# Compiler and flags
CC := g++
CXXFLAGS := -std=c++14 -Wall -Iinclude -O3 -march=native -fopenmp
LDFLAGS  := -fopenmp


# Directories
SRC_DIR := src
INC_DIR := include
OBJ_DIR := obj
BIN_DIR := bin


#
# === Executable Name ===
TARGET := $(BIN_DIR)/abc_lab

# === Find all .cpp files recursively in src/ ===
SRCS := $(shell find $(SRC_DIR) -name '*.cpp')

# === Convert src/foo/bar.cpp → obj/foo/bar.o ===
OBJS := $(patsubst $(SRC_DIR)/%.cpp,$(OBJ_DIR)/%.o,$(SRCS))


# === OpenMP runtime configuration (override-able) ===
OMP_PROC_BIND   ?= close        # close|spread|master
OMP_PLACES      ?= cores        # cores|threads|sockets
OMP_MAX_LEVELS  ?= 1            # 1 = no nested teams; set 2+ to allow nesting
OMP_THREADS     ?= 16           # e.g. "16" or "8,4" for nested (outer,inner)
OMP_DYNAMIC     ?= true         # true/false: let runtime adjust threads
OMP_DISPLAY_ENV ?= FALSE        # TRUE to print runtime config at startup



# === Default Target ===
all: $(TARGET)

# === Linking final executable ===
$(TARGET): $(OBJS)
	@mkdir -p $(dir $@)
	$(CXX) $(CXXFLAGS) -o $@ $^ $(LDFLAGS)

# === Compiling source files to object files ===
$(OBJ_DIR)/%.o: $(SRC_DIR)/%.cpp
	@mkdir -p $(dir $@)
	$(CXX) $(CXXFLAGS) -c $< -o $@

# === Run with OpenMP env set only for the run ===
.PHONY: run
run: $(TARGET)
	OMP_PROC_BIND=$(OMP_PROC_BIND) \
	OMP_PLACES=$(OMP_PLACES) \
	OMP_MAX_ACTIVE_LEVELS=$(OMP_MAX_LEVELS) \
	OMP_NUM_THREADS="$(OMP_THREADS)" \
	OMP_DYNAMIC=$(OMP_DYNAMIC) \
	OMP_DISPLAY_ENV=$(OMP_DISPLAY_ENV) \
	./$(TARGET)

# Handy presets
.PHONY: run-single
run-single: ## Single-level parallel (good default)
	$(MAKE) run OMP_MAX_LEVELS=1 OMP_THREADS=16 OMP_PROC_BIND=close OMP_PLACES=cores

.PHONY: run-nested
run-nested: ## Two-level nested (outer,inner), adjust to your cores
	$(MAKE) run OMP_MAX_LEVELS=2 OMP_THREADS="4,8" OMP_PROC_BIND=close OMP_PLACES=cores

# Clean up
.PHONY: clean
clean:
	rm -rf $(OBJ_DIR) $(BIN_DIR)

# Optional: print debug info
.PHONY: info
info:
	@echo "Source files: $(SRCS)"
	@echo "Object files: $(OBJS)"
	@echo "CXXFLAGS: $(CXXFLAGS)"
	@echo "LDFLAGS:   $(LDFLAGS)"