C++ file including C header file [duplicate]

Question

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!

yes, but why did you put it there? You don't put a comma after the last thing in an enum, do you? — genisage
– genisage, Commented Jun 8, 2014 at 3:14
@genisage The comma-after-last-item is actually allowed for enum declarations. — T.C.
– T.C., Commented Jun 8, 2014 at 3:16

T.C. · Accepted Answer · 2014-06-08 03:20:25Z

0

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

answered Jun 8, 2014 at 3:20

T.C.

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2 Comments

fdeslaur Over a year ago

Forcing to C++11 doesn't seems right in my case, for portability issues.

T.C. Over a year ago

@fdeslaur ...then don't use a C++11 feature.

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