# libhl2hake.so — 32-bit Source Engine plugin.
#
#   make            release build (build/release, -O2)
#   make debug      build/debug with -O0 -g (symbolise crash addresses)
#   make clean
#
# Needs a 32-bit multilib toolchain (g++-multilib on Debian/Ubuntu).

CXX      ?= g++
OUT      := libhl2hake.so
SRC      := $(wildcard src/*.cpp)
ODIR     ?= build/release
OPT      ?= -O2

CXXFLAGS := -m32 -std=c++17 -Wall -Wextra -Werror -fPIC \
            -fvisibility=hidden -fno-omit-frame-pointer -pthread \
            -MMD -MP $(OPT)
LDFLAGS  := -m32 -shared -pthread -Wl,--no-undefined
LDLIBS   := -ldl

OBJ := $(patsubst src/%.cpp,$(ODIR)/%.o,$(SRC))
DEP := $(OBJ:.o=.d)

all: check $(OUT)
	@file $(OUT)
	@test -f assets/LiberationSans-Regular.ttf || \
	  echo "warning: assets/ is missing next to the .so; the overlay falls back to system fonts" >&2

# Objects, dependency files and headers are handled by make itself; this only
# keeps the debug build in its own directory.
debug:
	@$(MAKE) --no-print-directory ODIR=build/debug OPT="-O0 -g"

# Always relink. Both configs write the same output file, so without this a
# plain `make` after `make debug` would keep the debug binary (the .so is newer
# than the release objects). Linking is sub-second.
.PHONY: FORCE
FORCE:

$(OUT): $(OBJ) FORCE
	$(CXX) $(LDFLAGS) -o $@ $(OBJ) $(LDLIBS)

$(ODIR)/%.o: src/%.cpp | $(ODIR)
	$(CXX) $(CXXFLAGS) -c $< -o $@

$(ODIR):
	@mkdir -p $@

# Fail once with a usable message instead of a wall of compiler errors.
.PHONY: check
check:
	@printf 'int main(){return 0;}\n' | \
	  $(CXX) -m32 -x c++ - -o /dev/null 2>/dev/null || \
	  { echo "error: $(CXX) cannot build 32-bit binaries; install g++-multilib" >&2; exit 1; }

.PHONY: all debug clean
clean:
	rm -rf build $(OUT)

-include $(DEP)