Re: C23 support in Autoconf

[Alan Coopersmith <alan.coopersmith@xxxxxxxxxx>]

On 5/2/24 04:01, Florian Weimer wrote:
> * Alan Coopersmith:
>
> > https://gitlab.freedesktop.org/xorg/driver/xf86-video-vbox/-/commit/b66441a27fa85e2a3b63f10a0a5a846344327042
>
> This change:
>
>   #ifndef __cplusplus
> +#if __STDC_VERSION__ >= 199901L
> +#include <stdbool.h>
> +#else
>   typedef enum
>   {
>       false = 0,
>       true
>   } bool;
> +#endif
>   # define RT_C_DECLS_BEGIN
>   # define RT_C_DECLS_END
>   #else
>   # define RT_C_DECLS_BEGIN extern "C" {
>   # define RT_C_DECLS_END }
>   #endif
>
> is not really ABI-compatible with the previous C version (although it
> restores ABI compatibility with the C++ version).  Is this an installed
> header?

No, it's an internal header, only used in compiling this single shared object,
so no ABI compatibility with prior versions is required.

--
        -Alan Coopersmith-                 alan.coopersmith@xxxxxxxxxx
         Oracle Solaris Engineering - https://blogs.oracle.com/solaris