Date: Sat, 20 Oct 2012 19:38:53 -0400 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Re: [PATCH 2/4] Add basic sys/cdefs.h found on most unix On Sun, Oct 21, 2012 at 01:38:52AM +0200, Abdoulaye Walsimou GAYE wrote: > On 10/21/2012 01:18 AM, Isaac Dunham wrote: > >On Sat, 20 Oct 2012 22:15:43 +0200 > >Abdoulaye Walsimou Gaye <awg@...toolkit.org> wrote: > > > >>Signed-off-by: Abdoulaye Walsimou Gaye <awg@...toolkit.org> > >>--- > >> include/sys/cdefs.h | 22 ++++++++++++++++++++++ > >> 1 file changed, 22 insertions(+) > >> create mode 100644 include/sys/cdefs.h > >I'm pretty sure that the last three times sys/cdefs.h was proposed, > >it was rejected. > > Unfortunately many packages (wrongly?) use to rely on macros defined there, I've found it's really very few; an equivalent sys/cdefs.h does not exist on most systems. It was never intended for use by applications; it's an internal part of glibc (and perhaps also some BSDs?) used for handling backwardsness like pre-ANSI C compilers (abstracting const away as __const, or abstracting away prototypes with __P()) and optional use of GCC-specific features. For things like 'extern "C"', there's no reason to use sys/cdefs.h; the just writing the code it expands to inline is much more clear/informative and provides better performance as a nice side effect. > sometimes indirectly via <features.h>. I don't see what you mean by this. Rich
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