Add support for Xclang flag '-mrelax-all'

Author: Snektron

src/compiler/clang.rs

@@ -239,6 +239,7 @@ counted_array!(pub static ARGS: [ArgInfo<gcc::ArgData>; _] = [
     take_arg!("-load", PathBuf, Separated, ExtraHashFile),
     flag!("-mconstructor-aliases", PassThroughFlag),
     take_arg!("-mllvm", OsString, Separated, PassThrough),
+    flag!("-mrelax-all", PassThroughFlag),
     flag!("-no-opaque-pointers", PreprocessorArgumentFlag),
     take_arg!("-plugin-arg", OsString, Concatenated('-'), PassThrough),
     take_arg!("-target", OsString, Separated, PassThrough),
@@ -911,6 +912,12 @@ mod test {
         assert_eq!(ovec!["-Xclang", "-mconstructor-aliases"], a.common_args);
     }
 
+    #[test]
+    fn test_parse_xclang_mrelax_all() {
+        let a = parses!("-c", "foo.c", "-o", "foo.o", "-Xclang", "-mrelax-all");
+        assert_eq!(ovec!["-Xclang", "-mrelax-all"], a.common_args);
+    }
+
     #[test]
     fn test_parse_fplugin() {
         let a = parses!("-c", "foo.c", "-o", "foo.o", "-fplugin", "plugin.so");