Honour rustc flags when emitting MIR and emit both assembly and MIR in the same execution (#3116)gh-1284

* Honor compiler flags in rustc MIR output view

* Refactor rustc/MIR execution handling

Apply the same receipe as for GNAT and GCC for minimizing the number of
executions for getting extra outputs (here MIR).

After discussions in #3107, the way the output files are created is also
changed to use the syntax `--emit KIND=PATH` (see
https://doc.bccnsoft.com/docs/rust-1.36.0-docs-html/rustc/command-line-arguments.html)

Signed-off-by: Marc Poulhiès <dkm@kataplop.net>

* fixup! Refactor rustc/MIR execution handling

Co-authored-by: Nico Lehmann <nico.lehmannm@gmail.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/compilers/rust.js b/lib/compilers/rust.js
index 3072e8db4..7043b2b00 100644
--- a/lib/compilers/rust.js
+++ b/lib/compilers/rust.js
@@ -45,10 +45,22 @@ export class RustCompiler extends BaseCompiler {
         this.linker = this.compilerProps('linker');
     }
 
+    getRustMirOutputFilename(outputFilename) {
+        return outputFilename.replace(path.extname(outputFilename), '.mir');
+    }
+
     getSharedLibraryPathsAsArguments() {
         return [];
     }
 
+    optionsForBackend(backendOptions, outputFilename) {
+        if (backendOptions.produceRustMir && this.compiler.supportsRustMirView) {
+            const of = this.getRustMirOutputFilename(outputFilename);
+            return ['--emit', `mir=${of}`];
+        }
+        return [];
+    }
+
     optionsForFilter(filters, outputFilename, userOptions) {
         let options = ['-C', 'debuginfo=1', '-o', this.filename(outputFilename)];