Jeff King <> writes:

> Git code was my introduction to it, too, and I was led to believe it was
> idiomatic, so I can't speak further on that. I think it was Junio who
> introduced me to it, so maybe he can shed more light on the history.

I think we picked the convention up from the kernel folks.  At least
that is how I first met the construct.  The uninitialized_var(x)
macro was (and still is) used to mark these "The compiler is too
dumb to realize, but we know what we are doing" cases:

    $ git grep '#define uninitialized_var' include/
    include/linux/compiler-gcc.h:#define uninitialized_var(x) x = x
    include/linux/compiler-intel.h:#define uninitialized_var(x) x

but they recently had a discussion, e.g.

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