clang-wrapper: Remove explicit dependency on libc++

Now libc++ is just another build input propagated from clang-wrapper.

pkgs/build-support/clang-wrapper/builder.sh

@@ -70,17 +70,11 @@ fi
 doSubstitute() {
     local src=$1
     local dst=$2
-    local uselibcxx=
-    local uselibcxxabi=
-    if test -n "$libcxx" && echo $dst | fgrep ++; then uselibcxx=$libcxx; fi
-    if test -n "$libcxxabi" && echo $dst | fgrep ++; then uselibcxxabi=$libcxxabi; fi
     # Can't use substitute() here, because replace may not have been
     # built yet (in the bootstrap).
     sed \
         -e "s^@out@^$out^g" \
         -e "s^@shell@^$shell^g" \
-        -e "s^@libcxx@^$uselibcxx^g" \
-        -e "s^@libcxxabi@^$uselibcxxabi^g" \
         -e "s^@clang@^$clang^g" \
         -e "s^@clangProg@^$clangProg^g" \
         -e "s^@binutils@^$binutils^g" \
@@ -151,3 +145,5 @@ cp -p $utils $out/nix-support/utils.sh
 if test -z "$nativeTools"; then
     echo $clang $binutils $libc > $out/nix-support/propagated-user-env-packages
 fi
+
+echo $extraPackages > $out/nix-support/propagated-native-build-inputs

pkgs/build-support/clang-wrapper/clang-wrapper.sh

@@ -79,11 +79,6 @@ if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE"; then
     NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE --sysroot=/var/empty"
 fi
 
-if test -n "@libcxx@"; then
-    NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem@libcxx@/include/c++/v1 -stdlib=libc++"
-    NIX_CFLAGS_LINK="$NIX_CFLAGS_LINK -L@libcxx@/lib -stdlib=libc++ -L@libcxxabi@/lib"
-fi
-
 # Add the flags for the C compiler proper.
 extraAfter=($NIX_CFLAGS_COMPILE)
 extraBefore=()

pkgs/build-support/clang-wrapper/default.nix

@@ -7,7 +7,7 @@
 
 { name ? "", stdenv, nativeTools, nativeLibc, nativePrefix ? ""
 , clang ? null, libc ? null, binutils ? null, coreutils ? null, shell ? ""
-, zlib ? null, libcxx ? null
+, zlib ? null, extraPackages ? []
 }:
 
 assert nativeTools -> nativePrefix != "";
@@ -35,9 +35,7 @@ stdenv.mkDerivation {
   utils = ../gcc-wrapper/utils.sh;
   addFlags = ./add-flags;
 
-  inherit nativeTools nativeLibc nativePrefix clang clangVersion libcxx;
-
-  libcxxabi = libcxx.abi or null;
+  inherit nativeTools nativeLibc nativePrefix clang clangVersion extraPackages;
 
   gcc = clang.gcc;
   libc = if nativeLibc then null else libc;

pkgs/development/libraries/libc++/default.nix

@@ -29,6 +29,8 @@ stdenv.mkDerivation rec {
   # Remove a Makefile that causes many retained dependencies.
   postInstall = "rm $out/include/c++/v1/Makefile";
 
+  setupHook = ./setup-hook.sh;
+
   meta = {
     homepage = http://libcxx.llvm.org/;
     description = "A new implementation of the C++ standard library, targeting C++11";

pkgs/development/libraries/libc++/setup-hook.sh

@@ -0,0 +1,2 @@
+NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem @out@/include/c++/v1 -stdlib=libc++"
+NIX_CFLAGS_LINK="$NIX_CFLAGS_LINK -stdlib=libc++"

pkgs/stdenv/darwin/default.nix

@@ -28,11 +28,12 @@ import ../generic rec {
     nativeTools = false;
     nativeLibc = true;
     inherit stdenv;
-    libcxx = if haveLibCxx then pkgs.libcxx.override {
-      libcxxabi = pkgs.libcxxabi.override {
-        libunwind = pkgs.libunwindNative;
-      };
-    } else null;
+    extraPackages =
+      stdenv.lib.optional haveLibCxx (pkgs.libcxx.override {
+        libcxxabi = pkgs.libcxxabi.override {
+          libunwind = pkgs.libunwindNative;
+        };
+      });
     binutils = import ../../build-support/native-darwin-cctools-wrapper {inherit stdenv;};
     clang = if useClang33 then pkgs.clang_33.clang else pkgs.clang.clang;
     coreutils = pkgs.coreutils;