@Override
	public String getRuntimeToolName() {
		return null;
	}
For my own information on I'm recording what I needed to do to get a unit test to compile and run in C++ on the Mac.
I got a segmentation violation and couldn't figure out how to get information about it, so I turned on debugging
and then figured out lldb enough to create this issue: https://github.com/antlr/antlr4/issues/3845 on a bug.

cd ~/antlr/code/antlr4/runtime/Cpp
cmake . -D CMAKE_OSX_ARCHITECTURES="arm64; x86_64" -DCMAKE_BUILD_TYPE=Debug
make -j 8

In test dir with generated test code:

clang++ -g -std=c++17 -I /Users/parrt/antlr/code/antlr4/runtime/Cpp/runtime/src -L. -lantlr4-runtime *.cpp
./a.out input

$ lldb ./a.out input
(lldb) run
... crash ...
(lldb) thread backtrace
runtime-testsuite/test/org/antlr/v4/test/runtime/cpp/CppRunner.java