有没有办法忽略C预处理器输出顶部的定义(行标记)? [英] Is there a way to omit the definitions (line markers) at the top of the C-preprocessor output?

问题描述

如果我使用gcc -C -x c -E test.def处理以下test.def输入文件:

If I process the following test.def input file with gcc -C -x c -E test.def:

#define TEST foo 
int TEST;

我希望输出为:

int foo;

相反，我得到了:

# 1 "test.def"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "test.def"

int foo;

有什么办法可以省略顶部的多余行?

Is there a way I can omit those extra lines at the top?

推荐答案

这些不仅位于顶部-而是C预处理程序用来传达某些行来自何处​​的源代码位置的行标记，到C编译器.

These are not just on the top - but instead they're the line markers that the C preprocessors use to convey the source code positions where certain lines come from, to the C compiler.

有了GCC，这很容易，因为 GCC支持-P开关，和 llvm Clang也是如此:

With GCC this is easy, as GCC supports the -P switch, and so does llvm Clang:

-P.禁止在 预处理器.当在不是C代码的东西上运行预处理器时，这可能会很有用，并且会将其发送到可能会被行标记混淆的程序.

-P. Inhibit generation of linemarkers in the output from the preprocessor. This might be useful when running the preprocessor on something that is not C code, and will be sent to a program which might be confused by the linemarkers.

因此，请使用gcc -E -P -x c.

此外，我不使用-C(保留注释)，因为gcc似乎从隐式头文件中添加了一些注释.

Also, I'd not use -C (retain comments), as it seems that with it gcc adds some comments from implicit header files.

这篇关于有没有办法忽略C预处理器输出顶部的定义(行标记)?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！