Date: Tue, 3 Jan 2012 23:05:23 +0000 (UTC) From: Ed Schouten <ed@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r229437 - head/include Message-ID: <201201032305.q03N5NWH047347@svn.freebsd.org>
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Author: ed Date: Tue Jan 3 23:05:23 2012 New Revision: 229437 URL: http://svn.freebsd.org/changeset/base/229437 Log: Simply disallow <stdnoreturn.h> to be used in combination with C++. There is no way one could possibly use this header file in combination with C++ code. The problem is that in C11 the `noreturn' macro expands to the `_Noreturn' function specifier, while in C++11 the `noreturn' keyword is an attribute. So in C11 you have to write: noreturn void exit(int status); While in C++11 you have to write: [[noreturn]] void exit(int status); It is impossible to #define noreturn for C++ in such a way that it allows both conventions. By intentionally breaking this header this way, we prevent people from using this header in their C++<11 sources. Modified: head/include/stdnoreturn.h Modified: head/include/stdnoreturn.h ============================================================================== --- head/include/stdnoreturn.h Tue Jan 3 22:52:29 2012 (r229436) +++ head/include/stdnoreturn.h Tue Jan 3 23:05:23 2012 (r229437) @@ -26,11 +26,13 @@ * $FreeBSD$ */ +#ifdef __cplusplus +#error "<stdnoreturn.h> cannot be used in combination with C++11." +#endif + #ifndef noreturn -#if !defined(__cplusplus) || __cplusplus < 201103L #include <sys/cdefs.h> #define noreturn _Noreturn -#endif #endif /* !noreturn */
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