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Date:   Mon, 12 Nov 2018 09:53:05 -0800
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Joseph Myers <joseph@codesourcery.com>
Cc:     Willy Tarreau <w@1wt.eu>, Florian Weimer <fweimer@redhat.com>,
        "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
        Daniel Colascione <dancol@google.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Joel Fernandes <joelaf@google.com>,
        Linux API <linux-api@vger.kernel.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        Carlos O'Donell <carlos@redhat.com>,
        "libc-alpha@sourceware.org" <libc-alpha@sourceware.org>
Subject: Re: Official Linux system wrapper library?
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On Mon, Nov 12, 2018 at 05:36:11PM +0000, Joseph Myers wrote:
> What *is*, in my view, a bug in the uapi headers is that some of them 
> don't work when included on their own.  I'd expect #include 
> <linux/whatever.h> or #include <asm/whatever.h>, for any such header 
> installed by make headers_install, to compile on its own in userspace 
> without needing any other headers to be included first, unless some header 
> is specifically defined as being an internal part of another header which 
> is the one that should be included.

Yes, that is a bug, and people have been working on fixing that.  We now
have a new build target:
	make headers_check
to keep this all working properly.

Right now on Linus's latest tree I only see one failure when running
this:
	./usr/include/linux/v4l2-controls.h:1105: found __[us]{8,16,32,64} type without #include <linux/types.h>
so we are getting better.

If there are still problems with this, please let us know and we will be
glad to resolve them.

thanks,

greg k-h