -q -l $(PROGRAM).yosys.log
 DEPS := $(wildcard *.dep)
+# this is "bad", as it runs the deps target every time
+# probably because of the include below
+# SOURCES := $(wildcard *.v)
+# DEPS := $(SOURCES:.v=.dep)
 
 # yosys deps-file doesn't work, it writes ": infile depfiles"
 #-E $(PROGRAM).deps
@@ -30,19 +34,22 @@ flash: $(PROGRAM).fs
 	openFPGALoader -b tangnano9k  $(FLASH_OPTS) $(PROGRAM).fs
 
 clean:
-	rm -rf *.json *.fs *.svg *.log *.deps
+	rm -rf *.json *.fs *.svg *.log *.dep
 
 synth: $(PROGRAM).json
 
-deps: $(PROGRAM).deps
+deps: $(DEPS)
 
 ## Patterns
 
 # synthesize
-%.json: %.v
+# re-synth if deps change (and create in the first place)
+%.json: %.v %.dep
 	yosys -p "read_verilog $<; synth_gowin -top $* -json $@" $(YOSYS_OPTS) 
 
-%.deps: %.v
+# because yosys -E is buggy, or behaves differently than expected,
+# use gawk to force-create deps.
+%.dep: %.v
 	gawk 'match($$0, /`include "(.*)"/, ary) {print FILENAME, ":", ary[1]}'  $< > $@
 
 # place and route?
-- 
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