/usr/bin/locale: source file is not valid UTF-8

Question

using g++ to compile cpp file in macOS.

macOS v10.15.4

Apple clang version 11.0.3 (clang-1103.0.32.62)

hello.cpp

#include <iostream>
using namespace std;

int main()
{
  cout << "hello word" << endl;
  return 0;
}

in terminal I run:

g++ hello.cpp

Answer 1

CPLUS_INCLUDE_PATH environment variable has an incorrect value.

Simple fix:

export CPLUS_INCLUDE_PATH=":/usr/local/include"