# engines/fortran/Makefile
# 编译 DLL（主程序通过 ctypes 直接调用）

FC      = gfortran
FFLAGS  = -O3 -march=native -Wall -Wextra
LIB_SRC = dynamics_lib.f90

UNAME_S := $(shell uname -s 2>/dev/null || echo Windows)

ifeq ($(UNAME_S),Windows)
  STATIC_FLAGS = -static
else
  STATIC_FLAGS =
endif

ifeq ($(UNAME_S),Linux)
  DLL_TARGET = build/dynamics_f90.so
  DLL_FLAGS  = -shared -fPIC
else ifeq ($(UNAME_S),Darwin)
  DLL_TARGET = build/dynamics_f90.dylib
  DLL_FLAGS  = -dynamiclib
else
  DLL_TARGET = build/dynamics_f90.dll
  DLL_FLAGS  = -shared -fPIC
endif

.PHONY: all dll clean

all: dll

dll: $(DLL_TARGET)

$(DLL_TARGET): $(LIB_SRC) | build
	$(FC) $(FFLAGS) $(STATIC_FLAGS) $(DLL_FLAGS) -o $@ $(LIB_SRC)
	@echo "  === Fortran DLL built: $@ ==="

build:
	mkdir -p build

clean:
	rm -rf build *.o *.mod