Adding rustc-cg-gcc (#2746)

GCC backend for rustc is still in a very early state.
It is in the process of being merged in main rustc source:
https://github.com/rust-lang/compiler-team/issues/442

Currently reusing main rust compiler class and simply remove -Cllvm= argument if
any (only for intel asm syntax).

Disabling binary until the result is more friendly (currently binary are too
big).

refs #2683

1 files changed, 52 insertions, 0 deletions

diff --git a/lib/compilers/rustc-cg-gcc.js b/lib/compilers/rustc-cg-gcc.js
new file mode 100644
index 000000000..d12380f6b
--- /dev/null
+++ b/lib/compilers/rustc-cg-gcc.js
@@ -0,0 +1,52 @@
+// Copyright (c) 2021, Compiler Explorer Authors
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//     * Redistributions of source code must retain the above copyright notice,
+//       this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+import path from 'path';
+
+import { RustCompiler } from './rust';
+
+export class RustcCgGCCCompiler extends RustCompiler {
+    static get key() { return 'rustc-cg-gcc'; }
+
+    constructor(info, env) {
+        super(info, env);
+        this.compiler.supportsIrView = false;
+    }
+
+    optionsForFilter(filters, outputFilename, userOptions) {
+        // these options are direcly taken from rustc_codegen_gcc doc.
+        // See https://github.com/antoyo/rustc_codegen_gcc
+        let toolroot = path.resolve(path.dirname(this.compiler.exe), '..');
+
+        let options = ['-C', 'panic=abort',
+            '-Z', 'codegen-backend=librustc_codegen_gcc.so',
+            '--sysroot', toolroot + '/sysroot' ];
+
+        // rust.js makes the asumption that LLVM is used. This may go away when cranelift is available.
+        // Until this is the case and the super() class is refactored, simply ditch -Cllvm arg.
+        let super_options = super.optionsForFilter(filters, outputFilename, userOptions).filter(arg => !/-Cllvm.*/.test(arg));
+        options = options.concat(super_options);
+        return options;
+    }
+}