lint kills _Noreturn

[Hans-Bernhard Bröker]

Am 30.05.2016 um 10:44 schrieb Corinna Vinschen:

> Our cdefs.h is taken almost verbatim from FreeBSD, and FreeBSD's
> cdefs.h uses the exact same expressions chcking for lint.

That means almost nothing.  The BSD guy might have a good, 
platform-specific reason to assign a specific meaning to the macro 
"lint" that's buried in their history, and doesn't even apply to Cygwin. 
  And of course like everybody else, they could simply have got it wrong.

 > Don't set lint.

It's not that simple.

On the one hand the global name "lint" is clearly in the user's name 
space.  If an implementation wants to use a macro that means something 
special, and which user code is not supposed to meddle with, that's what 
the language has reserved name space patterns for (it should then be 
__lint or __LINT).

OTOH the original lint, although it's a tool that's used to check for 
violations of such rules among others, unfortunately used to violate 
those same rules by predefining a global macro "lint", and existing code 
still relies on that property to hide non-standard constructs like that 
_Noreturn from lint.

Disappointingly the more modern implementations of lint still get this 
wrong, or at least not quite right, in different ways:  splint documents 
"S_SPLINT_S", which at least looks like a macro, but is still in user 
namespace.  Gimpel's ones have "_lint", which is better than "lint", but 
should really be "__lint".


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