ghc: Clean up, and add passthru.prefix, in preparation for cross

No hashes should be changed.

pkgs/development/compilers/ghc/6.10.2-binary.nix

@@ -1,24 +1,29 @@
-{stdenv, lib, fetchurl, perl, libedit, ncurses5, gmp}:
+{ stdenv
+, fetchurl, perl
+, libedit, ncurses5, gmp
+}:
+
+# Prebuilt only does native
+assert stdenv.targetPlatform == stdenv.hostPlatform;
 
 stdenv.mkDerivation rec {
   version = "6.10.2";
 
   name = "ghc-${version}-binary";
 
-  src =
+  src = {
-    if stdenv.system == "i686-linux" then
+      "i686-linux" = fetchurl {
-      fetchurl {
         # This binary requires libedit.so.0 (rather than libedit.so.2).
         url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-i386-unknown-linux.tar.bz2";
         sha256 = "1fw0zr2qshlpk8s0d16k27zcv5263nqdg2xds5ymw8ff6qz9rz9b";
-      }
+      };
-    else if stdenv.system == "x86_64-linux" then
+      "x86_64-linux" = fetchurl {
-      fetchurl {
         # Idem.
         url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-x86_64-unknown-linux.tar.bz2";
         sha256 = "1rd2j7lmcfsm2rdfb5g6q0l8dz3sxadk5m3d2f69d4a6g4p4h7jj";
-      }
+      };
-    else throw "cannot bootstrap GHC on this platform";
+    }.${stdenv.hostPlatform.system}
+      or (throw "cannot bootstrap GHC on this platform");
 
   buildInputs = [perl];
 
@@ -37,17 +42,17 @@ stdenv.mkDerivation rec {
      '' +
     # On Linux, use patchelf to modify the executables so that they can
     # find editline/gmp.
-    (if stdenv.isLinux then ''
+    stdenv.lib.optionalString stdenv.hostPlatform.isLinux ''
       find . -type f -perm -0100 \
           -exec patchelf --interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
           --set-rpath "${lib.makeLibraryPath [ libedit ncurses5 gmp ]}" {} \;
       for prog in ld ar gcc strip ranlib; do
         find . -name "setup-config" -exec sed -i "s@/usr/bin/$prog@$(type -p $prog)@g" {} \;
       done
-     '' else "");
+     '';
 
   configurePhase = ''
-    ./configure --prefix=$out --with-gmp-libraries=${lib.getLib gmp}/lib --with-gmp-includes=${lib.getDev gmp}/include
+    ./configure --prefix=$out --with-gmp-libraries=${stdenv.lib.getLib gmp}/lib --with-gmp-includes=${stdenv.lib.getDev gmp}/include
   '';
 
   # Stripping combined with patchelf breaks the executables (they die
@@ -62,7 +67,7 @@ stdenv.mkDerivation rec {
   # and create some wrapper scripts that set DYLD_FRAMEWORK_PATH so
   # that the executables work with no special setup.
   postInstall =
-    (if stdenv.isDarwin then
+    stdenv.lib.optionalString stdenv.hostPlatform.isDarwin
       ''
         mkdir -p $out/frameworks/GMP.framework/Versions/A
         ln -s ${gmp.out}/lib/libgmp.dylib $out/frameworks/GMP.framework/GMP
@@ -79,7 +84,7 @@ stdenv.mkDerivation rec {
             echo \"DYLD_FRAMEWORK_PATH=$out/frameworks exec $out/bin-orig/$i -framework-path $out/frameworks \\\"\\$@\\\"\" >> $out/bin/$i
             chmod +x $out/bin/$i
         done
-      '' else "")
+      ''
     +
       ''
         # bah, the passing gmp doesn't work, so let's add it to the final package.conf in a quick but dirty way

pkgs/development/compilers/ghc/6.10.4.nix

@@ -1,5 +1,8 @@
 {stdenv, fetchurl, libedit, ghc, perl, gmp, ncurses}:
 
+# TODO(@Ericson2314): Cross compilation support
+assert stdenv.targetPlatform == stdenv.hostPlatform;
+
 stdenv.mkDerivation rec {
   version = "6.10.4";
 
@@ -22,6 +25,8 @@ stdenv.mkDerivation rec {
 
   NIX_CFLAGS_COMPILE = "-fomit-frame-pointer";
 
+  passthru = { prefix = ""; };
+
   meta = {
     homepage = http://haskell.org/ghc;
     description = "The Glasgow Haskell Compiler";

pkgs/development/compilers/ghc/6.12.3.nix

@@ -1,5 +1,8 @@
 {stdenv, fetchurl, ghc, perl, gmp, ncurses}:
 
+# TODO(@Ericson2314): Cross compilation support
+assert stdenv.targetPlatform == stdenv.hostPlatform;
+
 stdenv.mkDerivation rec {
   version = "6.12.3";
 
@@ -33,6 +36,8 @@ stdenv.mkDerivation rec {
   # that in turn causes GHCi to abort
   stripDebugFlags=["-S" "--keep-file-symbols"];
 
+  passthru = { prefix = ""; };
+
   meta = {
     homepage = http://haskell.org/ghc;
     description = "The Glasgow Haskell Compiler";

pkgs/development/compilers/ghc/7.0.4-binary.nix

@@ -1,32 +1,35 @@
-{stdenv, fetchurl, perl, ncurses5, gmp, libiconv}:
+{ stdenv
+, fetchurl, perl
+, ncurses5, gmp, libiconv
+}:
+
+# Prebuilt only does native
+assert stdenv.targetPlatform == stdenv.hostPlatform;
 
 stdenv.mkDerivation rec {
   version = "7.0.4";
 
   name = "ghc-${version}-binary";
 
-  src =
+  src = {
-    if stdenv.system == "i686-linux" then
+      "i686-linux" = fetchurl {
-      fetchurl {
         url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-i386-unknown-linux.tar.bz2";
         sha256 = "0mfnihiyjl06f5w1yrjp36sw9g67g2ymg5sdl0g23h1pab99jx63";
-      }
+      };
-    else if stdenv.system == "x86_64-linux" then
+      "x86_64-linux" = fetchurl {
-      fetchurl {
         url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-x86_64-unknown-linux.tar.bz2";
         sha256 = "0mc4rhqcxz427wq4zgffmnn0d2yjqvy6af4x9mha283p1gdj5q99";
-      }
+      };
-    else if stdenv.system == "i686-darwin" then
+      "i686-darwin" = fetchurl {
-      fetchurl {
         url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-i386-apple-darwin.tar.bz2";
         sha256 = "0qj45hslrrr8zfks8m1jcb3awwx9rh35ndnpfmb0gwb6j7azq5n3";
-      }
+      };
-    else if stdenv.system == "x86_64-darwin" then
+      "x86_64-darwin" = fetchurl {
-      fetchurl {
         url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-x86_64-apple-darwin.tar.bz2";
         sha256 = "1m2ml88p1swf4dnv2vq8hz4drcp46n3ahpfi05wh01ajkf8hnn3l";
-      }
+      };
-    else throw "cannot bootstrap GHC on this platform";
+    }.${stdenv.hostPlatform.system}
+      or (throw "cannot bootstrap GHC on this platform");
 
   buildInputs = [perl];
 

pkgs/development/compilers/ghc/7.0.4.nix

@@ -1,5 +1,8 @@
 { stdenv, fetchurl, ghc, perl, gmp, ncurses, libiconv }:
 
+# TODO(@Ericson2314): Cross compilation support
+assert stdenv.targetPlatform == stdenv.hostPlatform;
+
 stdenv.mkDerivation rec {
   version = "7.0.4";
   name = "ghc-${version}";
@@ -42,6 +45,8 @@ stdenv.mkDerivation rec {
   # that in turn causes GHCi to abort
   stripDebugFlags=["-S" "--keep-file-symbols"];
 
+  passthru = { prefix = ""; };
+
   meta = {
     homepage = http://haskell.org/ghc;
     description = "The Glasgow Haskell Compiler";

pkgs/development/compilers/ghc/7.10.2.nix

@@ -1,14 +1,28 @@
-{ stdenv, fetchurl, fetchpatch, bootPkgs, perl, ncurses, libiconv, binutils, coreutils
+{ stdenv, __targetPackages
-, libxml2, libxslt, docbook_xsl, docbook_xml_dtd_45, docbook_xml_dtd_42, hscolour
+, buildPlatform, hostPlatform, targetPlatform
 
-  # If enabled GHC will be build with the GPL-free but slower integer-simple
+# build-tools
+, bootPkgs, hscolour
+, binutils, coreutils, fetchurl, fetchpatch, perl
+, docbook_xsl, docbook_xml_dtd_45, docbook_xml_dtd_42, libxml2, libxslt
+
+, ncurses, libiconv
+
+, # If enabled GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
-, enableIntegerSimple ? false, gmp
+  enableIntegerSimple ? false, gmp ? null
 }:
 
+assert !enableIntegerSimple -> gmp != null;
+
 let
   inherit (bootPkgs) ghc;
 
+  # TODO(@Ericson2314) Make unconditional
+  prefix = stdenv.lib.optionalString
+    (targetPlatform != hostPlatform)
+    "${targetPlatform.config}-";
+
   buildMK = ''
     libraries/terminfo_CONFIGURE_OPTS += --configure-option=--with-curses-includes="${ncurses.dev}/include"
     libraries/terminfo_CONFIGURE_OPTS += --configure-option=--with-curses-libraries="${ncurses.out}/lib"
@@ -27,7 +41,7 @@ in
 
 stdenv.mkDerivation rec {
   version = "7.10.2";
-  name = "ghc-${version}";
+  name = "${prefix}ghc-${version}";
 
   src = fetchurl {
     url = "https://downloads.haskell.org/~ghc/7.10.2/${name}-src.tar.xz";
@@ -64,7 +78,7 @@ stdenv.mkDerivation rec {
 
   postInstall = ''
     # Install the bash completion file.
-    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/ghc
+    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/${prefix}ghc
 
     # Patch scripts to include "readelf" and "cat" in $PATH.
     for i in "$out/bin/"*; do
@@ -75,7 +89,7 @@ stdenv.mkDerivation rec {
   '';
 
   passthru = {
-    inherit bootPkgs;
+    inherit bootPkgs prefix;
   };
 
   meta = {

pkgs/development/compilers/ghc/7.10.3.nix

@@ -1,14 +1,28 @@
-{ stdenv, fetchurl, fetchpatch, bootPkgs, perl, ncurses, libiconv, binutils, coreutils
+{ stdenv, __targetPackages
-, libxml2, libxslt, docbook_xsl, docbook_xml_dtd_45, docbook_xml_dtd_42, hscolour
+, buildPlatform, hostPlatform, targetPlatform
 
-  # If enabled GHC will be build with the GPL-free but slower integer-simple
+# build-tools
+, bootPkgs, hscolour
+, binutils, coreutils, fetchurl, fetchpatch, perl
+, docbook_xsl, docbook_xml_dtd_45, docbook_xml_dtd_42, libxml2, libxslt
+
+, ncurses, libiconv
+
+, # If enabled GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
-, enableIntegerSimple ? false, gmp
+  enableIntegerSimple ? false, gmp ? null
 }:
 
+assert !enableIntegerSimple -> gmp != null;
+
 let
   inherit (bootPkgs) ghc;
 
+  # TODO(@Ericson2314) Make unconditional
+  prefix = stdenv.lib.optionalString
+    (targetPlatform != hostPlatform)
+    "${targetPlatform.config}-";
+
   docFixes = fetchurl {
     url = "https://downloads.haskell.org/~ghc/7.10.3/ghc-7.10.3a.patch";
     sha256 = "1j45z4kcd3w1rzm4hapap2xc16bbh942qnzzdbdjcwqznsccznf0";
@@ -18,7 +32,7 @@ in
 
 stdenv.mkDerivation rec {
   version = "7.10.3";
-  name = "ghc-${version}";
+  name = "${prefix}ghc-${version}";
 
   src = fetchurl {
     url = "https://downloads.haskell.org/~ghc/${version}/${name}-src.tar.xz";
@@ -62,7 +76,7 @@ stdenv.mkDerivation rec {
 
   postInstall = ''
     # Install the bash completion file.
-    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/ghc
+    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/${prefix}ghc
 
     # Patch scripts to include "readelf" and "cat" in $PATH.
     for i in "$out/bin/"*; do
@@ -73,7 +87,7 @@ stdenv.mkDerivation rec {
   '';
 
   passthru = {
-    inherit bootPkgs;
+    inherit bootPkgs prefix;
   };
 
   meta = {

pkgs/development/compilers/ghc/7.2.2.nix

@@ -2,9 +2,12 @@
 
   # If enabled GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
-, enableIntegerSimple ? false, gmp
+, enableIntegerSimple ? false, gmp ? null
 }:
 
+# TODO(@Ericson2314): Cross compilation support
+assert stdenv.targetPlatform == stdenv.hostPlatform;
+
 stdenv.mkDerivation rec {
   version = "7.2.2";
   name = "ghc-${version}";
@@ -51,6 +54,8 @@ stdenv.mkDerivation rec {
   # that in turn causes GHCi to abort
   stripDebugFlags=["-S" "--keep-file-symbols"];
 
+  passthru = { prefix = ""; };
+
   meta = {
     homepage = http://haskell.org/ghc;
     description = "The Glasgow Haskell Compiler";

pkgs/development/compilers/ghc/7.4.2-binary.nix

@@ -1,32 +1,35 @@
-{stdenv, fetchurl, perl, ncurses5, gmp, libiconv, makeWrapper}:
+{ stdenv
+, fetchurl, perl, makeWrapper
+, ncurses5, gmp, libiconv
+}:
+
+# Prebuilt only does native
+assert stdenv.targetPlatform == stdenv.hostPlatform;
 
 stdenv.mkDerivation rec {
   version = "7.4.2";
 
   name = "ghc-${version}-binary";
 
-  src =
+  src = {
-    if stdenv.system == "i686-linux" then
+      "i686-linux" = fetchurl {
-      fetchurl {
         url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-i386-unknown-linux.tar.bz2";
         sha256 = "0gny7knhss0w0d9r6jm1gghrcb8kqjvj94bb7hxf9syrk4fxlcxi";
-      }
+      };
-    else if stdenv.system == "x86_64-linux" then
+      "x86_64-linux" = fetchurl {
-      fetchurl {
         url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-x86_64-unknown-linux.tar.bz2";
         sha256 = "043jabd0lh6n1zlqhysngbpvlsdznsa2mmsj08jyqgahw9sjb5ns";
-      }
+      };
-    else if stdenv.system == "i686-darwin" then
+      "i686-darwin" =  fetchurl {
-      fetchurl {
         url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-i386-apple-darwin.tar.bz2";
         sha256 = "1vrbs3pzki37hzym1f1nh07lrqh066z3ypvm81fwlikfsvk4djc0";
-      }
+      };
-    else if stdenv.system == "x86_64-darwin" then
+      "x86_64-darwin" = fetchurl {
-      fetchurl {
         url = "http://haskell.org/ghc/dist/${version}/ghc-${version}-x86_64-apple-darwin.tar.bz2";
         sha256 = "1imzqc0slpg0r6p40n5a9m18cbcm0m86z8dgyhfxcckksw54mzwf";
-      }
+      };
-    else throw "cannot bootstrap GHC on this platform";
+    }.${stdenv.hostPlatform.system}
+      or (throw "cannot bootstrap GHC on this platform");
 
   buildInputs = [perl];
 

pkgs/development/compilers/ghc/7.4.2.nix

@@ -1,10 +1,14 @@
 { stdenv, fetchurl, ghc, perl, ncurses, libiconv
 
-  # If enabled GHC will be build with the GPL-free but slower integer-simple
+, # If enabled GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
-, enableIntegerSimple ? false, gmp
+  enableIntegerSimple ? false, gmp ? null
 }:
 
+# TODO(@Ericson2314): Cross compilation support
+assert stdenv.targetPlatform == stdenv.hostPlatform;
+assert !enableIntegerSimple -> gmp != null;
+
 stdenv.mkDerivation rec {
   version = "7.4.2";
 
@@ -52,6 +56,8 @@ stdenv.mkDerivation rec {
   # that in turn causes GHCi to abort
   stripDebugFlags = [ "-S" ] ++ stdenv.lib.optional (!stdenv.isDarwin) "--keep-file-symbols";
 
+  passthru = { prefix = ""; };
+
   meta = {
     homepage = http://haskell.org/ghc;
     description = "The Glasgow Haskell Compiler";

pkgs/development/compilers/ghc/7.6.3.nix

@@ -1,10 +1,14 @@
 { stdenv, fetchurl, ghc, perl, ncurses, binutils, libiconv
 
-  # If enabled GHC will be build with the GPL-free but slower integer-simple
+, # If enabled GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
-, enableIntegerSimple ? false, gmp
+  enableIntegerSimple ? false, gmp ? null
 }:
 
+# TODO(@Ericson2314): Cross compilation support
+assert stdenv.targetPlatform == stdenv.hostPlatform;
+assert !enableIntegerSimple -> gmp != null;
+
 let
   # The "-Wa,--noexecstack" options might be needed only with GNU ld (as opposed
   # to the gold linker). It prevents binaries' stacks from being marked as
@@ -78,6 +82,8 @@ in stdenv.mkDerivation rec {
   # that in turn causes GHCi to abort
   stripDebugFlags = [ "-S" ] ++ stdenv.lib.optional (!stdenv.isDarwin) "--keep-file-symbols";
 
+  passthru = { prefix = ""; };
+
   meta = {
     homepage = http://haskell.org/ghc;
     description = "The Glasgow Haskell Compiler";

pkgs/development/compilers/ghc/7.8.3.nix

@@ -1,10 +1,14 @@
 { stdenv, fetchurl, ghc, perl, ncurses, libiconv
 
-  # If enabled GHC will be build with the GPL-free but slower integer-simple
+, # If enabled GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
-, enableIntegerSimple ? false, gmp
+  enableIntegerSimple ? false, gmp ? null
 }:
 
+# TODO(@Ericson2314): Cross compilation support
+assert stdenv.targetPlatform == stdenv.hostPlatform;
+assert !enableIntegerSimple -> gmp != null;
+
 stdenv.mkDerivation rec {
   version = "7.8.3";
   name = "ghc-${version}";
@@ -49,6 +53,8 @@ stdenv.mkDerivation rec {
   # that in turn causes GHCi to abort
   stripDebugFlags = [ "-S" ] ++ stdenv.lib.optional (!stdenv.isDarwin) "--keep-file-symbols";
 
+  passthru = { prefix = ""; };
+
   meta = {
     homepage = http://haskell.org/ghc;
     description = "The Glasgow Haskell Compiler";

pkgs/development/compilers/ghc/7.8.4.nix

@@ -1,10 +1,14 @@
 { stdenv, fetchurl, ghc, perl, ncurses, libiconv
 
-  # If enabled GHC will be build with the GPL-free but slower integer-simple
+, # If enabled GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
-, enableIntegerSimple ? false, gmp
+  enableIntegerSimple ? false, gmp ? null
 }:
 
+# TODO(@Ericson2314): Cross compilation support
+assert stdenv.targetPlatform == stdenv.hostPlatform;
+assert !enableIntegerSimple -> gmp != null;
+
 stdenv.mkDerivation (rec {
   version = "7.8.4";
   name = "ghc-${version}";
@@ -49,6 +53,8 @@ stdenv.mkDerivation (rec {
   # that in turn causes GHCi to abort
   stripDebugFlags = [ "-S" ] ++ stdenv.lib.optional (!stdenv.isDarwin) "--keep-file-symbols";
 
+  passthru = { prefix = ""; };
+
   meta = {
     homepage = http://haskell.org/ghc;
     description = "The Glasgow Haskell Compiler";

pkgs/development/compilers/ghc/8.0.2.nix

@@ -1,18 +1,30 @@
-{ stdenv, lib, fetchurl, fetchpatch, bootPkgs, perl, ncurses, libiconv, binutils, coreutils
+{ stdenv, __targetPackages
-, hscolour, patchutils, sphinx
+, buildPlatform, hostPlatform, targetPlatform
 
-  # If enabled GHC will be build with the GPL-free but slower integer-simple
+# build-tools
+, bootPkgs, hscolour
+, binutils, coreutils, fetchurl, fetchpatch, patchutils, perl, sphinx
+
+, libiconv, ncurses
+
+, # If enabled GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
-, enableIntegerSimple ? false, gmp
+  enableIntegerSimple ? false, gmp ? null
-, cross ? null
 }:
 
+assert !enableIntegerSimple -> gmp != null;
+
 let
   inherit (bootPkgs) ghc;
+
+  # TODO(@Ericson2314) Make unconditional
+  prefix = stdenv.lib.optionalString
+    (targetPlatform != hostPlatform)
+    "${targetPlatform.config}-";
 in
 stdenv.mkDerivation rec {
   version = "8.0.2";
-  name = "ghc-${version}";
+  name = "${prefix}ghc-${version}";
 
   src = fetchurl {
     url = "https://downloads.haskell.org/~ghc/8.0.2/${name}-src.tar.xz";
@@ -47,19 +59,20 @@ stdenv.mkDerivation rec {
     "--with-gmp-includes=${gmp.dev}/include" "--with-gmp-libraries=${gmp.out}/lib"
   ] ++ stdenv.lib.optional stdenv.isDarwin [
     "--with-iconv-includes=${libiconv}/include" "--with-iconv-libraries=${libiconv}/lib"
-  ] ++
+  ] ++ stdenv.lib.optionals (targetPlatform.isDarwin && targetPlatform.isAarch64) [
     # fix for iOS: https://www.reddit.com/r/haskell/comments/4ttdz1/building_an_osxi386_to_iosarm64_cross_compiler/d5qvd67/
-    lib.optional (cross.config or null == "aarch64-apple-darwin14") "--disable-large-address-space";
+    "--disable-large-address-space"
+  ];
 
   # required, because otherwise all symbols from HSffi.o are stripped, and
   # that in turn causes GHCi to abort
   stripDebugFlags = [ "-S" ] ++ stdenv.lib.optional (!stdenv.isDarwin) "--keep-file-symbols";
 
   postInstall = ''
-    paxmark m $out/lib/${name}/bin/{ghc,haddock}
+    paxmark m $out/lib/${name}/bin/${if targetPlatform != hostPlatform then "ghc" else "{ghc,haddock}"}
 
     # Install the bash completion file.
-    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/ghc
+    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/${prefix}ghc
 
     # Patch scripts to include "readelf" and "cat" in $PATH.
     for i in "$out/bin/"*; do
@@ -70,7 +83,7 @@ stdenv.mkDerivation rec {
   '';
 
   passthru = {
-    inherit bootPkgs;
+    inherit bootPkgs prefix;
   };
 
   meta = {

pkgs/development/compilers/ghc/8.2.1.nix

@@ -1,16 +1,30 @@
-{ stdenv, lib, fetchurl, bootPkgs, perl, ncurses, libiconv, binutils, coreutils
+{ stdenv, __targetPackages
-, autoconf, automake, happy, alex, python3, sphinx, hscolour
+, buildPlatform, hostPlatform, targetPlatform
-, buildPlatform, targetPlatform , selfPkgs, cross ? null
+, selfPkgs, cross ? null
 
-  # If enabled GHC will be build with the GPL-free but slower integer-simple
+# build-tools
+, bootPkgs, alex, happy, hscolour
+, autoconf, automake, binutils, coreutils, fetchurl, perl, python3, sphinx
+
+, libiconv ? null, ncurses
+
+, # If enabled, GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
-, enableIntegerSimple ? false, gmp
+  enableIntegerSimple ? false, gmp ? null
 }:
 
+assert !enableIntegerSimple -> gmp != null;
+
 let
   inherit (bootPkgs) ghc;
+
   version = "8.2.1";
 
+  # TODO(@Ericson2314) Make unconditional
+  prefix = stdenv.lib.optionalString
+    (targetPlatform != hostPlatform)
+    "${targetPlatform.config}-";
+  
   commonBuildInputs = [ alex autoconf automake ghc happy hscolour perl python3 sphinx ];
   commonPreConfigure =  ''
     sed -i -e 's|-isysroot /Developer/SDKs/MacOSX10.5.sdk||' configure
@@ -21,9 +35,10 @@ let
   '' + stdenv.lib.optionalString enableIntegerSimple ''
     echo "INTEGER_LIBRARY=integer-simple" > mk/build.mk
   '';
-in stdenv.mkDerivation (rec {
+in
+stdenv.mkDerivation (rec {
   inherit version;
-  name = "ghc-${version}";
+  name = "${prefix}ghc-${version}";
 
   src = fetchurl {
     url = "https://downloads.haskell.org/~ghc/${version}/${name}-src.tar.xz";
@@ -52,15 +67,17 @@ in stdenv.mkDerivation (rec {
 
   # required, because otherwise all symbols from HSffi.o are stripped, and
   # that in turn causes GHCi to abort
-  stripDebugFlags = [ "-S" ] ++ stdenv.lib.optional (!stdenv.isDarwin) "--keep-file-symbols";
+  stripDebugFlags = [ "-S" ] ++ stdenv.lib.optional (!targetPlatform.isDarwin) "--keep-file-symbols";
 
   checkTarget = "test";
 
+  # zsh and other shells are smart about `{ghc}` but bash isn't, and doesn't
+  # treat that as a unary `{x,y,z,..}` repetition.
   postInstall = ''
-    paxmark m $out/lib/${name}/bin/{ghc,haddock}
+    paxmark m $out/lib/${name}/bin/${if targetPlatform != hostPlatform then "ghc" else "{ghc,haddock}"}
 
     # Install the bash completion file.
-    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/ghc
+    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/${prefix}ghc
 
     # Patch scripts to include "readelf" and "cat" in $PATH.
     for i in "$out/bin/"*; do
@@ -73,7 +90,7 @@ in stdenv.mkDerivation (rec {
   outputs = [ "out" "doc" ];
 
   passthru = {
-    inherit bootPkgs;
+    inherit bootPkgs prefix;
   } // stdenv.lib.optionalAttrs (targetPlatform != buildPlatform) {
     crossCompiler = selfPkgs.ghc.override {
       cross = targetPlatform;
@@ -105,7 +122,7 @@ in stdenv.mkDerivation (rec {
     "--enable-bootstrap-with-devel-snapshot"
   ] ++
     # fix for iOS: https://www.reddit.com/r/haskell/comments/4ttdz1/building_an_osxi386_to_iosarm64_cross_compiler/d5qvd67/
-    lib.optional (cross.config or null == "aarch64-apple-darwin14") "--disable-large-address-space";
+    stdenv.lib.optional (cross.config or null == "aarch64-apple-darwin14") "--disable-large-address-space";
 
   buildInputs = commonBuildInputs ++ [ stdenv.ccCross stdenv.binutils ];
 

pkgs/development/compilers/ghc/head.nix

@@ -1,20 +1,33 @@
-{ stdenv, lib, fetchgit, bootPkgs, perl, ncurses, libiconv, binutils, coreutils
+{ stdenv, __targetPackages
-, autoconf, automake, happy, alex, python3, buildPlatform, targetPlatform
+, buildPlatform, hostPlatform, targetPlatform
 , selfPkgs, cross ? null
 
-  # If enabled GHC will be build with the GPL-free but slower integer-simple
+# build-tools
+, bootPkgs, alex, happy
+, autoconf, automake, binutils, coreutils, fetchgit, perl, python3
+
+, libiconv ? null, ncurses
+
+, # If enabled, GHC will be build with the GPL-free but slower integer-simple
   # library instead of the faster but GPLed integer-gmp library.
-, enableIntegerSimple ? false, gmp
+  enableIntegerSimple ? false, gmp ? null
+
 , version ? "8.3.20170808"
 }:
 
+assert !enableIntegerSimple -> gmp != null;
+
 let
   inherit (bootPkgs) ghc;
 
-  commonBuildInputs = [ ghc perl autoconf automake happy alex python3 ];
-
   rev = "14457cf6a50f708eecece8f286f08687791d51f7";
 
+  # TODO(@Ericson2314) Make unconditional
+  prefix = stdenv.lib.optionalString
+    (targetPlatform != hostPlatform)
+    "${targetPlatform.config}-";
+
+  commonBuildInputs = [ ghc perl autoconf automake happy alex python3 ];
   commonPreConfigure =  ''
     echo ${version} >VERSION
     echo ${rev} >GIT_COMMIT_ID
@@ -27,7 +40,8 @@ let
   '' + stdenv.lib.optionalString enableIntegerSimple ''
     echo "INTEGER_LIBRARY=integer-simple" > mk/build.mk
   '';
-in stdenv.mkDerivation (rec {
+in
+stdenv.mkDerivation (rec {
   inherit version rev;
   name = "ghc-${version}";
 
@@ -57,15 +71,17 @@ in stdenv.mkDerivation (rec {
 
   # required, because otherwise all symbols from HSffi.o are stripped, and
   # that in turn causes GHCi to abort
-  stripDebugFlags = [ "-S" ] ++ stdenv.lib.optional (!stdenv.isDarwin) "--keep-file-symbols";
+  stripDebugFlags = [ "-S" ] ++ stdenv.lib.optional (!targetPlatform.isDarwin) "--keep-file-symbols";
 
   checkTarget = "test";
 
+  # zsh and other shells are smart about `{ghc}` but bash isn't, and doesn't
+  # treat that as a unary `{x,y,z,..}` repetition.
   postInstall = ''
-    paxmark m $out/lib/${name}/bin/{ghc,haddock}
+    paxmark m $out/lib/${name}/bin/${if targetPlatform != hostPlatform then "ghc" else "{ghc,haddock}"}
 
     # Install the bash completion file.
-    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/ghc
+    install -D -m 444 utils/completion/ghc.bash $out/share/bash-completion/completions/${prefix}ghc
 
     # Patch scripts to include "readelf" and "cat" in $PATH.
     for i in "$out/bin/"*; do
@@ -78,7 +94,7 @@ in stdenv.mkDerivation (rec {
   outputs = [ "out" "doc" ];
 
   passthru = {
-    inherit bootPkgs;
+    inherit bootPkgs prefix;
   } // stdenv.lib.optionalAttrs (targetPlatform != buildPlatform) {
     crossCompiler = selfPkgs.ghc.override {
       cross = targetPlatform;
@@ -110,7 +126,7 @@ in stdenv.mkDerivation (rec {
     "--enable-bootstrap-with-devel-snapshot"
   ] ++
     # fix for iOS: https://www.reddit.com/r/haskell/comments/4ttdz1/building_an_osxi386_to_iosarm64_cross_compiler/d5qvd67/
-    lib.optional (cross.config or null == "aarch64-apple-darwin14") "--disable-large-address-space";
+    stdenv.lib.optional (cross.config or null == "aarch64-apple-darwin14") "--disable-large-address-space";
 
   buildInputs = commonBuildInputs;