From 3be84c5542e3392bbcf5cfe3e229fdcec4520235 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Thu, 5 Dec 2019 11:56:15 +0100
Subject: Better haskell dependency tracking in Makefile

---
 2019/.gitignore |  1 +
 2019/Makefile   | 15 ++++++++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/2019/.gitignore b/2019/.gitignore
index 3564178..ebbfb2e 100644
--- a/2019/.gitignore
+++ b/2019/.gitignore
@@ -1,4 +1,5 @@
 obj/
+.depend_hs
 1
 2
 3
diff --git a/2019/Makefile b/2019/Makefile
index a8383a3..ee0449e 100644
--- a/2019/Makefile
+++ b/2019/Makefile
@@ -5,7 +5,7 @@ CXXFLAGS = -Wall -Wextra -std=c++17 -O2
 
 OBJDIR = obj
 
-HASKELL_AUX := Input.hs
+HASKELL_AUX := Input.hs IntCode.hs
 CPP_AUX     :=
 HASKELL_SRC := $(filter-out $(HASKELL_AUX),$(wildcard *.hs))
 CPP_SRC     := $(filter-out $(CPP_AUX),$(wildcard *.cpp))
@@ -20,10 +20,10 @@ BINARIES := $(HASKELL_BIN) $(CPP_BIN)
 all: $(BINARIES)
 
 clean:
-	rm -f $(BINARIES)
+	rm -f $(BINARIES) .depend_hs
 	rm -rf $(OBJDIR)
 
-$(HASKELL_BIN): %: %.hs $(HASKELL_AUX) | $(OBJDIR)/%
+$(HASKELL_BIN): %: %.hs | $(OBJDIR)/%
 	$(GHC) $(GHCFLAGS) -odir $(OBJDIR)/$* -hidir $(OBJDIR)/$* -o $@ $<
 
 $(CPP_BIN): %: %.cpp $(CPP_AUX) | $(OBJDIR)
@@ -31,3 +31,12 @@ $(CPP_BIN): %: %.cpp $(CPP_AUX) | $(OBJDIR)
 
 $(OBJDIR)/%:
 	mkdir -p $@
+
+
+.depend_hs: $(HASKELL_SRC) $(HASKELL_AUX)
+	ghc -dep-suffix '' -dep-makefile $@ -M $(HASKELL_SRC)
+	rm -f .depend_hs.bak
+	sed 's/\.o *:/:/; s/\.hi$$/.hs/g; s/\.hi[ \t]/.hs/g' <$@ >$@.tmp
+	mv $@.tmp $@
+
+-include .depend_hs
-- 
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