Macro that expands to value or empty, based on boolean argument

I’m generating some compile-time code. I need to append a suffix to a generated function name, based on a macro boolean. The suffix is either present or empty. How to do that?

#define FUNC_NAME(name, hasSuffix) name ## MAYBE_SHOW_SUFFIX(hasSuffix)

FUNC_NAME(foo, true);  // would generate: foo_
FUNC_NAME(foo, false); // would generate: foo

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