Makefile

# Config for Post-Modern C
CXX       := g++
CXX_STD   := --std=c++26
CXX_EXTRA = -fno-rtti -fno-exceptions
CXX_FLAGS := $(CXX_STD) $(CXX_EXTRA)

CXX_FLAGS += -Isrc

MODE      ?= debug
# Default X11 as many Wayland users have XWayland
WINDOWING ?= X11

VALID_TARGETS := editor test benchmark
TARGET        ?= editor

# Other OS targets
OS := gnu_linux

ifeq ($(filter clean,$(MAKECMDGOALS)),)
  ifeq ($(filter $(TARGET),$(VALID_TARGETS)),)
    $(error TARGET must be one of: $(VALID_TARGETS))
  endif
endif

BUILD_DIR := build

SRCS := src/main.cpp
OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)

LIBS :=

# We are not using pthreads now but we'll likely use it latter
ifeq ($(OS), gnu_linux)
LIBS      += -lpthread
CXX_FLAGS += -DPLATFORM_GNU_LINUX
endif

ifeq ($(WINDOWING), X11)
CXX_FLAGS += -DPLATFORM_GNU_LINUX_X11
LIBS      += -lX11
else ifeq ($(WINDOWING), Wayland)
  CXX_FLAGS += -DPLATFORM_GNU_LINUX_WAYLAND
else
  $(error Unknown WINDOWING option: $(WINDOWING). Choose 'X11' or 'Wayland')
endif

# Werror can be annoying but it's usefull to force reasonable code
WARN_FLAGS    := -Wall -Wextra -Wpedantic -Wshadow -Werror
DBG_FLAGS     := -ggdb -Og
RELEASE_FLAGS := -Ofast -flto -march=native -DNDEBUG

ifeq ($(filter $(MODE),debug),$(MODE))
  CXX_FLAGS += $(WARN_FLAGS) $(DBG_FLAGS)
else
CXX_FLAGS += $(RELEASE_FLAGS)
LDFLAGS   += -Wl,-s
endif

BIN := $(BUILD_DIR)/$(MODE)/$(WINDOWING)/$(TARGET)

.PHONY: all clean_build clean_gcm

all: $(BIN)

$(BIN): $(OBJS)
	mkdir -p $(dir $@)
	$(CXX) $(CXX_FLAGS) $(OBJS) -o $@ $(LIBS)

$(BUILD_DIR)/%.cpp.o: %.cpp
	mkdir -p $(dir $@)
	$(CXX) $(CXX_FLAGS) -c $< -o $@

clean_build:
	rm -rf $(BUILD_DIR)

clean_gcm:
	rm -rf gcm.cache