From 89f4b3c8bc90280f42cc640177c0287a1195c682 Mon Sep 17 00:00:00 2001
From: Rust Maintainers <pkg-rust-maintainers@lists.alioth.debian.org>
Date: Wed, 7 Mar 2018 19:07:27 +0000
Subject: [PATCH] u-rust-pr48362-libdir-relative

Gbp-Pq: Name u-rust-pr48362-libdir-relative.patch
---
 src/bootstrap/builder.rs |  7 ++++---
 src/bootstrap/compile.rs |  3 +--
 src/bootstrap/config.rs  | 13 ++++++++++++-
 3 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index a660b5cf85..082651de3c 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -357,10 +357,11 @@ 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.is_some() {
-                    builder.build.config.libdir.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");
diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index c6adfc7ffa..6ccfce54b9 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -513,8 +513,7 @@ pub fn rustc_cargo(build: &Build,
          .env("CFG_VERSION", build.rust_version())
          .env("CFG_PREFIX", build.config.prefix.clone().unwrap_or_default());
 
-    let libdir_relative =
-        build.config.libdir.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
diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
index 72e75fddc1..b138e1a58e 100644
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -17,7 +17,7 @@ use std::collections::HashMap;
 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;
 
@@ -542,6 +542,17 @@ 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
     }
-- 
2.30.2