gcc: use special native system headers for darwin

Darwin systems need to be able to find CoreFoundation headers as well as
libc headers. Somehow, gcc doesn't accept any "framework" parameters
that would normally be used to include CoreFoundation in this
situation.

HACK: Instead, this adds a derivation that combines the two. The result
works but probably not a good long term solution.

ALTERNATIVES: Maybe sending patches in to GCC to allow
"native-system-framework" configure flag to get this found.

pkgs/development/compilers/gcc/4.8/default.nix

@@ -33,6 +33,7 @@
 , libpthread ? null, libpthreadCross ? null  # required for GNU/Hurd
 , stripped ? true
 , gnused ? null
+, darwin ? null
 }:
 
 assert langJava     -> zip != null && unzip != null
@@ -358,7 +359,9 @@ stdenv.mkDerivation ({
       )
     }
     ${if cross == null
-      then " --with-native-system-header-dir=${getDev stdenv.libc}/include"
+      then if stdenv.isDarwin
+        then " --with-native-system-header-dir=${darwin.usr-include}"
+        else " --with-native-system-header-dir=${getDev stdenv.libc}/include"
       else ""}
     ${if langAda then " --enable-libada" else ""}
     ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}

pkgs/development/compilers/gcc/4.9/default.nix

@@ -33,6 +33,7 @@
 , libpthread ? null, libpthreadCross ? null  # required for GNU/Hurd
 , stripped ? true
 , gnused ? null
+, darwin ? null
 }:
 
 assert langJava     -> zip != null && unzip != null
@@ -365,7 +366,9 @@ stdenv.mkDerivation ({
       )
     }
     ${if cross == null
-      then " --with-native-system-header-dir=${getDev stdenv.libc}/include"
+      then if stdenv.isDarwin
+        then " --with-native-system-header-dir=${darwin.usr-include}"
+        else " --with-native-system-header-dir=${getDev stdenv.libc}/include"
       else ""}
     ${if langAda then " --enable-libada" else ""}
     ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}

pkgs/development/compilers/gcc/5/default.nix

@@ -35,6 +35,7 @@
 , gnused ? null
 , binutils ? null
 , cloog # unused; just for compat with gcc4, as we override the parameter on some places
+, darwin ? null
 }:
 
 assert langJava     -> zip != null && unzip != null
@@ -363,7 +364,9 @@ stdenv.mkDerivation ({
       )
     }
     ${if cross == null
-      then " --with-native-system-header-dir=${getDev stdenv.libc}/include"
+      then if stdenv.isDarwin
+        then " --with-native-system-header-dir=${darwin.usr-include}"
+        else " --with-native-system-header-dir=${getDev stdenv.libc}/include"
       else ""}
     ${if langAda then " --enable-libada" else ""}
     ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}

pkgs/development/compilers/gcc/6/default.nix

@@ -35,6 +35,7 @@
 , gnused ? null
 , binutils ? null
 , cloog # unused; just for compat with gcc4, as we override the parameter on some places
+, darwin ? null
 }:
 
 assert langJava     -> zip != null && unzip != null
@@ -361,7 +362,9 @@ stdenv.mkDerivation ({
       )
     }
     ${if cross == null
-      then " --with-native-system-header-dir=${getDev stdenv.libc}/include"
+      then if stdenv.isDarwin
+        then " --with-native-system-header-dir=${darwin.usr-include}"
+        else " --with-native-system-header-dir=${getDev stdenv.libc}/include"
       else ""}
     ${if langAda then " --enable-libada" else ""}
     ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}

pkgs/os-specific/darwin/usr-include/default.nix

@@ -0,0 +1,21 @@
+{stdenv, darwin}:
+
+/*
+ * This is needed to build GCC on Darwin.
+ *
+ * These are the collection of headers that would normally be available under
+ * /usr/include in OS X machines with command line tools installed. They need
+ * to be in one folder for gcc to use them correctly.
+ */
+
+stdenv.mkDerivation {
+  name = "darwin-usr-include";
+  buildInputs = [ darwin.CF stdenv.libc ];
+  buildCommand = ''
+    mkdir -p $out
+    cd $out
+    ln -sf ${stdenv.libc}/include/* .
+    mkdir CoreFoundation
+    ln -sf ${darwin.CF}/Library/Frameworks/CoreFoundation.framework/Headers/* CoreFoundation
+  '';
+}

pkgs/top-level/all-packages.nix

@@ -10958,6 +10958,8 @@ in
     libobjc = apple-source-releases.objc4;
 
     stubs = callPackages ../os-specific/darwin/stubs {};
+
+    usr-include = callPackage ../os-specific/darwin/macheaders.nix {};
   };
 
   devicemapper = lvm2;