C++ file including C header file [duplicate]

问题

This question already has answers here:

error: 'INT32_MAX' was not declared in this scope (7 answers)

Closed 5 years ago.

I need to include a C header file in my C++ project but g++ throws "not declared in this scope" errors. I read that i need to use extern "C" keyword to fix it but it didn't seem to work for me.

Here is a dummy example triggering this error.

main.cpp:

#include <iostream>
extern "C"
{
#include "includedFile.h"
}
int main()
{
    int a = 2;
    int b = 1212;
    std::cout<< "Hello World!\n";

    return 0;
}

includedFile.h

#include <stdint.h>
enum TypeOfEnum {
    ONE,
    TWO,
    THREE,
    FOUR = INT32_MAX,
};

The error thrown is :

$> g++ main.cpp 
In file included from main.cpp:4:0:
includedFile.h:7:9: error: ‘INT32_MAX’ was not declared in this scope
FOUR = INT32_MAX,

I saw on this post that I may need #define __STDC_LIMIT_MACROS without any success.

Any help is welcome!

回答1:

<cstdint> is a C++11 feature. Pass -std=c++11 to your compiler.

来源：https://stackoverflow.com/questions/24102616/c-file-including-c-header-file