Add Makefile flags for debugging

tools/Makefile

@@ -1,7 +1,19 @@
 .PHONY: all clean
 
 CC := gcc
-CFLAGS := -O3 -flto -std=c11 -Wall -Wextra -pedantic
+CFLAGS := -g -ggdb3 -O3 -flto -std=c11 -Wall -Wextra -pedantic \
+		-Walloc-zero -Wcast-align -Wcast-qual -Wduplicated-branches -Wduplicated-cond \
+		-Wfloat-equal -Wlogical-op -Wnull-dereference -Wshift-overflow=2 \
+		-Wstringop-overflow=4 -Wundef -Wuninitialized -Wunused -Wshadow \
+		-Wformat=2 -Wformat-overflow=2 -Wformat-truncation=1 \
+		-Wno-format-nonliteral -Wno-strict-overflow -Wno-unused-but-set-variable \
+		-Wno-type-limits -Wno-tautological-constant-out-of-range-compare \
+		-D_GLIBCXX_ASSERTIONS \
+		-fsanitize=shift -fsanitize=integer-divide-by-zero \
+		-fsanitize=unreachable -fsanitize=vla-bound \
+		-fsanitize=signed-integer-overflow -fsanitize=bounds \
+		-fsanitize=object-size -fsanitize=bool -fsanitize=enum \
+		-fsanitize=alignment -fsanitize=null -fsanitize=address
 
 tools := \
 	gfx \