c - 链接 c 项目时体系结构 x86_64 的 undefined symbol

Question

我尝试编译 picoc项目到xcode。没有外部库，只有我在命令行工具 C 项目中导入的 .c 和 .h 文件。

所有 .c 文件编译都没有问题，但是当 XCode 链接时，我收到这些消息:

    Undefined symbols for architecture x86_64:
  "_BasicIOInit", referenced from:
      _PicocInitialise in platform.o
  "_CStdOut", referenced from:
      _PrintSourceTextErrorLine in platform.o
      _PlatformVPrintf in platform.o
  "_MathFunctions", referenced from:
      _IncludeInit in include.o
  "_MathSetupFunc", referenced from:
      _IncludeInit in include.o
  "_PicocPlatformScanFile", referenced from:
      _IncludeFile in include.o
  ...

报错的命令如下:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk -L/Users/laurent/Library/Developer/Xcode/DerivedData/Pico-dhfwbamkhiyphjcwuncbwjsyjlax/Build/Products/Debug -F/Users/laurent/Library/Developer/Xcode/DerivedData/Pico-dhfwbamkhiyphjcwuncbwjsyjlax/Build/Products/Debug -filelist /Users/laurent/Library/Developer/Xcode/DerivedData/Pico-dhfwbamkhiyphjcwuncbwjsyjlax/Build/Intermediates/Pico.build/Debug/Pico.build/Objects-normal/x86_64/Pico.LinkFileList -mmacosx-version-min=10.8 -o /Users/laurent/Library/Developer/Xcode/DerivedData/Pico-dhfwbamkhiyphjcwuncbwjsyjlax/Build/Products/Debug/Pico

Pico.LinkFileList 文件正确包含所有必需的 .o 文件的列表。

由于所有未找到的函数都在正确编译的 .c 文件中(并编译为 .o)，我应该怎么做才能避免这些错误？谢谢。

Answer 1

这些符号在 clibrary.c 中；您一定是从要编译的源文件列表中遗漏了它。

你的下一个问题无疑是关于链接可执行文件的库，为了解决这个问题，我建议你查看 Makefile。