diff --git a/pkgs/development/compilers/rustc/generic.nix b/pkgs/development/compilers/rustc/generic.nix
index b8d232b82a33..f9e458738571 100644
--- a/pkgs/development/compilers/rustc/generic.nix
+++ b/pkgs/development/compilers/rustc/generic.nix
@@ -125,11 +125,18 @@ stdenv.mkDerivation {
       --subst-var-by "ccPath" "${stdenv.cc}/bin/cc"
     substituteInPlace src/librustc_back/archive.rs \
       --subst-var-by "arPath" "${stdenv.cc.binutils}/bin/ar"
+    substituteInPlace src/librustc_back/target/mod.rs \
+      --subst-var-by "ccPath" "${stdenv.cc}/bin/cc" \
+      --subst-var-by "arPath" "${stdenv.cc.binutils}/bin/ar"
 
     substituteInPlace src/rust-installer/gen-install-script.sh \
       --replace /bin/echo "${coreutils}/bin/echo"
     substituteInPlace src/rust-installer/gen-installer.sh \
       --replace /bin/echo "${coreutils}/bin/echo"
+
+    # Workaround for NixOS/nixpkgs#8676
+    substituteInPlace mk/rustllvm.mk \
+      --replace "\$\$(subst  /,//," "\$\$(subst /,/,"
   '';
 
   buildInputs = [ which file perl curl python27 makeWrapper git valgrind procps ];
diff --git a/pkgs/development/compilers/rustc/head.nix b/pkgs/development/compilers/rustc/head.nix
index 5e5b41e8b250..2e890f2fb760 100644
--- a/pkgs/development/compilers/rustc/head.nix
+++ b/pkgs/development/compilers/rustc/head.nix
@@ -1,16 +1,16 @@
 { stdenv, callPackage }:
 callPackage ./generic.nix {
-  shortVersion = "1.0.0-dev";
+  shortVersion = "2015-07-01";
   isRelease = false;
-  # src rev for master on 2015-05-13
-  srcRev = "67433c1a309d3c9457e49f15e80a2d927d165996";
-  srcSha = "0idc3nh0sfjlv7m9710azx7n6awzwj6mhw3aybsb9bbagzy2sdsg";
-  snapshotHashLinux686 = "0bc8cffdce611fb71fd7d3d8e7cdbfaf748a4f16";
-  snapshotHashLinux64 = "94089740e48167c5975c92c139ae9c286764012f";
-  snapshotHashDarwin686 = "54cc35e76497e6e94fddf38d6e40e9d168491ddb";
-  snapshotHashDarwin64 = "43a1c1fba0d1dfee4c2ca310d506f8f5f51b3f6f";
-  snapshotDate = "2015-04-27";
-  snapshotRev = "857ef6e";
+  # src rev for master on 2015-07-01
+  srcRev = "bf3c979ec";
+  srcSha = "1xp2fjffz5bwxfs37w80bdhy9lv091ps7xbnsvxid2i91rbxfrkk";
+  snapshotHashLinux686 = "a6f22e481eabf098cc65bda97bf7e434a1fcc20b";
+  snapshotHashLinux64 = "5fd8698fdfe953e6c4d86cf4fa1d5f3a0053248c";
+  snapshotHashDarwin686 = "9a273324a6b63a40f67a553029c0a9fb692ffd1f";
+  snapshotHashDarwin64 = "e5b12cb7c179fc98fa905a3c84803645d946a6ae";
+  snapshotDate = "2015-05-24";
+  snapshotRev = "ba0e1cd";
   patches = [
     ./patches/head.patch
   ] ++ stdenv.lib.optional stdenv.needsPax ./patches/grsec.patch;
diff --git a/pkgs/development/compilers/rustc/patches/head.patch b/pkgs/development/compilers/rustc/patches/head.patch
index cd2320e84dfe..d7bede68682b 100644
--- a/pkgs/development/compilers/rustc/patches/head.patch
+++ b/pkgs/development/compilers/rustc/patches/head.patch
@@ -1,49 +1,20 @@
-diff --git a/src/etc/local_stage0.sh b/src/etc/local_stage0.sh
-index ca59b1c..65ee7bf 100755
---- a/src/etc/local_stage0.sh
-+++ b/src/etc/local_stage0.sh
-@@ -50,11 +50,6 @@ if [ -z $TARG_DIR ]; then
- fi
- 
- cp ${PREFIX}/bin/rustc${BIN_SUF} ${TARG_DIR}/stage0/bin/
--cp ${PREFIX}/${LIB_DIR}/${RUSTLIBDIR}/${TARG_DIR}/${LIB_DIR}/* ${TARG_DIR}/stage0/${LIB_DIR}/
--cp ${PREFIX}/${LIB_DIR}/${LIB_PREFIX}extra*${LIB_SUF} ${TARG_DIR}/stage0/${LIB_DIR}/
--cp ${PREFIX}/${LIB_DIR}/${LIB_PREFIX}rust*${LIB_SUF} ${TARG_DIR}/stage0/${LIB_DIR}/
--cp ${PREFIX}/${LIB_DIR}/${LIB_PREFIX}std*${LIB_SUF} ${TARG_DIR}/stage0/${LIB_DIR}/
--cp ${PREFIX}/${LIB_DIR}/${LIB_PREFIX}syntax*${LIB_SUF} ${TARG_DIR}/stage0/${LIB_DIR}/
- 
- # do not fail if one of the above fails, as all we need is a working rustc!
- exit 0
-diff --git a/src/librustc_back/archive.rs b/src/librustc_back/archive.rs
-index 9f5751c..c98828f 100644
---- a/src/librustc_back/archive.rs
-+++ b/src/librustc_back/archive.rs
-@@ -57,7 +57,7 @@ fn run_ar(handler: &ErrorHandler, maybe_ar_prog: &Option<String>,
-           paths: &[&Path]) -> Output {
-     let ar = match *maybe_ar_prog {
-         Some(ref ar) => &ar[..],
--        None => "ar"
-+        None => "@arPath@"
-     };
-     let mut cmd = Command::new(ar);
- 
-diff --git a/src/librustc_trans/back/link.rs b/src/librustc_trans/back/link.rs
-index ad77735..1764f71 100644
---- a/src/librustc_trans/back/link.rs
-+++ b/src/librustc_trans/back/link.rs
-@@ -360,8 +360,8 @@ pub fn mangle_internal_name_by_path_and_seq(path: PathElems, flav: &str) -> Stri
- 
- pub fn get_cc_prog(sess: &Session) -> String {
-     match sess.opts.cg.linker {
--        Some(ref linker) => return linker.to_string(),
--        None => sess.target.target.options.linker.clone(),
-+        Some(ref linker) => linker.to_string(),
-+        None => "@ccPath@".to_string(),
-     }
- }
- 
+diff --git a/src/librustc_back/target/mod.rs b/src/librustc_back/target/mod.rs
+index a42f861..bda4bde 100644
+--- a/src/librustc_back/target/mod.rs
++++ b/src/librustc_back/target/mod.rs
+@@ -172,8 +172,8 @@ impl Default for TargetOptions {
+     /// incomplete, and if used for compilation, will certainly not work.
+     fn default() -> TargetOptions {
+         TargetOptions {
+-            linker: "cc".to_string(),
+-            ar: "ar".to_string(),
++            linker: "@ccPath@".to_string(), // ignore-tidy-linelength
++            ar: "@arPath@".to_string(), // ignore-tidy-linelength
+             pre_link_args: Vec::new(),
+             post_link_args: Vec::new(),
+             cpu: "generic".to_string(),
 diff --git a/src/test/run-pass/issue-20797.rs b/src/test/run-pass/issue-20797.rs
-index 8b5e6f8..480ad79 100644
+index 2772fc8..3d37b08 100644
 --- a/src/test/run-pass/issue-20797.rs
 +++ b/src/test/run-pass/issue-20797.rs
 @@ -97,7 +97,7 @@ impl<S: Strategy> Iterator for Subpaths<S> {