From: David Laight <David.Laight@ACULAB.COM>
To: 'Kees Cook' <keescook@chromium.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"'linux@rasmusvillemoes.dk'" <linux@rasmusvillemoes.dk>,
'Steven Rostedt' <rostedt@goodmis.org>,
"'bvanassche@acm.org'" <bvanassche@acm.org>,
"torvalds@linux-foundation.org" <torvalds@linux-foundation.org>,
"Nathan Chancellor" <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Arnd Bergmann <arnd@arndb.de>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>
Subject: RE: [PATCH v2 next] compiler.h: Move __is_constexpr() to compiler.h.
Date: Fri, 6 Oct 2023 15:51:06 +0000 [thread overview]
Message-ID: <321c3c0984e64e9cbd1b034755611710@AcuMS.aculab.com> (raw)
In-Reply-To: <202310050921.F0B15702D4@keescook>
It can also be defined more portably as:
#define __is_constexpr(x) \
_Generic(0 ? (void *)((long)(x) * 0) : (int *)0, int *: 1, void *: 0)
Which doesn't rely on 'sizeof (void)' being valid.
But that is for another day.
There is also:
#define is_pointer_type(type) __is_constexpr((type)1)
David
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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
prev parent reply other threads:[~2023-10-06 15:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-05 11:39 [PATCH v2 next] compiler.h: Move __is_constexpr() to compiler.h David Laight
2023-10-05 16:21 ` Kees Cook
2023-10-06 8:28 ` David Laight
2023-10-06 15:51 ` David Laight [this message]
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