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Asked: 2026-05-11T03:02:27+00:00

I get this warning from GCC: warning: cannot pass objects of non-POD type ‘class

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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 3.8 Options to Request or Suppress Warnings, -Wno-invalid-offsetof, it looks like the flag to hide it, but it doesn’t.
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  1. I’m not sure what the correct warning is, but once you’ve found it, you can change its disposition with the following (using ‘format’ as the example):

    #pragma GCC diagnostic error "-Wformat"

    Or as strager points out:

    gcc -Werror=format ...

    I’ve checked the gcc source for this and this specific warning cannot be disabled via command line flags.

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