Rollup merge of rust-lang#39587 - Keruspe:master, r=alexcrichton

rustbuild: support setting verbosity in config.toml

Most if not all the configuration is settable trhough config.toml but the verbosity isn't yet.

This avoids having to pass -v to x.py on each command if you want verbosity to be always on.

src/bootstrap/config.rs

@@ -148,6 +148,7 @@ struct Build {
     python: Option<String>,
     full_bootstrap: Option<bool>,
     extended: Option<bool>,
+    verbose: Option<usize>,
 }
 
 /// TOML representation of various global install decisions.
@@ -292,6 +293,7 @@ impl Config {
         set(&mut config.vendor, build.vendor);
         set(&mut config.full_bootstrap, build.full_bootstrap);
         set(&mut config.extended, build.extended);
+        set(&mut config.verbose, build.verbose);
 
         if let Some(ref install) = toml.install {
             config.prefix = install.prefix.clone().map(PathBuf::from);

src/bootstrap/config.toml.example

@@ -124,6 +124,9 @@
 # disabled by default.
 #extended = false
 
+# Verbosity level: 0 == not verbose, 1 == verbose, 2 == very verbose
+#verbose = 0
+
 # =============================================================================
 # General install configuration options
 # =============================================================================