我可以在一个c++项目中混合c和cpp文件吗?

I'm still a beginner and I'm working with eclipse.

我仍然是一个初学者，我正在使用eclipse。

I have a project that had c files and cpp files mixed in it. The linker throws errors at me:

我有一个项目，其中包含c文件和cpp文件。链接者向我抛出错误:

undefined reference to <all my functions in the c files>

After I rename all *.c files to *.cpp the errors vanish. So can't I mix those files or is this some compiler/linker options problem?

在我重命名所有*之后。c文件*。cpp消失的错误。我不能把这些文件混在一起，或者这是编译器/链接器选项的问题?

My options:

我的选择:

GCC C++ Compiler:

GCC c++编译器:

-I/usr/include/glib-2.0 -I/usr/include/gtk-2.0 -I"/myPath" -O0 -g3   \
    -Wall -c -fmessage-length=0 `pkg-config --cflags glib-2.0 gtk+-2.0

GCC C Compiler:

GCC C编译器:

-I/usr/include/glib-2.0 -I/usr/include/gtk-2.0 -I"/myPath" -O0 -g3   \
    -Wall -c -fmessage-length=0 -std=c99 `pkg-config --cflags glib-2.0 gtk+-2.0`

GCC C++ Linker:

GCC c++链接:

-L/usr/include/glib-2.0/glib `pkg-config --libs gtk+-2.0`

OK, since it says C++ Linker, does that mean object files from c files cannot be linked into the project (by default)?

好的，既然它说的是c++链接器，这是否意味着来自C文件的对象文件不能链接到项目中(默认情况下)?

2 个解决方案

#1

extern "C" is one approach. The other approach, assuming your C files are of the (almost ubiquitous) sort which are already compilable as C++, is simply to coerce the compiler into treating them as C++ (which gives them the appropriate name mangling to work with your C++ files). For GCC, this is -x c++.

走读是一种方法。另一种方法，假设您的C文件属于(几乎无处不在的)类型，并且已经可以编译为c++，那么只需强制编译器将它们视为c++(这给了它们适当的名称管理，以处理您的c++文件)。对于GCC，这是-x c++。

#2

You need to wrap the C code like so

您需要像这样封装C代码

extern "C" {
    #include "sample1.h"
}

A better way to do it is like in this * question, in the C header files.

更好的方法是在这个*问题中，在C头文件中。

use:

使用:

#ifdef __cplusplus
extern "C" {
#endif

At the start of all C header files.

在所有C头文件的开头。

and use:

和使用:

#ifdef __cplusplus
}
#endif

At the end of all C header files.

在所有C头文件的末尾。

#1

#2