3 files changed, 25 insertions, 5 deletions
diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index 71a89cd6d76..5abc0455b58 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -1119,10 +1119,15 @@ impl<'a> Builder<'a> {
             cargo.arg("-v");
         }
 
-        // This must be kept before the thinlto check, as we set codegen units
-        // to 1 forcibly there.
-        if let Some(n) = self.config.rust_codegen_units {
-            cargo.env("RUSTC_CODEGEN_UNITS", n.to_string());
+        match (mode, self.config.rust_codegen_units_std, self.config.rust_codegen_units) {
+            (Mode::Std, Some(n), _) |
+            (Mode::Test, Some(n), _) |
+            (_, _, Some(n)) => {
+                cargo.env("RUSTC_CODEGEN_UNITS", n.to_string());
+            }
+            _ => {
+                // Don't set anything
+            }
         }
 
         if self.config.rust_optimize {
diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
index a9d330e06a1..3eb6e8d84e8 100644
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -95,6 +95,7 @@ pub struct Config {
     // rust codegen options
     pub rust_optimize: bool,
     pub rust_codegen_units: Option<u32>,
+    pub rust_codegen_units_std: Option<u32>,
     pub rust_debug_assertions: bool,
     pub rust_debuginfo: bool,
     pub rust_debuginfo_lines: bool,
@@ -294,6 +295,7 @@ impl Default for StringOrBool {
 struct Rust {
     optimize: Option<bool>,
     codegen_units: Option<u32>,
+    codegen_units_std: Option<u32>,
     debug_assertions: Option<bool>,
     debuginfo: Option<bool>,
     debuginfo_lines: Option<bool>,
@@ -580,6 +582,8 @@ impl Config {
                 Some(n) => config.rust_codegen_units = Some(n),
                 None => {}
             }
+
+            config.rust_codegen_units_std = rust.codegen_units_std;
         }
 
         if let Some(ref t) = toml.target {
diff --git a/src/bootstrap/configure.py b/src/bootstrap/configure.py
index 0cf84a62986..ddb894eb1f6 100755
--- a/src/bootstrap/configure.py
+++ b/src/bootstrap/configure.py
@@ -393,6 +393,13 @@ for target in configured_targets:
     targets[target][0] = targets[target][0].replace("x86_64-unknown-linux-gnu", target)
 
 
+def is_number(value):
+  try:
+    float(value)
+    return True
+  except:
+    return False
+
 # Here we walk through the constructed configuration we have from the parsed
 # command line arguments. We then apply each piece of configuration by
 # basically just doing a `sed` to change the various configuration line to what
@@ -406,7 +413,11 @@ def to_toml(value):
     elif isinstance(value, list):
         return '[' + ', '.join(map(to_toml, value)) + ']'
     elif isinstance(value, str):
-        return "'" + value + "'"
+        # Don't put quotes around numeric values
+        if is_number(value):
+            return value
+        else:
+            return "'" + value + "'"
     else:
         raise RuntimeError('no toml')