warn against K&R compiler in glibc 2.2

[Ulrich Drepper]

Andreas Jaeger <aj@suse.de> writes:

> The easiest way is AFAIK to add the following to some file:
> #ifndef __STDC__
> # error "You need a ISO C conforming compiler to use the glibc headers"
> #endif

If we are thinking about other compilers but gcc (which is legitimate
for the use of glibc) then this is not enough.  Most compilers beside
gcc do not define __STDC__ except if you direct the compiler to be
strictly compliant.  This is a weakness in the ISO C standard.

I don't know whether we can add any reasonable check.

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