Re: [PATCH] inttostr.h: add compile-time buffer overrun checks

[Bruno Haible]

Paul Eggert wrote:
>  * The calling code (though not gnulib) must assume support for
>    C99 compound literals.

If we go this route, then I'd be in favour of letting gnulib-tool check
that, by default, it does not include code that assumes C99. This means:
  - Modules should have an optional attribute "requires-c99",
  - gnulib-tool should, by default, give an error when such a module is used.
  - gnulib-tool should have an option --assume-c99 that silences this error.
  - gnulib-tool should have options --with/--without-c99-tests that allows
    control over whether to include unit tests that require C99 (needed
    because 'hash-tests' will require C99 but 'hash' won't).

Bruno