Does C have a standard ABI?

Question

From a discussion somewhere else:

C++ has no standard ABI

But neither does C, right?

On any given platform it pretty much does. It wouldn\'

Answer 1

neither does C, right?
Right

On any given platform it pretty much does. It wouldn't be useful as the lingua franca for inter-language communication if it lacked one.
Pretty much might refer to architecture-specific defaults chosen by C compiler vendors being adapted within other languages. So if Keil's ARM C compiler will use left to right little endian parameter ordering and stack to pass arguments and some predetermined register for return value, then extern "C" from other compilers will assume compatibility with such scheme.

While such agreement maybe considered part of ABI, unlike managed execution context such as JVM browser sandbox, this is far from being complete standard ABI by itself.