rust: Disable --enable-languages=rust and silently exclude it from --enable-languages...

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?

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.

diff --git a/configure b/configure
index 858830994104960d205d02abe5152edd6f9eadb1..117a7ef23f222f6f1faed29342d3877c4e1d3999 100755 (executable)
--- a/configure
+++ b/configure
@@ -8909,6 +8909,18 @@ $as_echo "$as_me: WARNING: GDC is required to build $language" >&2;}
             ;;
         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).

diff --git a/configure.ac b/configure.ac
index 2b612dce6e9a1d3ab5eab994d7cf2a09c8a04916..b3e9bbd2aa516236b50b8856a063e3c0521e7eca 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -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).