diff --git a/pkgs/development/compilers/rustc/default.nix b/pkgs/development/compilers/rustc/default.nix
index 00bfb3222e0d..19e746d7dbf3 100644
--- a/pkgs/development/compilers/rustc/default.nix
+++ b/pkgs/development/compilers/rustc/default.nix
@@ -1,10 +1,11 @@
 { stdenv, callPackage }:
 
 callPackage ./generic.nix {
-  shortVersion = "1.3.0";
+  shortVersion = "1.4.0";
   isRelease = true;
+  forceBundledLLVM = false;
   configureFlags = [ "--release-channel=stable" ];
-  srcSha = "14lhk40n9aslz8h8wj7fas5vsgyrb38b2r319q3hlvplgggdksg8";
+  srcSha = "13wpi9nb3h6wwck2mxhza85fahzcwgas00w8m25086v34dha4dp1";
 
   /* Rust is bootstrapped from an earlier built version. We need
   to fetch these earlier versions, which vary per platform.
@@ -14,14 +15,14 @@ callPackage ./generic.nix {
   for the tagged release and not a snapshot in the current HEAD.
   */
 
-  snapshotHashLinux686 = "3459275cdf3896f678e225843fa56f0d9fdbabe8";
-  snapshotHashLinux64 = "e451e3bd6e5fcef71e41ae6f3da9fb1cf0e13a0c";
-  snapshotHashDarwin686 = "428944a7984c0988e77909d82ca2ef77d96a1fbd";
-  snapshotHashDarwin64 = "b0515bb7d2892b9a58282fc865fee11a885406d6";
-  snapshotDate = "2015-07-26";
-  snapshotRev = "a5c12f4";
+  snapshotHashLinux686 = "e2553bf399cd134a08ef3511a0a6ab0d7a667216";
+  snapshotHashLinux64 = "7df8ba9dec63ec77b857066109d4b6250f3d222f";
+  snapshotHashDarwin686 = "29750870c82a0347f8b8b735a4e2e0da26f5098d";
+  snapshotHashDarwin64 = "c9f2c588238b4c6998190c3abeb33fd6164099a2";
+  snapshotDate = "2015-08-11";
+  snapshotRev = "1af31d4";
 
   # cc-ar-opts.patch should be removable in 1.4.0+
-  patches = [ ./patches/remove-uneeded-git.patch ./patches/cc-ar-opts.patch ]
+  patches = [ ./patches/remove-uneeded-git.patch ]
     ++ stdenv.lib.optional stdenv.needsPax ./patches/grsec.patch;
 }
diff --git a/pkgs/development/compilers/rustc/patches/cc-ar-opts.patch b/pkgs/development/compilers/rustc/patches/cc-ar-opts.patch
deleted file mode 100644
index e73d54de8f59..000000000000
--- a/pkgs/development/compilers/rustc/patches/cc-ar-opts.patch
+++ /dev/null
@@ -1,57 +0,0 @@
-From c97759699264c6b1fa0e88420cd3c720df25e594 Mon Sep 17 00:00:00 2001
-From: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
-Date: Tue, 11 Aug 2015 01:09:21 +0200
-Subject: [PATCH] rustc_back: add configure options for default linker and ar
-
-Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
----
- configure                       | 4 ++++
- mk/target.mk                    | 4 ++++
- src/librustc_back/target/mod.rs | 4 ++--
- 3 files changed, 10 insertions(+), 2 deletions(-)
-
-diff --git a/configure b/configure
-index 071788c..dc9d7d7 100755
---- a/configure
-+++ b/configure
-@@ -607,6 +607,10 @@ valopt aarch64-linux-android-ndk "" "aarch64-linux-android NDK standalone path"
- valopt release-channel "dev" "the name of the release channel to build"
- valopt musl-root "/usr/local" "MUSL root installation directory"
- 
-+# Used on systems where "cc" and "ar" are unavailable
-+valopt default-linker "cc" "the default linker"
-+valopt default-ar     "ar" "the default ar"
-+
- # Many of these are saved below during the "writing configuration" step
- # (others are conditionally saved).
- opt_nosave manage-submodules 1 "let the build manage the git submodules"
-diff --git a/mk/target.mk b/mk/target.mk
-index aae66c4..408ab96 100644
---- a/mk/target.mk
-+++ b/mk/target.mk
-@@ -13,6 +13,10 @@
- # this exists can be found on issue #2400
- export CFG_COMPILER_HOST_TRIPLE
- 
-+# Used as defaults for the runtime ar and cc tools
-+export CFG_DEFAULT_LINKER
-+export CFG_DEFAULT_AR
-+
- # The standard libraries should be held up to a higher standard than any old
- # code, make sure that these common warnings are denied by default. These can
- # be overridden during development temporarily. For stage0, we allow warnings
-diff --git a/src/librustc_back/target/mod.rs b/src/librustc_back/target/mod.rs
-index d9cfdaa..542791a 100644
---- a/src/librustc_back/target/mod.rs
-+++ b/src/librustc_back/target/mod.rs
-@@ -185,8 +185,8 @@ impl Default for TargetOptions {
-     fn default() -> TargetOptions {
-         TargetOptions {
-             data_layout: String::new(),
--            linker: "cc".to_string(),
--            ar: "ar".to_string(),
-+            linker: option_env!("CFG_DEFAULT_LINKER").unwrap_or("cc").to_string(),
-+            ar: option_env!("CFG_DEFAULT_AR").unwrap_or("ar").to_string(),
-             pre_link_args: Vec::new(),
-             post_link_args: Vec::new(),
-             cpu: "generic".to_string(),