gcc/clang编译器选项中的-f和-m代表什么 [英] What do the -f and -m in gcc/clang compiler options stand for

问题描述

摘要:gcc和clang编译器选项中的-f和-m代表什么?

Summary: What do the -f and -m in gcc and clang compiler options stand for?

详细信息:

使用clang时，我注意到许多编译器选项均以-f开头，而另一些则以-m开头.我认为这是有历史原因的，我很好奇，因此我查看了gcc帮助并看到了以下内容:

When using clang I've noticed that many compiler options start with -f and others start with -m. I assume that there is some historical reason for this and I was curious so I looked at the gcc help and saw the following:

以-g，-f，-m，-O，-W或--param开头的选项是自动的 传递给gcc调用的各个子流程.为了 将其他选项传递给这些进程-W选项必须 被使用.

Options starting with -g, -f, -m, -O, -W, or --param are automatically passed on to the various sub-processes invoked by gcc. In order to pass other options on to these processes the -W options must be used.

如果我不得不猜测，我认为-f可能代表前端，而-m代表机器.但是我很想听到一个更全面的答案，可能包括gcc调用的其他子流程.

If I had to guess I think that -f might stand for frontend and -m for machine. But I'd be interested to hear a more comprehensive answer, possibly including the other sub-processes that gcc invokes.

推荐答案

我没有具体的资料说明'f'和'm'的含义，但是我们可以根据文档中的使用模式进行推断.

I don't have specific sources that state what 'f' and 'm' mean, but we can infer based on usage patterns found in documentation.

'f'代表标志".

如果通过'-fFLAG'指定，则打开标记，而通过'-fno-FLAG'

Flags are on if specified via '-fFLAG' and off via '-fno-FLAG'

例如:

  -fpic         # flag to set position independent code 
  -fno-builtin  # don't recognize build in functions ... 

技术定义是"f"定义控制代码生成中使用的接口约定".

The technical definition is that 'f' defines "Control the interface conventions used in code generation".

Src: https://gcc.gnu.org/onlinedocs/gcc/Code- Gen-Options.html (例如-fpci，当设置了 flag 时)

Src: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html (e.g -fpci, when this flag is set)

 -mabi=name   #abi mode = name
 -mcpu=cpu

Src: https://gcc.gnu.org/onlinedocs/gccint/Standard-Names. html (例如...当此模式 ...时)

Src: https://gcc.gnu.org/onlinedocs/gccint/Standard-Names.html (e.g ... when this mode...)

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