From 2eb7b3c2f195c568b7c6da10d11eff7423e989b3 Mon Sep 17 00:00:00 2001
From: omicron <omicron.me@protonmail.com>
Date: Sat, 5 Apr 2025 21:46:09 +0200
Subject: [PATCH] use llvm to generate test coverage

---
 make/test.mk | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/make/test.mk b/make/test.mk
index 464ecb4..b7a00eb 100644
--- a/make/test.mk
+++ b/make/test.mk
@@ -1,9 +1,21 @@
 .PHONY: test
 
+CFLAGS?=-Wall -Wextra -Wpedantic -O0 -g3 -std=c23 -fno-omit-frame-pointer -fno-optimize-sibling-calls -D_POSIX_C_SOURCE=200809L -fprofile-instr-generate -fcoverage-mapping
+LDFLAGS?=-fprofile-instr-generate
 BUILD_DIR=build/test/
 TARGET=oas-tests
 SOURCES = $(filter-out src/main.c, $(shell find src/ tests/ -type f -name '*.c'))
 -include make/base.mk
 
 test: $(BUILD_DIR)$(TARGET)
-	$(BUILD_DIR)$(TARGET)
+	mkdir -p reports/coverage
+	LLVM_PROFILE_FILE="reports/coverage/tests.profraw" $(BUILD_DIR)$(TARGET)
+	llvm-profdata merge -sparse reports/coverage/tests.profraw -o reports/coverage/tests.profdata
+	llvm-cov show $(BUILD_DIR)$(TARGET) -instr-profile=reports/coverage/tests.profdata -format=html -output-dir=reports/coverage/html -ignore-filename-regex="tests/.*"
+	@echo "--"
+	@echo "Test coverage:"
+	@echo "file://$$(realpath reports/coverage/html/index.html)"
+	@echo "--"
+
+clean:
+	rm -rf reports/coverage