I've a custom command in my CMake script which generates a lot of output. I'd like to take advantage of CMAKE_VERBOSE_MAKEFILE so I can decide if I want to see this output or not.
Is there a common way for doing this?
The one way I see is to redirect output to /dev/null depending on this CMake's flag, but what about Windows and other OSes?
Is there a portable or recommended way? What about default rules for C/C++ compiling commands?
Technically speaking, CMAKE_VERBOSE_MAKEFILE exists for the purpose of hiding and showing command lines, not command output.
If I had to do this, I would use a custom variable.
But on the main topic, here is how you should do:
if (COMMAND_VERBOSE)
execute_process(COMMAND "mycustom_command")
else (COMMAND_VERBOSE)
execute_process(COMMAND "mycustom_command" OUTPUT_QUIET)
endif (COMMAND_VERBOSE)
This is the most portable way to do so.
There is also an ERROR_QUIET flag, however it is a bad idea to disable error messages, else the user would be unable to see why the command failed if it failed.
If you are using add_custom_command or add_custom_target instead, such a flag does not exist. You'll have to provide a manual redirection to /dev/null (Unix), or NUL (Windows).
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