使用 macOS 链接 SDL_image

Question

所以我正在尝试使用 SDL2 和 Codelite 创建一个简单的 2D 游戏引擎。 我已经编写了这段代码并使用 gcc 编译了它，使用g++ src/*.cpp -o game -I include -L lib -lSDL2 -lSDL2_image但它没有用。 我有一个包含SDL2和SDL_image的所有库的lib文件夹，以及一个include SDL 的所有 header 文件的包含文件夹。 我还尝试在 Codelite 中编译它，因此我重新创建了相同的文件结构并链接了 SDL。 在我尝试使用SDL_image之前，它工作得很好。 在Project settings -> Linker和Project settings -> Compiler选项卡中，我放置了与我在之前的项目中使用的包含文件和 lib 文件相同的路径，但它没有编译。 我收到此错误：

Undefined symbols for architecture arm64:
  "_TIFFClientOpen", referenced from:
      _IMG_LoadTIF_RW in libSDL2_image.a(IMG_tif.o)
  "_TIFFClose", referenced from:
      _IMG_LoadTIF_RW in libSDL2_image.a(IMG_tif.o)
  "_TIFFGetField", referenced from:
      _IMG_LoadTIF_RW in libSDL2_image.a(IMG_tif.o)
  "_TIFFReadRGBAImageOriented", referenced from:
      _IMG_LoadTIF_RW in libSDL2_image.a(IMG_tif.o)
  "_WebPDecodeRGBAInto", referenced from:
      _IMG_LoadWEBP_RW in libSDL2_image.a(IMG_webp.o)
  "_WebPDecodeRGBInto", referenced from:
      _IMG_LoadWEBP_RW in libSDL2_image.a(IMG_webp.o)
  "_WebPGetFeaturesInternal", referenced from:
      _IMG_LoadWEBP_RW in libSDL2_image.a(IMG_webp.o)
  "_jpeg_CreateCompress", referenced from:
      _IMG_SaveJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_CreateDecompress", referenced from:
      _IMG_LoadJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_calc_output_dimensions", referenced from:
      _IMG_LoadJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_destroy_compress", referenced from:
      _IMG_SaveJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_destroy_decompress", referenced from:
      _IMG_LoadJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_finish_compress", referenced from:
      _IMG_SaveJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_finish_decompress", referenced from:
      _IMG_LoadJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_read_header", referenced from:
      _IMG_LoadJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_read_scanlines", referenced from:
      _IMG_LoadJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_resync_to_restart", referenced from:
      _IMG_InitJPG in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_set_defaults", referenced from:
      _IMG_SaveJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_set_quality", referenced from:
      _IMG_SaveJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_start_compress", referenced from:
      _IMG_SaveJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_start_decompress", referenced from:
      _IMG_LoadJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_std_error", referenced from:
      _IMG_LoadJPG_RW in libSDL2_image.a(IMG_jpg.o)
      _IMG_SaveJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_jpeg_write_scanlines", referenced from:
      _IMG_SaveJPG_RW in libSDL2_image.a(IMG_jpg.o)
  "_png_create_info_struct", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
      _IMG_SavePNG_RW_libpng in libSDL2_image.a(IMG_png.o)
  "_png_create_read_struct", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_create_write_struct", referenced from:
      _IMG_SavePNG_RW_libpng in libSDL2_image.a(IMG_png.o)
  "_png_destroy_read_struct", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_destroy_write_struct", referenced from:
      _IMG_SavePNG_RW_libpng in libSDL2_image.a(IMG_png.o)
  "_png_get_IHDR", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_get_PLTE", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_get_channels", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_get_io_ptr", referenced from:
      _png_read_data in libSDL2_image.a(IMG_png.o)
      _png_write_data in libSDL2_image.a(IMG_png.o)
  "_png_get_tRNS", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_get_valid", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_read_image", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_read_info", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_read_update_info", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_set_IHDR", referenced from:
      _IMG_SavePNG_RW_libpng in libSDL2_image.a(IMG_png.o)
  "_png_set_PLTE", referenced from:
      _IMG_SavePNG_RW_libpng in libSDL2_image.a(IMG_png.o)
  "_png_set_expand", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_set_gray_to_rgb", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_set_interlace_handling", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_set_longjmp_fn", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
      _IMG_SavePNG_RW_libpng in libSDL2_image.a(IMG_png.o)
  "_png_set_packing", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_set_read_fn", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_set_rows", referenced from:
      _IMG_SavePNG_RW_libpng in libSDL2_image.a(IMG_png.o)
  "_png_set_strip_16", referenced from:
      _IMG_LoadPNG_RW in libSDL2_image.a(IMG_png.o)
  "_png_set_tRNS", referenced from:
      _IMG_SavePNG_RW_libpng in libSDL2_image.a(IMG_png.o)
  "_png_set_write_fn", referenced from:
      _IMG_SavePNG_RW_libpng in libSDL2_image.a(IMG_png.o)
  "_png_write_png", referenced from:
      _IMG_SavePNG_RW_libpng in libSDL2_image.a(IMG_png.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我真的不知道问题出在哪里，因为SDL链接正确。 我使用的是配备 M1 处理器、macOS Monterey 12.6 和 Codelite 16.6.9 的 MacBook Air，我认为这是最新版本。 我是用官方文档下载的。

Answer 1

我终于找到了在 macOS 上链接 SDL 的方法。 首先，您需要在此处下载 DMG 安装程序。 然后，您必须将刚刚下载的安装程序中的文件夹（名称必须以.framework结尾，例如SDL2.framework ）复制粘贴到/Library/Frameworks/中。 因此SDL框架（或任何与 SDL 相关的框架，例如SDL2_image ）的路径将是： /Library/Frameworks/SDL2.framework 。 然后，为了编译你的代码，你必须运行这个命令：

g++ main.cpp -F/Library/Frameworks -framework SDL2 -F/Library/Frameworks -framework SDL_image -I include -o mygame

此命令假定所有 SDL header 文件 ( SDL.h ) 都位于项目的根文件夹中名为include的文件夹中。 如果不是这样，您可以在/Library/Frameworks/SDL2.framework/Headers/SDL2中找到它们。