将#includes扩展为C ++的文本文件 [英] Expand #includes to a text file for C++

问题描述

是否可以使用 C 预处理程序扩展c ++文件的 #include 行，以便我可以在没有#的情况下读取扩展文件包含，但包含 #include d?

Is it possible to expand out #include lines of a c++ file, probably using the C preprocessor, such that I can read an extended file without #includes, but instead with the files that are #included?

具体来说，如果我有

fileA.cpp:

fileA.cpp:

#include "fileB.H"

int main()
{
//do whatever
return(0);
}

fileB.H:

#include "fileC.H"
//Some lines of code

fileC.H

//Some other lines of code

并输出:

//Some other lines of code
//Some lines of code

int main()
{
//do whatever
return(0);
}

本质上，无需复制即可将粘贴的文件复制粘贴到一个大的text/C ++代码文件中?

Essentially, copy-pasting the files that are included into one large text/C++ code file, without compiling?

如果我使用相关的 -I<包含要包含的文件的目录运行cpp，那么我会得到一个长文本文件，而不仅仅是代码，它给出了将传递给编译器的内容(h！)

If I run the cpp with relevant -I<Directory containing files to include> then I get a long text file, but rather than just code, it gives what would be passed to the compiler (duh!)

推荐答案

对于gcc和clang，您可以使用-E选项(看到类似的答案)，无需编译即可输出预处理器输出.

For gcc and clang, you can use the -E option (see similar answer) to output the preprocessor output without compiling.

要在示例输出中也显示注释，可以添加-CC和-P标志:

To also show comments like in your sample output, you can add in the -CC and -P flags:

clang ++ -E -CC -P fileA.cpp

-E的所有处理器选项都可以可以在gcc.gnu.org上找到.

-CC 请勿丢弃注释，包括在宏扩展过程中.就像-C一样，除了宏中包含的注释也被传递到扩展宏的输出文件.

-CC Do not discard comments, including during macro expansion. This is like -C, except that comments contained within macros are also passed through to the output file where the macro is expanded.

-P 禁止在预处理器的输出中生成线标记.在运行预处理器时，这可能会很有用不是C代码的东西，将被发送到程序可能会被线标记弄糊涂了.

-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.

对于Visual C ++编译器，可以使用/E.请参阅此SO答案.

For the Visual C++ compiler, you can use /E. See this SO answer.

这篇关于将#includes扩展为C ++的文本文件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！