[PATCH weston] sdk: make C++11 plugins build again

[Thiago Macieira]

On segunda-feira, 9 de dezembro de 2013 15:57:16, Kristian Høgsberg wrote:
> Ugh, ok, sorry.  Maybe we need a private header file where we can hide
> all our C macros - ARRAY_LENGTH, static_assert, container_of etc.

This "poor man's static_assert" should work in C99 mode too:

#include <assert.h>
#if !defined(static_assert) && (!defined(__cplusplus) || __cplusplus < 201103L)
#  define static_assert(cond, msg)  enum { \
       CONCAT(_static_assert_, __COUNTER__) = sizeof(char[(cond) ? 1 : -1])  \
    };
#endif

For proper CONCAT defined elsewhere.

Or, for a public header:
#include <assert.h>
#if defined(static_assert) || (defined(__cplusplus) && __cplusplus >= 201103L)
#  define wl_static_assert(cond) static_assert(cond, #cond)
#else
#  define wl_static_assert(cond)  enum { \
       CONCAT(_static_assert_, __COUNTER__) = sizeof(char[(cond) ? 1 : -1])  \
    };
#endif

For failed assertions, it will produce:

C89, C99, C++98:
error: array size is negative

C11, C++11:
error: static_assert failed "fail"

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
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