Consistency of function attributes between prototype and definition

[Florian Weimer]

glibc has a preprocessor macro called internal_function which switches
to a different calling convention on certain targets (i386 uses stdcall
and regparams).  For non-K&R function definitions, the compiler enforces
that both the prototype declaration and the definition match.

When someone writes a patch on a different architecture than i386 and
forgets to specify internal_function on both prototype and definition,
the build will pass, even though i386 will not compile.

Is there a way to use a certain harmless attribute to detect this
mismatch even on architectures where internal_function has no effect?