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Simply disallow <stdnoreturn.h> to be used in combination with C++.

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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.
This commit is contained in:
Ed Schouten 2012-01-03 23:05:23 +00:00
parent ba804f54f9
commit 112f210647
1 changed files with 7 additions and 5 deletions
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12
include/stdnoreturn.h
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@ -26,11 +26,13 @@
* $FreeBSD$
*/
#ifndef noreturn
#if !defined(__cplusplus) || __cplusplus < 201103L
#include <sys/cdefs.h>
#define noreturn _Noreturn
#ifdef __cplusplus
#error "<stdnoreturn.h> cannot be used in combination with C++11."
#endif
#ifndef noreturn
#include <sys/cdefs.h>
#define noreturn _Noreturn
#endif /* !noreturn */