Seeming flaw in Xcode 10

[Perry E. Metzger]

On Sun, 11 Nov 2018 17:50:10 -0500 Mark Anderson <emer at emer.net>
wrote:
> First thing I would do is file a radar. I know that's a terrible
> solution, but it'll be the thing anyone at apple will tell us to do
> first thing.

I may be mistaken about the problem (see my response to Ken a few
moments ago.) This is what I get for trying to think things through
while I have a bad headache.

Perry

> —Mark
> _______________________
> Mark E. Anderson <emer at emer.net>
> 
> 
> On Sun, Nov 11, 2018 at 5:36 PM Perry E. Metzger
> <perry at piermont.com> wrote:
> 
> > As some of you are aware, XCode 10 no longer searches SDK include
> > directories for C headers specified with " marks, as in
> >
> > #include "stdio.h"
> >
> > I happened to be reading the C standard (don't ask why) and I've
> > discovered this new behavior is wrong and the original behavior
> > was correct. To wit, in C11, 6.10.2 Source file inclusion,
> > paragraph 3:
> >
> >    A preprocessing directive of the form
> >    # include "q-char-sequence" new-line
> >    causes the replacement of that directive by the entire
> > contents of the source file identified by the specified sequence
> > between the " delimiters. The named source file is searched for
> > in an implementation-defined manner. If this search is not
> > supported, or if the search fails, the directive is reprocessed
> > as if it read # include <h-char-sequence> new-line
> >    with the identical contained sequence (including > characters,
> > if any) from the original directive.
> >
> > In other words, if you say "stdio.h", and that file isn't found
> > in the search path for "-quoted include file names, the compiler
> > is to search as though it had been written with a <name.h>
> > include.
> >
> > I know some of our group are Apple employees. Does anyone know
> > how to get in touch with the Xcode team to inform them that this
> > change of behavior is apparently nonstandard, and breaks the
> > expectations of standards conforming C code?
> >
> > Perry
> > --
> > Perry E. Metzger                perry at piermont.com
> >  



-- 
Perry E. Metzger		perry at piermont.com