Date: Tue, 21 Apr 2015 08:42:41 +0100 From: David Chisnall <theraven@FreeBSD.org> To: Bruce Evans <brde@optusnet.com.au> Cc: John Baldwin <jhb@freebsd.org>, Justin Hibbits <jhibbits@freebsd.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r281721 - head/sys/sys Message-ID: <785A553E-317E-4C80-83A0-567C80697ED8@FreeBSD.org> In-Reply-To: <20150421020808.D10623@besplex.bde.org> References: <201504190033.t3J0XMDX041769@svn.freebsd.org> <476583045.Qcb6O2DFtY@ralph.baldwin.cx> <20150421020808.D10623@besplex.bde.org>
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On 20 Apr 2015, at 17:19, Bruce Evans <brde@optusnet.com.au> wrote: >=20 > Enums should never be used in ABIs, since their size can be anything > large enough. The rules for the size of enums also differ between C and C++, though = clang (and, I think, gcc) support an attribute for specifying the enum = type. > They also cause namespace problems. The whole enum declaration must > be exposed in any header that uses an enum type. Both C and C++ permit forward declarations of enums for use in function = prototypes and so on, e.g.: enum foo; void bar(enum foo); David
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