• test.m文件

  #import <Foundation/Foundation.h>
  #import "TestExample.h"
  
  int main(){
      NSLog(@"testApp----");
      TestExample *manager = [TestExample new];
      [manager lg_test: nil];
      return 0;
  }

• TestExample.h

  #import <Foundation/Foundation.h>
  
  @interface TestExample : NSObject
  
  - (void)lg_test:(_Nullable id)e;
  
  @end

• TestExample.m

  #import "TestExample.h"
  
  @implementation TestExample
  
  - (void)lg_test:(_Nullable id)e {
      NSLog(@"TestExample----");
  }
  @end

• 脚本

  echo "编译test.m --- test.o"
  clang -target x86_64-apple-macos12.1 \
  -fobjc-arc \
  -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk \
  -I./dylib \
  -c test.m -o test.o
  
  pushd ./dylib
  
  echo "编译TestExample.m --- TestExample.o"
  clang -target x86_64-apple-macos12.1 \
  -fobjc-arc \
  -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk \
  -c TestExample.m -o TestExample.o
  
  echo "编译TestExample.o --- libTestExample.a"
  
  # 新增 >>>>>>>>>>>
  
  # Xcode (默认使用的就是 libtool 来编译静态库) -> 静态库
  libtool -static -arch_only x86_64 TestExample.o -o libTestExample.a
  
  echo "编译TestExample.m --- libTestExample.dylib"
  ld -dylib -arch x86_64 \
  -macosx_version_min 12.1 \
  -syslibroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk \
  -lsystem -framework Foundation \ # -lsystem: 需要系统库支撑: dylib dyld，-framework Foundation: 链接Foundation 这个动态库
  libTestExample.a -o libTestExample.dylib
  
  # 新增 <<<<<<<<<<<
  popd
  
  echo "链接libTestExample.dylib -- test EXEC"
  
  clang -target x86_64-apple-macos12.1 \
  -fobjc-arc \
  -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk \
  -L./dylib \
  -lTestExample \
  test.o -o test

  目录结构:

  ├── build.sh
  ├── dylib
  │   ├── TestExample.h
  │   └── TestExample.m
  └── test.m

需要给脚本添加执行的权限 chmod +x 脚本的路径

静态库通过探索得知，其是目标文件的集合，而动态库和可执行文件一样，是链接后的产物，所以才能将一个静态库链接成动态库

示例中脚本处 libTestExample.a -o libTestExample.dylib，因此直接将 .o链接成动态库同样是没问题的