Disable specific warnings in GCC [duplicate]

Question

On Microsoft compilers, specific warnings can be disabled with a #pragma, without disabling other warnings. This is an extremely useful feature if the compiler warns over something that "has to be done".

Does GCC at this point have a similar feature? It seems like an obvious enough feature that it’s unimaginable that it wouldn't have this feature yet, but older information on the web suggests this feature doesn't exist.

What is one to use in GCC?

Specifically, I like to use multi-character constants, like 'abc'. These evaluate effectively as a base 256 number - a very handy feature, but it triggers a warning. It’s very handy for switching on four character strings in a case statement.

Answer 1

From the GCC manual:

Many options have long names starting with -f or with -W---for example, -fforce-mem, -fstrength-reduce, -Wformat and so on. Most of these have both positive and negative forms; the negative form of -ffoo would be -fno-foo. This manual documents only one of these two forms, whichever one is not the default.

But if you're asking whether there is a source-level warning disable, I'm not aware if that feature exists in GCC.