GCC Steering Committee decision on ISO C conversion

[Bonzini]

> From time to time non-ISO C89 code but valid ISO C99 (and C++)
> code creeps into the compiler: specifically declarations of
> variables after the first statement in a block:

Is it possible to add a warning for this, or to add a new language dialect
`gnu89' that allows GNU extensions that predate C99, but not C99-isms like
this that are bound to fail on C89 compilers?

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