[PATCH] rust: Disable --enable-languages=rust and silently exclude it from --enable-languages=all for GCC 13

[Richard Biener]

On Tue, 18 Apr 2023, Jakub Jelinek wrote:

> Hi!
> 
> As discussed on IRC, gccrs can't compile the standard libraries yet
> and requires annoying -frust-incomplete-and-experimental-compiler-do-not-use
> option to compile anything.
> 
> As such it is better to disable this at least for GCC 13.1, we'd keep
> it allowed on the trunk where hopefully support to compile at least
> some standard libraries will land soon and eventually a borrow checker.
> 
> If enough Rust support is backported from trunk to 13 branch before
> 13.2, we could revert this change then.
> 
> Tested on x86_64-linux with --enable-languages=c,c++,rust and
> --enable-languages=c,c++,all , ok for 13 branch?

OK.

Thanks,
Richard.

> 2023-04-18  Jakub Jelinek  <jakub@redhat.com>
> 
> 	* configure.ac: For --enable-languages= mentioning explicitly
> 	rust emit an error, if included in all etc., silently disable
> 	rust.
> 	* configure: Regenerated.
> 
> --- configure.ac.jj1	2023-04-17 13:47:26.527792492 +0200
> +++ configure.ac	2023-04-18 11:22:10.893011557 +0200
> @@ -2150,6 +2150,18 @@ if test -d ${srcdir}/gcc; then
>              ;;
>          esac
>  
> +        # Disable Rust for GCC 13 release.
> +        case ${add_this_lang}:${language} in
> +          yes:rust)
> +            # Specifically requested language; tell them.
> +            AC_MSG_ERROR([Rust is not supported in GCC 13 release])
> +           ;;
> +          *:rust)
> +            # Silently disable.
> +            add_this_lang=unsupported
> +            ;;
> +        esac
> +
>          # Disable jit if -enable-host-shared not specified
>          # but not if building for Mingw. All code in Windows
>          # is position independent code (PIC).
> --- configure.jj1	2023-04-17 13:47:26.519792608 +0200
> +++ configure	2023-04-18 11:22:33.500683809 +0200
> @@ -8909,6 +8909,18 @@ $as_echo "$as_me: WARNING: GDC is requir
>              ;;
>          esac
>  
> +        # Disable Rust for GCC 13 release.
> +        case ${add_this_lang}:${language} in
> +          yes:rust)
> +            # Specifically requested language; tell them.
> +            as_fn_error $? "Rust is not supported in GCC 13 release" "$LINENO" 5
> +           ;;
> +          *:rust)
> +            # Silently disable.
> +            add_this_lang=unsupported
> +            ;;
> +        esac
> +
>          # Disable jit if -enable-host-shared not specified
>          # but not if building for Mingw. All code in Windows
>          # is position independent code (PIC).
> 
> 	Jakub
> 
> 

-- 
Richard Biener <rguenther@suse.de>
SUSE Software Solutions Germany GmbH, Frankenstrasse 146, 90461 Nuernberg,
Germany; GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman;
HRB 36809 (AG Nuernberg)