[CMake] Determine Verbosity in Custom Language Scripts

[David Zemon]

I've defined a custom language for my project which is simply a wrapper
around GCC. The "compiler" for this language is a CMake script which
invokes g++ followed by objcopy. I would like to use CMake's standard
verbosity system - either VERBOSE=1 for Unix Makefiles or -v or Ninja
(maybe there are others too?) but I don't know how. I was previously doing
something like

```
if (ENV{VERBOSE})
  message("g++ ${SOURCE}")
endif ()
execute_process(COMMAND g++ ${SOURCE})
```

but Ninja doesn't set an environment variable. Is it possible do this?

Thank you,
David Zemon
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