From 54a1630b4abadb8f4b207ebf4baf5c8a6b5adb9a Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Tue, 18 Apr 2023 12:18:13 +0200
Subject: [PATCH] rust: Disable --enable-languages=rust and silently exclude it
 from --enable-languages=all for GCC 13

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.
---
 configure    | 12 ++++++++++++
 configure.ac | 12 ++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/configure b/configure
index 8588309..117a7ef 100755
--- 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 2b612dc..b3e9bbd 100644
--- 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).
-- 
2.7.4