Make one gcc warning an error

gccgcc-warning

I get this warning from GCC:

warning: cannot pass objects of non-POD type 'class Something' through '…'; call will abort at runtime

It's pretty deadly, especially since it calls an abort. Why isn't this an error? I would like to make it an error, but:

  1. How do I make a specific warning an error?
  2. Which warning is it? According to http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html, -Wno-invalid-offsetof looks like the flag to hide it, but it doesn't

Best Answer

I'm not sure what the correct warning is, but once you've found it, you can change it's disposition with the following (using 'format' as the example):

#pragma GCC diagnostic error "-Wformat"

Or as strager points out:

gcc -Werror=format ...

Edit: I've just checked the gcc source for this and this specific warning cannot be disabled via command line flags.

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