first commit, initial layout and some ideas I want to implement, included my linked list impl

make/toolchain.mk

@@ -0,0 +1,31 @@
+CC ?= cc
+AR ?= ar
+RANLIB ?= ranlib
+
+CSTD   := -std=c11
+WARN   := -Wall -Wextra -Wpedantic -Wshadow -Wconversion -Wstrict-prototypes -Wmissing-prototypes
+DEFS   := -D_POSIX_C_SOURCE=200809L
+
+INCS   := $(addprefix -I,$(INC_DIRS))
+
+CFLAGS_COMMON := $(CSTD) $(WARN) $(DEFS) $(INCS)
+LDFLAGS_COMMON :=
+LDLIBS_COMMON  :=
+
+ifeq ($(MODE),release)
+  CFLAGS_MODE := -O2 -DNDEBUG
+else ifeq ($(MODE),debug)
+  CFLAGS_MODE := -O0 -g3
+else ifeq ($(MODE),asan)
+  CFLAGS_MODE := -O1 -g3 -fsanitize=address -fno-omit-frame-pointer
+  LDFLAGS_MODE := -fsanitize=address
+else ifeq ($(MODE),ubsan)
+  CFLAGS_MODE := -O1 -g3 -fsanitize=undefined -fno-omit-frame-pointer
+  LDFLAGS_MODE := -fsanitize=undefined
+else
+  $(error Unknown MODE=$(MODE))
+endif
+
+CFLAGS  := $(CFLAGS_COMMON) $(CFLAGS_MODE)
+LDFLAGS := $(LDFLAGS_COMMON) $(LDFLAGS_MODE)
+LDLIBS  := $(LDLIBS_COMMON)