rustbuild: make libdir_relative a method

src/bootstrap/builder.rs

@@ -444,10 +444,11 @@ impl<'a> Builder<'a> {
 
             fn run(self, builder: &Builder) -> Interned<PathBuf> {
                 let compiler = self.compiler;
-                let lib = if compiler.stage >= 1 && builder.build.config.libdir_relative.is_some() {
-                    builder.build.config.libdir_relative.clone().unwrap()
+                let config = &builder.build.config;
+                let lib = if compiler.stage >= 1 && config.libdir_relative().is_some() {
+                    builder.build.config.libdir_relative().unwrap()
                 } else {
-                    PathBuf::from("lib")
+                    Path::new("lib")
                 };
                 let sysroot = builder.sysroot(self.compiler).join(lib)
                     .join("rustlib").join(self.target).join("lib");

src/bootstrap/compile.rs

@@ -516,8 +516,7 @@ fn rustc_cargo_env(build: &Build, cargo: &mut Command) {
          .env("CFG_VERSION", build.rust_version())
          .env("CFG_PREFIX", build.config.prefix.clone().unwrap_or_default());
 
-    let libdir_relative =
-        build.config.libdir_relative.clone().unwrap_or(PathBuf::from("lib"));
+    let libdir_relative = build.config.libdir_relative().unwrap_or(Path::new("lib"));
     cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
 
     // If we're not building a compiler with debugging information then remove

src/bootstrap/config.rs

@@ -17,7 +17,7 @@ use std::collections::{HashMap, HashSet};
 use std::env;
 use std::fs::File;
 use std::io::prelude::*;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::process;
 use std::cmp;
 
@@ -126,7 +126,6 @@ pub struct Config {
     pub docdir: Option<PathBuf>,
     pub bindir: Option<PathBuf>,
     pub libdir: Option<PathBuf>,
-    pub libdir_relative: Option<PathBuf>,
     pub mandir: Option<PathBuf>,
     pub codegen_tests: bool,
     pub nodejs: Option<PathBuf>,
@@ -418,22 +417,6 @@ impl Config {
             config.mandir = install.mandir.clone().map(PathBuf::from);
         }
 
-        // Try to infer `libdir_relative` from `libdir`.
-        if let Some(ref libdir) = config.libdir {
-            let mut libdir = libdir.as_path();
-            if !libdir.is_relative() {
-                // Try to make it relative to the prefix.
-                if let Some(ref prefix) = config.prefix {
-                    if let Ok(suffix) = libdir.strip_prefix(prefix) {
-                        libdir = suffix;
-                    }
-                }
-            }
-            if libdir.is_relative() {
-                config.libdir_relative = Some(libdir.to_path_buf());
-            }
-        }
-
         // Store off these values as options because if they're not provided
         // we'll infer default values for them later
         let mut thinlto = None;
@@ -581,6 +564,17 @@ impl Config {
         config
     }
 
+    /// Try to find the relative path of `libdir`.
+    pub fn libdir_relative(&self) -> Option<&Path> {
+        let libdir = self.libdir.as_ref()?;
+        if libdir.is_relative() {
+            Some(libdir)
+        } else {
+            // Try to make it relative to the prefix.
+            libdir.strip_prefix(self.prefix.as_ref()?).ok()
+        }
+    }
+
     pub fn verbose(&self) -> bool {
         self.verbose > 0
     }