Use '.rs' extension for Rust in gdb_simple_compile

While trying out gccrs, I noticed that gdb_simple_compile does not use
the ".rs" extension for Rust sources.  This patch fixes the problem,
which lets gccrs get a little further in the test suite.

diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 0a582aac3548fc36e351c440e3dae600cde52512..98691dfce255e7bd50e024278866fea2913ae842 100644 (file)
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -5729,6 +5729,10 @@ proc gdb_simple_compile {name code {type object} {compile_flags {}} {object obj}
            set ext "d"
            break
        }
+       if { "$flag" eq "rust" } {
+           set ext "rs"
+           break
+       }
     }
     set src [standard_temp_file $name.$ext]
     set obj [standard_temp_file $name.$postfix]