How to silence unused command line argument error with clang without disabling it?

Question

When using -Werror with clang, it transforms "warning: argument unused during compilation" messages into errors, which makes sense. There's a -Qunused-arguments flag to silence them entirely. My question is, is there some -Wno-error=... flag I can pass to make these not be errors, without disabling them entirely?

Answer 1

Turns out the correct answer is -Wno-error=unused-command-line-argument.

Answer 2

You can also use this command:

-Wno-unused-command-line-argument

Answer 3

In my case, I had similar issues with autoconf while using clang-8 compiler in ./configure.

*clang-8: error: unknown argument: '-ftree-loop-distribute-patterns'*
*clang-8: error: unknown argument: '-fno-semantic-interposition'*

I needed following command line to fix these errors:

./configure CC=clang-8 CXX=clang++-8 LD=clang++-8 CFLAGS=-Qunused-arguments

Hope this is helpful to others.