extern "C" not working with Linux icpc but works find with Mac

[Noel_B_]

Attached is simple reproducer that works on Mac with:

s1038899:~ kbelco$ icpc --version

icpc (ICC) 19.1.3 20200925

Copyright (C) 1985-2020 Intel Corporation.  All rights reserved.

but fails on Linux with Intel 19.1.4

The name mangling is different, you get the leading underscore on the Mac which is correct but on Linux you don't get the leading underscore.

I have to inline the source code since the attachment is rejected.

#include "junk.hpp"

int foo(char*) {

  return 0;

}

void foo2(char*) {

}

int main(int, char**) {

  return 0;

}

Here's the Mac output:

s1038899:~ kbelco$ nm a.out | grep -i foo

0000000100000c10 T _foo

0000000100000c20 T _foo2

Here's the Linux output:

-bash-4.2$ nm a.out | grep -i foo

0000000000400c40 T foo

0000000000400c50 T foo2

[Gopika_Intel · Accepted solution]

Hi,

Thank you for reaching out. We’ll check it and get back to you.

Regards

Gopika Ajit

[Viet_H_Intel]

On Linux, it needs to be compatible with Gnu. If icpc generated _foo symbol, then there would be an "undefined reference to foo" when you try to link mix objects (compile with icpc/g++).

Thanks,

[Viet_H_Intel]

Please let us know if you have any other questions. Otherwise, we would like to close this topic.

Thanks,

[Viet_H_Intel]

Let's close this ticket. If you require additional assistance from Intel, please start a new thread. Any further interaction in this thread will be considered community only.

Thanks,