[gcc r13-4672] gccrs: Add lang-spec.h

[Arthur Cohen <cohenarthur@gcc.gnu.org>]

https://gcc.gnu.org/g:ab1e0db43c2faf5e6dd0526a41410c36d346b4a6

commit r13-4672-gab1e0db43c2faf5e6dd0526a41410c36d346b4a6
Author: Philip Herron <philip.herron@embecosm.com>
Date:   Tue Aug 23 16:40:07 2022 +0100

    gccrs: Add lang-spec.h
    
    This specifies the extensions of the Rust language.
    
            gcc/rust/
            * lang-specs.h: New.

Diff:
---
 gcc/rust/lang-specs.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/gcc/rust/lang-specs.h b/gcc/rust/lang-specs.h
new file mode 100644
index 00000000000..eed28b1eb06
--- /dev/null
+++ b/gcc/rust/lang-specs.h
@@ -0,0 +1,26 @@
+/* lang-specs.h -- gcc driver specs for Rust frontend.
+   Copyright (C) 2009-2022 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it under
+   the terms of the GNU General Public License as published by the Free
+   Software Foundation; either version 3, or (at your option) any later
+   version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This is the contribution to the `default_compilers' array in gcc.cc
+   for the Rust language.  */
+
+{".rs", "@rust", 0, 1, 0},
+  {"@rust",
+   "rust1 %i %(cc1_options) %{I*} %{L*} %D %{!fsyntax-only:%(invoke_as)}", 0, 1,
+   0},