On Sun, Feb 25, 2018 at 6:52 AM, Dimitry Andric <d...@freebsd.org> wrote:
> On 24 Feb 2018, at 17:01, Alan Somers <asom...@freebsd.org> wrote: > > > > Author: asomers > > Date: Sat Feb 24 16:01:21 2018 > > New Revision: 329910 > > URL: https://svnweb.freebsd.org/changeset/base/329910 > > > > Log: > > Implement CTASSERT using _Static_assert > > > > Prevents warnings about "unused typedef" with GCC-6 > > > > Reported by: GCC-6 > > MFC after: 18 days > > X-MFC-With: 329722 > > > > Modified: > > head/sys/cddl/contrib/opensolaris/uts/common/sys/debug.h > > > > Modified: head/sys/cddl/contrib/opensolaris/uts/common/sys/debug.h > > ============================================================ > ================== > > --- head/sys/cddl/contrib/opensolaris/uts/common/sys/debug.h Sat Feb > 24 15:13:20 2018 (r329909) > > +++ head/sys/cddl/contrib/opensolaris/uts/common/sys/debug.h Sat Feb > 24 16:01:21 2018 (r329910) > > @@ -133,8 +133,8 @@ _NOTE(CONSTCOND) } while (0) > > #ifndef CTASSERT > > #define CTASSERT(x) _CTASSERT(x, __LINE__) > > #define _CTASSERT(x, y) __CTASSERT(x, y) > > -#define __CTASSERT(x, y) \ > > - typedef char __compile_time_assertion__ ## y [(x) ? 1 : -1] > > +#define __CTASSERT(x, y) \ > > + _Static_assert((x), "Static assert failed at " #y) > > #endif > > > > #ifdef _KERNEL > > Note that the trick with the negatively indexed array is to support > older versions of gcc, which did not yet recognize _Static_assert. It > looks like this was added in gcc 4.6. > > -Dimitry > > sys/cdefs.h defines _Static_assert similarly on GCC 4.3-4.5, and defines it to nothingness on GCC-4.2. So we should be covered for all compilers that we care about. -Alan _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
