[CMake] How to specify Redhat Developer Toolset compiler?

[David Aldrich]

My Centos 7.6 machine has CMake 3.13.5 and g++ 4.8.5 installed:

$ /usr/bin/x86_64-redhat-linux-g++ --version
x86_64-redhat-linux-g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-36)

I have a very simple CMakeLists.txt:

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
project(hello_world LANGUAGES CXX)

add_executable(hello_world "")

target_sources(hello_world
  PRIVATE
    main.cpp
    Message.hpp
    Message.cpp)

I also have Redhat Developer Toolset 7 installed which I can enable in my
bash shell:

$ scl enable devtoolset-7 bash
$ which g++
/opt/rh/devtoolset-7/root/usr/bin/g++
$ g++ --version
g++ (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)

How can I get CMake to use the later version of g++ instead of 4.8.5?
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