强制 gcc 将 .cpp 文件编译为 C
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Forcing gcc to compile .cpp file as C
提问by ralight
I have an externally provided .cpp file. It is a mixture of C compatible code and a bit of C++ as well. The C++ code is just a wrapper around the C to take advantage of C++ features.
我有一个外部提供的 .cpp 文件。它是 C 兼容代码和一些 C++ 的混合体。C++ 代码只是 C 的包装器，以利用 C++ 的特性。
It uses #ifdef __cplusplusmacros to protect the C++ code, which is great. Unfortunately, if I try to compile using gcc, it treats it as C++ because of the file ending. I'm aware of the differences between gcc and g++ - I don't want to compile as C++.
它使用#ifdef __cplusplus宏来保护 C++ 代码，这很棒。不幸的是，如果我尝试使用 gcc 进行编译，由于文件结尾，它会将其视为 C++。我知道 gcc 和 g++ 之间的区别 - 我不想编译为 C++。
Is there any way I can force gcc to treat this file as a C file? I've tried using e.g. --std=c99, but this correctly produces the error that C99 isn't valid for C++.
有什么办法可以强制 gcc 将此文件视为 C 文件？我试过使用 eg --std=c99，但这正确地产生了 C99 对 C++ 无效的错误。
Renaming the file to .c works, but I'd like to avoid this if possible because it's externally provided and it'd be nice for it to remain as a pristine copy.
将文件重命名为 .c 是可行的，但如果可能的话，我想避免这种情况，因为它是外部提供的，并且最好将其保留为原始副本。
Thanks!
谢谢！
回答by Michael Mrozek
The -xoption to gcc lets you specify the language of all input files following it:
-xgcc的选项允许您指定其后的所有输入文件的语言：
$ gcc -x c your-file-name.cpp
If you only want to special-case that one file, you can use -x noneto shut off the special treatment:
如果您只想对那个文件-x none进行特殊处理，您可以使用来关闭特殊处理：
$ gcc -x c your-filename.cpp -x none other-file-name.cpp
(your-filename.cppwill be compiled as C, while other-file-name.cppwill use the extension and compile as C++)
（your-filename.cpp将被编译为 C，而other-file-name.cpp将使用扩展并编译为 C++）
回答by Rob Kennedy
To compile foo.cppas a C file, you can create a new file named foo.cand put the following as its entire contents:
要将foo.cpp编译为 C 文件，您可以创建一个名为foo.c的新文件，并将以下内容作为其全部内容：
#include "foo.cpp"
Now compile foo.cinstead of foo.cpp.
现在编译foo.c而不是foo.cpp。
We've used this to go the other way (compile a .cfile as C++) in order to start using C++ features in some files while preserving their decade-long CVS history. Also, we build using each platform's native compiler, not just GCC, so we didn't have to find the -xequivalent command for a half-dozen compilers, and then make our build system apply that command only to certain files.
我们已经用它来走另一条路（将.c文件编译为 C++），以便在某些文件中开始使用 C++ 功能，同时保留其长达十年的 CVS 历史。此外，我们使用每个平台的本机编译器进行构建，而不仅仅是 GCC，因此我们不必-x为六个编译器找到等效的命令，然后让我们的构建系统仅将该命令应用于某些文件。
