Swift & C (Part 3: mix compile)

[nonocast]

通过Xcode可以很方便的在swift项目中加入bridge header和c file，通过命令行也可以实现, 下面介绍的方式是我个人尝试，未必是标准答案，辩证理解:

• 通过gcc/clang -c编译c生成object file
• swiftc通过同时输入swift和object file
• 通过import-obj-header增加bridge文件

src/main.swift

import Foundation

func main() {
  let version = RTMP_LibVersion()
  print(String(format: "0x%08x", version))
  hello()
}

main()

src/bridge.h

#include "librtmp/amf.h"
#include "librtmp/log.h"
#include "librtmp/rtmp.h"

void hello(void);

Makefile

SRC=src
BUILD=build
TARGET=$(BUILD)/app

all: $(BUILD) $(TARGET)

$(TARGET): $(SRC)/main.swift $(BUILD)/foo.o
	swiftc -import-objc-header $(SRC)/bridge.h -Iinclude -lrtmp -Llib -o $@ $^

$(BUILD):
	@mkdir -p $@

$(BUILD)/foo.o : $(SRC)/foo.c
	clang -c -o $@ $<

run: $(TARGET)
	@$(TARGET)

clean:
	@rm -rf $(BUILD)

.PHONY: clean run all

code: streamr.zip