xcode/clang: clang: warning: argument unused during compilation: '-fcheck-new'

Question

As title:

I'm constantly getting this warning that flooded out my screen in Xcode4 for the -fcheck-new options that I use.

clang: warning: argument unused during compilation: '-fcheck-new'

Is it that clang does not support this gcc compiler option??? How can I get rid of the warnings?

Thanks!

Solution

This warning can be silenced by adding the flag -Qunused-arguments

It's a warning because clang does not support the -fcheck-new argument.

Comments

[Carl Norum]

You could also remove the bad flag.

[Arto Bendiken]

For those of you who got these warnings when using Clang in conjunction with ccache, find more particulars here: petereisentraut.blogspot.com/2011/05/ccache-and-clang.html

[Kurt Schwehr]

For callbacks, it may not be possible to remove the unused flag. Is there an equivalent to gcc's attribute((__unused)) ?

[Julian]

@CarlNorum not always you can remove the flag example

[cxw]

@ArtoBendiken Thanks very much - your link was just what I needed. For those running Cygwin x64, as of writing, the packaged ccache does not include the bugfix. Therefore, you have to build ccache from source to get rid of the warnings.