From cd735a144ccac75282179af8dad056b5e5c0a83d Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Sun, 19 Sep 2021 22:09:23 +0200
Subject: Makefile: Coverage

---
 .gitignore |  5 +++++
 Makefile   | 32 ++++++++++++++++++++++++--------
 2 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/.gitignore b/.gitignore
index f162999..0916f62 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,8 @@ tests/run
 compile_flags.txt
 compile_commands.json
 .cache/
+
+*.gcno
+*.gcda
+*.profraw
+*.profdata
diff --git a/Makefile b/Makefile
index 2981dc0..2926f51 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CC              = clang
-CFLAGS          = -Wall -std=c89 -D_DEFAULT_SOURCE -Wvla \
+CFLAGS          = -Wall -std=c89 -D_DEFAULT_SOURCE -D_GNU_SOURCE -Wvla \
 		  -Wdeclaration-after-statement -Wstrict-prototypes \
 		  -Wunreachable-code -Wsign-compare -Wimplicit-int-conversion \
 		  -Wsign-conversion
@@ -9,7 +9,13 @@ SOURCEDIR       = src
 OBJECTDIR       = obj
 
 TESTDIR         = tests
-TESTFLAGS       = $(CFLAGS) -D_TEST
+TESTCFLAGS      = -D_TEST -g -Wall -std=c89 -D_DEFAULT_SOURCE -D_GNU_SOURCE -Wvla \
+		  -Wdeclaration-after-statement -Wstrict-prototypes \
+		  -Wunreachable-code -Wsign-compare -Wimplicit-int-conversion \
+		  -Wsign-conversion
+TESTLDFLAGS     = $(LDFLAGS) -lcheck
+
+COVCFLAGS       = -fprofile-instr-generate -fcoverage-mapping
 
 OUTPUT          = dnsd
 
@@ -27,21 +33,28 @@ build: dir $(OBJ)
 	@echo [LD] $(OBJ)
 	@$(CC) $(CFLAGS) -o $(BUILDDIR)/$(OUTPUT) $(OBJ) $(LDFLAGS)
 
-debug: CFLAGS += -g -D _DEBUG
+debug: CFLAGS += -g -D_DEBUG
 debug: build;
 
-build_test: LDFLAGS += -lcheck
 build_test: dir $(TOBJS) $(TSUBS)
 	@echo [LD] $(TOBJS) $(TSUBS)
-	@$(CC) $(TESTFLAGS) -o $(TESTDIR)/run $(TOBJS) $(TSUBS) $(LDFLAGS)
+	@$(CC) $(TESTCFLAGS) -o $(TESTDIR)/run $(TOBJS) $(TSUBS) $(TESTLDFLAGS)
 
 test: build_test
 	@$(TESTDIR)/run
 
-valgrind_test: CFLAGS += -g
 valgrind_test: build_test
 	@CK_FORK=no valgrind --leak-check=full $(TESTDIR)/run
 
+coverage: CFLAGS += $(COVCFLAGS)
+coverage: TESTLDFLAGS += -fprofile-instr-generate
+coverage: clean build_test
+	@LLVM_PROFILE_FILE="coverage.profraw" $(TESTDIR)/run
+	@llvm-profdata merge -sparse coverage.profraw -o coverage.profdata
+	@llvm-cov show $(TESTDIR)/run -instr-profile=coverage.profdata -format=html \
+		> coverage.html
+	@llvm-cov report $(TESTDIR)/run -instr-profile=coverage.profdata
+
 dir:
 	@mkdir -p $(OBJECTDIR)
 	@mkdir -p $(BUILDDIR)
@@ -52,7 +65,7 @@ $(OBJECTDIR)/%.o: $(SOURCEDIR)/%.c
 
 $(TESTDIR)/%.o: $(TESTDIR)/%.c
 	@echo [TEST] $<
-	@$(CC) $(TESTFLAGS) -c $< -o $@
+	@$(CC) $(TESTCFLAGS) -c $< -o $@
 
 #sudo setcap 'cap_net_bind_service=+ep' /path/to/prog
 #to allow port access
@@ -65,6 +78,9 @@ clean:
 	@echo [RM] $(BUILDDIR)/$(OUTPUT) $(TESTDIR)/run
 	@rm -df  $(OBJ) $(TOBJS) $(TESTDIR)/run
 	@rm -Rdf $(BUILDDIR) $(OBJECTDIR)
+	@rm -f {$(SOURCEDIR),$(TESTDIR)}/*.gc{da,no}
+	@rm -f *.prof{raw,data}
+	@rm -f coverage.html
 
 .PHONY: all
 all: clean build
@@ -75,6 +91,6 @@ devsetup:
 		echo "{\"directory\":\"$(PWD)\",\"command\":\"$(shell which $(CC)) $(CFLAGS) -c $$file\",\"file\":\"$(PWD)/$$file\"}," >> compile_commands.json;\
 	done
 	@for file in $(TESTS); do \
-		echo "{\"directory\":\"$(PWD)\",\"command\":\"$(shell which $(CC)) $(TESTFLAGS) -c $$file\",\"file\":\"$(PWD)/$$file\"}," >> compile_commands.json;\
+		echo "{\"directory\":\"$(PWD)\",\"command\":\"$(shell which $(CC)) $(TESTCFLAGS) -c $$file\",\"file\":\"$(PWD)/$$file\"}," >> compile_commands.json;\
 	done
 	@echo "]" >> compile_commands.json
-- 
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