The C compiler identification is unknown when compile C++ in Mac Mojave - c++

Question

I am compiling a simple c++ file in Mac OS Majave:
/Applications/CLion.app/Contents/bin/cmake/mac/bin/cmake .
current folder contains a file:
#include <iostream>
int main() {
std::cout << "Hello, World!" << std::endl;
return 0;
}
This is the CMakeList.txt:
cmake_minimum_required(VERSION 3.14)
project(untitled)
set(CMAKE_CXX_STANDARD 14)
add_executable(untitled main.cpp)
And the error output is:
dolphins-MacBook-Air:untitled dolphin$ /Applications/CLion.app/Contents/bin/cmake/mac/bin/cmake .
-- The C compiler identification is unknown
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:2 (project):
The CMAKE_C_COMPILER:
/Users/dolphin/Desktop/Xcode.app/Contents/Developer/usr/bin/gcc
is not a full path to an existing compiler tool.
Tell CMake where to find the compiler by setting either the environment
variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
the compiler, or to the compiler name if it is in the PATH.
The cc environment variable is:
dolphins-MacBook-Air:untitled dolphin$ env |grep gcc
CC=/Users/dolphin/Desktop/Xcode.app/Contents/Developer/usr/bin/gcc
Where is going wrong?

Answer 1

You need to set the path for CXX also. Like below:
export CC=/path/to/gcc
export CXX=/path/to/g++
# Then cmake will find the compilers
Under linux, my compilers are stored here:
/usr/bin/gcc
/usr/bin/g++
You can use which gcc and which g++ to find the paths of the compilers, provided they can be found in your path.