Merge pull request #26388 from obsidiansystems/tools-cleanup-rote

Tools cleanup rote

6 files changed, 192 insertions, 198 deletions

diff --git a/pkgs/development/compilers/gcc/4.5/default.nix b/pkgs/development/compilers/gcc/4.5/default.nix
index 288a91398d29..67981ad1056e 100644
--- a/pkgs/development/compilers/gcc/4.5/default.nix
+++ b/pkgs/development/compilers/gcc/4.5/default.nix
@@ -19,7 +19,6 @@
 , gnatboot ? null
 , enableMultilib ? false
 , name ? "gcc"
-, cross ? null
 , libcCross ? null
 , crossStageStatic ? true
 , gnat ? null
@@ -65,22 +64,22 @@ let version = "4.5.4";
     javaAwtGtk = langJava && gtk2 != null;
 
     /* Cross-gcc settings */
-    gccArch = stdenv.lib.attrByPath [ "gcc" "arch" ] null cross;
-    gccCpu = stdenv.lib.attrByPath [ "gcc" "cpu" ] null cross;
-    gccAbi = stdenv.lib.attrByPath [ "gcc" "abi" ] null cross;
+    gccArch = stdenv.lib.attrByPath [ "gcc" "arch" ] null targetPlatform;
+    gccCpu = stdenv.lib.attrByPath [ "gcc" "cpu" ] null targetPlatformt;
+    gccAbi = stdenv.lib.attrByPath [ "gcc" "abi" ] null targetPlatform;
     withArch = if gccArch != null then " --with-arch=${gccArch}" else "";
     withCpu = if gccCpu != null then " --with-cpu=${gccCpu}" else "";
     withAbi = if gccAbi != null then " --with-abi=${gccAbi}" else "";
-    crossMingw = (cross != null && cross.libc == "msvcrt");
+    crossMingw = (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt");
 
     crossConfigureFlags =
-      "--target=${cross.config}" +
+      "--target=${targetPlatform.config}" +
       withArch +
       withCpu +
       withAbi +
       # Ensure that -print-prog-name is able to find the correct programs.
-      " --with-as=${binutils}/bin/${cross.config}-as" +
-      " --with-ld=${binutils}/bin/${cross.config}-ld" +
+      " --with-as=${binutils}/bin/${targetPlatform.config}-as" +
+      " --with-ld=${binutils}/bin/${targetPlatform.config}-ld" +
       (if crossMingw && crossStageStatic then
         " --with-headers=${libcCross}/include" +
         " --with-gcc" +
@@ -120,7 +119,7 @@ let version = "4.5.4";
         );
     stageNameAddon = if crossStageStatic then "-stage-static" else
       "-stage-final";
-    crossNameAddon = if cross != null then "-${cross.config}" + stageNameAddon else "";
+    crossNameAddon = if targetPlatform != hostPlatform then "-${targetPlatform.config}" + stageNameAddon else "";
 
 in
 
@@ -139,7 +138,7 @@ stdenv.mkDerivation ({
 
   hardeningDisable = [ "format" ] ++ optional (name != "gnat") "all";
 
-  outputs = if (stdenv.is64bit && langAda) then [ "out" "doc" ]
+  outputs = if (hostPlatform.is64bit && langAda) then [ "out" "doc" ]
     else [ "out" "lib" "doc" ];
   setOutputFlags = false;
   NIX_NO_SELF_RPATH = true;
@@ -148,7 +147,7 @@ stdenv.mkDerivation ({
 
   patches =
     [ ]
-    ++ optional (cross != null) ../libstdc++-target.patch
+    ++ optional (targetPlatform != hostPlatform) ../libstdc++-target.patch
     ++ optional noSysDirs ./no-sys-dirs.patch
     # The GNAT Makefiles did not pay attention to CFLAGS_FOR_TARGET for its
     # target libraries and tools.
@@ -161,7 +160,7 @@ stdenv.mkDerivation ({
         || (libcCross != null                  # e.g., building `gcc.crossDrv'
             && libcCross ? crossConfig
             && libcCross.crossConfig == "i586-pc-gnu")
-        || (cross != null && cross.config == "i586-pc-gnu"
+        || (targetPlatform != hostPlatform && targetPlatform.config == "i586-pc-gnu"
             && libcCross != null))
     then
       # On GNU/Hurd glibc refers to Hurd & Mach headers and libpthread is not
@@ -197,7 +196,7 @@ stdenv.mkDerivation ({
            sed -i gcc/config/t-gnu \
                -es'|NATIVE_SYSTEM_HEADER_DIR.*$|NATIVE_SYSTEM_HEADER_DIR = ${libc.dev}/include|g'
         ''
-    else if cross != null || stdenv.cc.libc != null then
+    else if targetPlatform != hostPlatform || stdenv.cc.libc != null then
       # On NixOS, use the right path to the dynamic linker instead of
       # `/lib/ld*.so'.
       let
@@ -227,7 +226,7 @@ stdenv.mkDerivation ({
     ++ (optional langJava boehmgc)
     ++ (optionals langJava [zip unzip])
     ++ (optionals javaAwtGtk ([gtk2 pkgconfig libart_lgpl] ++ xlibs))
-    ++ (optionals (cross != null) [binutils])
+    ++ (optionals (targetPlatform != hostPlatform) [binutils])
     ++ (optionals langAda [gnatboot])
     ++ (optionals langVhdl [gnat])
     ;
@@ -265,13 +264,13 @@ stdenv.mkDerivation ({
       )
     }
     ${ # Trick that should be taken out once we have a mips64el-linux not loongson2f
-      if cross == null && stdenv.system == "mips64el-linux" then "--with-arch=loongson2f" else ""}
+      if targetPlatform == hostPlatform && stdenv.system == "mips64el-linux" then "--with-arch=loongson2f" else ""}
     ${if langAda then " --enable-libada" else ""}
-    ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}
-    ${if cross != null then crossConfigureFlags else ""}
+    ${if targetPlatform == hostPlatform && targetPlatform.isi686 then "--with-arch=i686" else ""}
+    ${if targetPlatform != hostPlatform then crossConfigureFlags else ""}
   ";
 
-  targetConfig = if cross != null then cross.config else null;
+  targetConfig = if targetPlatform != hostPlatform then targetPlatform.config else null;
 
   crossAttrs = {
     AR = "${targetPlatform.config}-ar";
@@ -284,7 +283,7 @@ stdenv.mkDerivation ({
     NM_FOR_TARGET = "${targetPlatform.config}-nm";
     CXX_FOR_TARGET = "${targetPlatform.config}-g++";
     # If we are making a cross compiler, cross != null
-    NIX_CC_CROSS = if cross == null then "${stdenv.ccCross}" else "";
+    NIX_CC_CROSS = if targetPlatform == hostPlatform then "${stdenv.ccCross}" else "";
     dontStrip = true;
     configureFlags = ''
       ${if enableMultilib then "" else "--disable-multilib"}
@@ -312,8 +311,8 @@ stdenv.mkDerivation ({
         )
       }
       ${if langAda then " --enable-libada" else ""}
-      ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}
-      ${if cross != null then crossConfigureFlags else ""}
+      ${if targetplatform == hostPlatform && targetPlatform.isi686 then "--with-arch=i686" else ""}
+      ${if targetPlatform != hostPlatform then crossConfigureFlags else ""}
       --target=${targetPlatform.config}
     '';
   };
@@ -357,7 +356,7 @@ stdenv.mkDerivation ({
     ++ optional (libpthread != null) libpthread);
 
   EXTRA_TARGET_CFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-idirafter ${libcCross.dev}/include"
       ]
       ++ optionals (! crossStageStatic) [
@@ -366,7 +365,7 @@ stdenv.mkDerivation ({
     else null;
 
   EXTRA_TARGET_LDFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-Wl,-L${libcCross.out}/lib"
       ]
       ++ (if crossStageStatic then [
@@ -412,14 +411,14 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (cross != null || libcCross != null) {
+// optionalAttrs (targetPlatform != hostPlatform || libcCross != null) {
   # `builder.sh' sets $CPP, which leads configure to use "gcc -E" instead of,
   # say, "i586-pc-gnu-gcc -E" when building `gcc.crossDrv'.
   # FIXME: Fix `builder.sh' directly in the next stdenv-update.
   postUnpack = "unset CPP";
 }
 
-// optionalAttrs (cross != null && cross.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
diff --git a/pkgs/development/compilers/gcc/4.8/default.nix b/pkgs/development/compilers/gcc/4.8/default.nix
index ee013809faf8..de9d3165b55e 100644
--- a/pkgs/development/compilers/gcc/4.8/default.nix
+++ b/pkgs/development/compilers/gcc/4.8/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, noSysDirs
 , langC ? true, langCC ? true, langFortran ? false
-, langObjC ? stdenv.isDarwin
-, langObjCpp ? stdenv.isDarwin
+, langObjC ? targetPlatform.isDarwin
+, langObjCpp ? targetPlatform.isDarwin
 , langJava ? false
 , langAda ? false
 , langVhdl ? false
@@ -25,7 +25,6 @@
 , enableMultilib ? false
 , enablePlugin ? true             # whether to support user-supplied plug-ins
 , name ? "gcc"
-, cross ? null
 , libcCross ? null
 , crossStageStatic ? true
 , gnat ? null
@@ -49,7 +48,7 @@ assert cloog != null -> isl != null;
 assert libelf != null -> zlib != null;
 
 # Make sure we get GNU sed.
-assert stdenv.isDarwin -> gnused != null;
+assert hostPlatform.isDarwin -> gnused != null;
 
 # The go frontend is written in c++
 assert langGo -> langCC;
@@ -60,19 +59,19 @@ with builtins;
 let version = "4.8.5";
 
     # Whether building a cross-compiler for GNU/Hurd.
-    crossGNU = cross != null && cross.config == "i586-pc-gnu";
+    crossGNU = targetPlatform != hostPlatform && targetPlatform.config == "i586-pc-gnu";
 
     enableParallelBuilding = true;
 
     patches = [ ]
       ++ optional enableParallelBuilding ../parallel-bconfig.patch
-      ++ optional (cross != null) ../libstdc++-target.patch
+      ++ optional (targetPlatform != hostPlatform) ../libstdc++-target.patch
       ++ optional noSysDirs ../no-sys-dirs.patch
       # The GNAT Makefiles did not pay attention to CFLAGS_FOR_TARGET for its
       # target libraries and tools.
       ++ optional langAda ../gnat-cflags.patch
       ++ optional langFortran ../gfortran-driving.patch
-      ++ optional stdenv.isDarwin ../gfortran-darwin-NXConstStr.patch;
+      ++ optional hostPlatform.isDarwin ../gfortran-darwin-NXConstStr.patch;
 
     javaEcj = fetchurl {
       # The `$(top_srcdir)/ecj.jar' file is automatically picked up at
@@ -120,8 +119,8 @@ let version = "4.8.5";
         withMode;
 
     /* Cross-gcc settings */
-    crossMingw = cross != null && cross.libc == "msvcrt";
-    crossDarwin = cross != null && cross.libc == "libSystem";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossDarwin = targetPlatform != hostPlatform && targetPlatform.libc == "libSystem";
     crossConfigureFlags = let
         gccArch = targetPlatform.gcc.arch or null;
         gccCpu = targetPlatform.gcc.cpu or null;
@@ -136,7 +135,7 @@ let version = "4.8.5";
         withFloat = if gccFloat != null then " --with-float=${gccFloat}" else "";
         withMode = if gccMode != null then " --with-mode=${gccMode}" else "";
       in
-        "--target=${cross.config}" +
+        "--target=${targetPlatform.config}" +
         withArch +
         withCpu +
         withAbi +
@@ -144,8 +143,8 @@ let version = "4.8.5";
         withFloat +
         withMode +
         # Ensure that -print-prog-name is able to find the correct programs.
-        " --with-as=${binutils}/bin/${cross.config}-as" +
-        " --with-ld=${binutils}/bin/${cross.config}-ld" +
+        " --with-as=${binutils}/bin/${targetPlatform.config}-as" +
+        " --with-ld=${binutils}/bin/${targetPlatform.config}-ld" +
         (if crossMingw && crossStageStatic then
           " --with-headers=${libcCross}/include" +
           " --with-gcc" +
@@ -187,7 +186,7 @@ let version = "4.8.5";
             " --disable-shared" +
             # To keep ABI compatibility with upstream mingw-w64
             " --enable-fully-dynamic-string"
-            else (if cross.libc == "uclibc" then
+            else (if targetPlatform.libc == "uclibc" then
               # In uclibc cases, libgomp needs an additional '-ldl'
               # and as I don't know how to pass it, I disable libgomp.
               " --disable-libgomp" else "") +
@@ -196,9 +195,9 @@ let version = "4.8.5";
             " --disable-decimal-float") # No final libdecnumber (it may work only in 386)
           );
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
-    crossNameAddon = if cross != null then "-${cross.config}" + stageNameAddon else "";
+    crossNameAddon = if targetPlatform != hostPlatform then "-${targetPlatform.config}" + stageNameAddon else "";
 
-    bootstrap = cross == null && !stdenv.isArm && !stdenv.isMips;
+    bootstrap = targetPlatform == hostPlatform && !hostPlatform.isArm && !hostPlatform.isMips;
 
 in
 
@@ -226,7 +225,7 @@ stdenv.mkDerivation ({
   libc_dev = stdenv.cc.libc_dev;
 
   postPatch =
-    if (stdenv.isHurd
+    if (hostPlatform.isHurd
         || (libcCross != null                  # e.g., building `gcc.crossDrv'
             && libcCross ? crossConfig
             && libcCross.crossConfig == "i586-pc-gnu")
@@ -262,7 +261,7 @@ stdenv.mkDerivation ({
            sed -i "${gnu_h}" \
                -es'|#define STANDARD_INCLUDE_DIR.*$|#define STANDARD_INCLUDE_DIR "${libc.dev}/include"|g'
         ''
-    else if cross != null || stdenv.cc.libc != null then
+    else if targetPlatform != hostPlatform || stdenv.cc.libc != null then
       # On NixOS, use the right path to the dynamic linker instead of
       # `/lib/ld*.so'.
       let
@@ -292,17 +291,17 @@ stdenv.mkDerivation ({
     ++ (optional (zlib != null) zlib)
     ++ (optionals langJava [ boehmgc zip unzip ])
     ++ (optionals javaAwtGtk ([ gtk2 libart_lgpl ] ++ xlibs))
-    ++ (optionals (cross != null) [binutils])
+    ++ (optionals (targetPlatform != hostPlatform) [binutils])
     ++ (optionals langAda [gnatboot])
     ++ (optionals langVhdl [gnat])
 
     # The builder relies on GNU sed (for instance, Darwin's `sed' fails with
     # "-i may not be used with stdin"), and `stdenvNative' doesn't provide it.
-    ++ (optional stdenv.isDarwin gnused)
+    ++ (optional hostPlatform.isDarwin gnused)
     ;
 
 
-  preConfigure = stdenv.lib.optionalString (stdenv.isSunOS && stdenv.is64bit) ''
+  preConfigure = stdenv.lib.optionalString (hostPlatform.isSunOS && hostPlatform.is64bit) ''
     export NIX_LDFLAGS=`echo $NIX_LDFLAGS | sed -e s~$prefix/lib~$prefix/lib/amd64~g`
     export LDFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $LDFLAGS_FOR_TARGET"
     export CXXFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $CXXFLAGS_FOR_TARGET"
@@ -312,7 +311,7 @@ stdenv.mkDerivation ({
   dontDisableStatic = true;
 
   configureFlags = "
-    ${if stdenv.isSunOS then
+    ${if hostPlatform.isSunOS then
       " --enable-long-long --enable-libssp --enable-threads=posix --disable-nls --enable-__cxa_atexit " +
       # On Illumos/Solaris GNU as is preferred
       " --with-gnu-as --without-gnu-ld "
@@ -357,19 +356,19 @@ stdenv.mkDerivation ({
         )
       )
     }
-    ${if cross == null
-      then if stdenv.isDarwin
+    ${if targetPlatform == hostPlatform
+      then if hostPlatform.isDarwin
         then " --with-native-system-header-dir=${darwin.usr-include}"
         else " --with-native-system-header-dir=${getDev stdenv.cc.libc}/include"
       else ""}
     ${if langAda then " --enable-libada" else ""}
-    ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}
-    ${if cross != null then crossConfigureFlags else ""}
+    ${if targetPlatform == hostPlatform && targetPlatform.isi686 then "--with-arch=i686" else ""}
+    ${if targetPlatform != hostPlatform then crossConfigureFlags else ""}
     ${if !bootstrap then "--disable-bootstrap" else ""}
-    ${if cross == null then platformFlags else ""}
+    ${if targetPlatform == hostPlatform then platformFlags else ""}
   ";
 
-  targetConfig = if cross != null then cross.config else null;
+  targetConfig = if targetPlatform != hostPlatform then targetPlatform.config else null;
 
   buildFlags = if bootstrap then
     (if profiledCompiler then "profiledbootstrap" else "bootstrap")
@@ -402,7 +401,7 @@ stdenv.mkDerivation ({
     NM_FOR_TARGET = "${targetPlatform.config}-nm";
     CXX_FOR_TARGET = "${targetPlatform.config}-g++";
     # If we are making a cross compiler, cross != null
-    NIX_CC_CROSS = if cross == null then "${stdenv.ccCross}" else "";
+    NIX_CC_CROSS = if targetPlatform == hostPlatform then "${stdenv.ccCross}" else "";
     dontStrip = true;
     configureFlags = ''
       ${if enableMultilib then "" else "--disable-multilib"}
@@ -479,7 +478,7 @@ stdenv.mkDerivation ({
     ++ optional (libpthread != null) libpthread);
 
   EXTRA_TARGET_CFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-idirafter ${libcCross.dev}/include"
       ]
       ++ optionals (! crossStageStatic) [
@@ -488,7 +487,7 @@ stdenv.mkDerivation ({
     else null;
 
   EXTRA_TARGET_LDFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-Wl,-L${libcCross.out}/lib"
       ]
       ++ (if crossStageStatic then [
@@ -537,13 +536,13 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (cross != null && cross.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
 
-# Strip kills static libs of other archs (hence cross != null)
-// optionalAttrs (!stripped || cross != null) { dontStrip = true; }
+# Strip kills static libs of other archs (hence targetPlatform != hostPlatform)
+// optionalAttrs (!stripped || targetPlatform != hostPlatform) { dontStrip = true; }
 
 // optionalAttrs (enableMultilib) { dontMoveLib64 = true; }
 )
diff --git a/pkgs/development/compilers/gcc/4.9/default.nix b/pkgs/development/compilers/gcc/4.9/default.nix
index 872f78fcf37a..c5bebdf33003 100644
--- a/pkgs/development/compilers/gcc/4.9/default.nix
+++ b/pkgs/development/compilers/gcc/4.9/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, noSysDirs
 , langC ? true, langCC ? true, langFortran ? false
-, langObjC ? stdenv.isDarwin
-, langObjCpp ? stdenv.isDarwin
+, langObjC ? targetPlatform.isDarwin
+, langObjCpp ? targetPlatform.isDarwin
 , langJava ? false
 , langAda ? false
 , langVhdl ? false
@@ -25,7 +25,6 @@
 , enableMultilib ? false
 , enablePlugin ? true             # whether to support user-supplied plug-ins
 , name ? "gcc"
-, cross ? null
 , libcCross ? null
 , crossStageStatic ? true
 , gnat ? null
@@ -49,7 +48,7 @@ assert cloog != null -> isl != null;
 assert libelf != null -> zlib != null;
 
 # Make sure we get GNU sed.
-assert stdenv.isDarwin -> gnused != null;
+assert hostPlatform.isDarwin -> gnused != null;
 
 # The go frontend is written in c++
 assert langGo -> langCC;
@@ -60,21 +59,21 @@ with builtins;
 let version = "4.9.4";
 
     # Whether building a cross-compiler for GNU/Hurd.
-    crossGNU = cross != null && cross.config == "i586-pc-gnu";
+    crossGNU = targetPlatform != hostPlatform && targetPlatform.config == "i586-pc-gnu";
 
     enableParallelBuilding = true;
 
     patches =
       [ ../use-source-date-epoch.patch ]
       ++ optionals enableParallelBuilding [ ../parallel-bconfig.patch ./parallel-strsignal.patch ]
-      ++ optional (cross != null) ../libstdc++-target.patch
+      ++ optional (targetPlatform != hostPlatform) ../libstdc++-target.patch
       ++ optional noSysDirs ../no-sys-dirs.patch
       # The GNAT Makefiles did not pay attention to CFLAGS_FOR_TARGET for its
       # target libraries and tools.
       ++ optional langAda ../gnat-cflags.patch
       ++ optional langFortran ../gfortran-driving.patch
       # The NXConstStr.patch can be removed at 4.9.4
-      ++ optional stdenv.isDarwin ../gfortran-darwin-NXConstStr.patch;
+      ++ optional hostPlatform.isDarwin ../gfortran-darwin-NXConstStr.patch;
 
     javaEcj = fetchurl {
       # The `$(top_srcdir)/ecj.jar' file is automatically picked up at
@@ -122,8 +121,8 @@ let version = "4.9.4";
         withMode;
 
     /* Cross-gcc settings */
-    crossMingw = cross != null && cross.libc == "msvcrt";
-    crossDarwin = cross != null && cross.libc == "libSystem";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossDarwin = targetPlatform != hostPlatform && targetPlatform.libc == "libSystem";
     crossConfigureFlags = let
         gccArch = targetPlatform.gcc.arch or null;
         gccCpu = targetPlatform.gcc.cpu or null;
@@ -138,7 +137,7 @@ let version = "4.9.4";
         withFloat = if gccFloat != null then " --with-float=${gccFloat}" else "";
         withMode = if gccMode != null then " --with-mode=${gccMode}" else "";
       in
-        "--target=${cross.config}" +
+        "--target=${targetPlatform.config}" +
         withArch +
         withCpu +
         withAbi +
@@ -146,8 +145,8 @@ let version = "4.9.4";
         withFloat +
         withMode +
         # Ensure that -print-prog-name is able to find the correct programs.
-        " --with-as=${binutils}/bin/${cross.config}-as" +
-        " --with-ld=${binutils}/bin/${cross.config}-ld" +
+        " --with-as=${binutils}/bin/${targetPlatform.config}-as" +
+        " --with-ld=${binutils}/bin/${targetPlatform.config}-ld" +
         (if crossMingw && crossStageStatic then
           " --with-headers=${libcCross}/include" +
           " --with-gcc" +
@@ -187,7 +186,7 @@ let version = "4.9.4";
             " --disable-shared" +
             # To keep ABI compatibility with upstream mingw-w64
             " --enable-fully-dynamic-string"
-            else (if cross.libc == "uclibc" then
+            else (if targetPlatform.libc == "uclibc" then
               # libsanitizer requires netrom/netrom.h which is not
               # available in uclibc.
               " --disable-libsanitizer" +
@@ -199,9 +198,9 @@ let version = "4.9.4";
             " --disable-decimal-float") # No final libdecnumber (it may work only in 386)
           );
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
-    crossNameAddon = if cross != null then "-${cross.config}" + stageNameAddon else "";
+    crossNameAddon = if targetPlatform != hostPlatform then "-${targetPlatform.config}" + stageNameAddon else "";
 
-  bootstrap = cross == null;
+  bootstrap = targetPlatform == hostPlatform;
 
 in
 
@@ -230,7 +229,7 @@ stdenv.mkDerivation ({
   libc_dev = stdenv.cc.libc_dev;
 
   postPatch =
-    if (stdenv.isHurd
+    if (hostPlatform.isHurd
         || (libcCross != null                  # e.g., building `gcc.crossDrv'
             && libcCross ? crossConfig
             && libcCross.crossConfig == "i586-pc-gnu")
@@ -266,7 +265,7 @@ stdenv.mkDerivation ({
            sed -i "${gnu_h}" \
                -es'|#define STANDARD_INCLUDE_DIR.*$|#define STANDARD_INCLUDE_DIR "${libc.dev}/include"|g'
         ''
-    else if cross != null || stdenv.cc.libc != null then
+    else if targetPlatform != hostPlatform || stdenv.cc.libc != null then
       # On NixOS, use the right path to the dynamic linker instead of
       # `/lib/ld*.so'.
       let
@@ -296,16 +295,16 @@ stdenv.mkDerivation ({
     ++ (optional (zlib != null) zlib)
     ++ (optionals langJava [ boehmgc zip unzip ])
     ++ (optionals javaAwtGtk ([ gtk2 libart_lgpl ] ++ xlibs))
-    ++ (optionals (cross != null) [binutils])
+    ++ (optionals (targetPlatform != hostPlatform) [binutils])
     ++ (optionals langAda [gnatboot])
     ++ (optionals langVhdl [gnat])
 
     # The builder relies on GNU sed (for instance, Darwin's `sed' fails with
     # "-i may not be used with stdin"), and `stdenvNative' doesn't provide it.
-    ++ (optional stdenv.isDarwin gnused)
+    ++ (optional hostPlatform.isDarwin gnused)
     ;
 
-  preConfigure = stdenv.lib.optionalString (stdenv.isSunOS && stdenv.is64bit) ''
+  preConfigure = stdenv.lib.optionalString (hostPlatform.isSunOS && hostPlatform.is64bit) ''
     sed -i -e "s/-lrt//g" libstdc++-v3/configure
     export NIX_LDFLAGS=`echo $NIX_LDFLAGS | sed -e s~$prefix/lib~$prefix/lib/amd64~g`
     export LDFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $LDFLAGS_FOR_TARGET"
@@ -320,7 +319,7 @@ stdenv.mkDerivation ({
   dontDisableStatic = true;
 
   configureFlags = "
-    ${if stdenv.isSunOS then
+    ${if hostPlatform.isSunOS then
       " --enable-long-long --enable-libssp --enable-threads=posix --disable-nls --enable-__cxa_atexit " +
       # On Illumos/Solaris GNU as is preferred
       " --with-gnu-as --without-gnu-ld "
@@ -363,19 +362,19 @@ stdenv.mkDerivation ({
         )
       )
     }
-    ${if cross == null
-      then if stdenv.isDarwin
+    ${if targetPlatform == hostPlatform
+      then if hostPlatform.isDarwin
         then " --with-native-system-header-dir=${darwin.usr-include}"
         else " --with-native-system-header-dir=${getDev stdenv.cc.libc}/include"
       else ""}
     ${if langAda then " --enable-libada" else ""}
-    ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}
-    ${if cross != null then crossConfigureFlags else ""}
+    ${if targetPlatform == hostPlatform && targetPlatform.isi686 then "--with-arch=i686" else ""}
+    ${if targetPlatform != hostPlatform then crossConfigureFlags else ""}
     ${if !bootstrap then "--disable-bootstrap" else ""}
-    ${if cross == null then platformFlags else ""}
+    ${if targetPlatform == hostPlatform then platformFlags else ""}
   ";
 
-  targetConfig = if cross != null then cross.config else null;
+  targetConfig = if targetPlatform != hostPlatform then targetPlatform.config else null;
 
   buildFlags = if bootstrap then
     (if profiledCompiler then "profiledbootstrap" else "bootstrap")
@@ -408,7 +407,7 @@ stdenv.mkDerivation ({
     NM_FOR_TARGET = "${targetPlatform.config}-nm";
     CXX_FOR_TARGET = "${targetPlatform.config}-g++";
     # If we are making a cross compiler, cross != null
-    NIX_CC_CROSS = if cross == null then "${stdenv.ccCross}" else "";
+    NIX_CC_CROSS = if targetPlatform == hostPlatform then "${stdenv.ccCross}" else "";
     dontStrip = true;
     configureFlags = ''
       ${if enableMultilib then "" else "--disable-multilib"}
@@ -485,7 +484,7 @@ stdenv.mkDerivation ({
     ++ optional (libpthread != null) libpthread);
 
   EXTRA_TARGET_CFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-idirafter ${libcCross.dev}/include"
       ]
       ++ optionals (! crossStageStatic) [
@@ -494,7 +493,7 @@ stdenv.mkDerivation ({
     else null;
 
   EXTRA_TARGET_LDFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-Wl,-L${libcCross.out}/lib"
       ]
       ++ (if crossStageStatic then [
@@ -543,13 +542,13 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (cross != null && cross.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
 
-# Strip kills static libs of other archs (hence cross != null)
-// optionalAttrs (!stripped || cross != null) { dontStrip = true; }
+# Strip kills static libs of other archs (hence targetPlatform != hostPlatform)
+// optionalAttrs (!stripped || targetPlatform != hostPlatform) { dontStrip = true; }
 
 // optionalAttrs (enableMultilib) { dontMoveLib64 = true; }
 
diff --git a/pkgs/development/compilers/gcc/5/default.nix b/pkgs/development/compilers/gcc/5/default.nix
index 70cd08383902..b4a74300d366 100644
--- a/pkgs/development/compilers/gcc/5/default.nix
+++ b/pkgs/development/compilers/gcc/5/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, noSysDirs
 , langC ? true, langCC ? true, langFortran ? false
-, langObjC ? stdenv.isDarwin
-, langObjCpp ? stdenv.isDarwin
+, langObjC ? targetPlatform.isDarwin
+, langObjCpp ? targetPlatform.isDarwin
 , langJava ? false
 , langAda ? false
 , langVhdl ? false
@@ -25,7 +25,6 @@
 , enableMultilib ? false
 , enablePlugin ? true             # whether to support user-supplied plug-ins
 , name ? "gcc"
-, cross ? null
 , libcCross ? null
 , crossStageStatic ? true
 , gnat ? null
@@ -48,10 +47,10 @@ assert langVhdl     -> gnat != null;
 assert libelf != null -> zlib != null;
 
 # Make sure we get GNU sed.
-assert stdenv.isDarwin -> gnused != null;
+assert hostPlatform.isDarwin -> gnused != null;
 
 # Need c++filt on darwin
-assert stdenv.isDarwin -> binutils != null;
+assert hostPlatform.isDarwin -> binutils != null;
 
 # The go frontend is written in c++
 assert langGo -> langCC;
@@ -63,13 +62,13 @@ let version = "5.4.0";
     sha256 = "0fihlcy5hnksdxk0sn6bvgnyq8gfrgs8m794b1jxwd1dxinzg3b0";
 
     # Whether building a cross-compiler for GNU/Hurd.
-    crossGNU = cross != null && cross.config == "i586-pc-gnu";
+    crossGNU = targetPlatform != hostPlatform && targetPlatform.config == "i586-pc-gnu";
 
     enableParallelBuilding = true;
 
     patches =
       [ ../use-source-date-epoch.patch ]
-      ++ optional (cross != null) ../libstdc++-target.patch
+      ++ optional (targetPlatform != hostPlatform) ../libstdc++-target.patch
       ++ optional noSysDirs ../no-sys-dirs.patch
       # The GNAT Makefiles did not pay attention to CFLAGS_FOR_TARGET for its
       # target libraries and tools.
@@ -126,8 +125,8 @@ let version = "5.4.0";
         withMode;
 
     /* Cross-gcc settings */
-    crossMingw = cross != null && cross.libc == "msvcrt";
-    crossDarwin = cross != null && cross.libc == "libSystem";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossDarwin = targetPlatform != hostPlatform && targetPlatform.libc == "libSystem";
     crossConfigureFlags = let
         gccArch = targetPlatform.gcc.arch or null;
         gccCpu = targetPlatform.gcc.cpu or null;
@@ -142,7 +141,7 @@ let version = "5.4.0";
         withFloat = if gccFloat != null then " --with-float=${gccFloat}" else "";
         withMode = if gccMode != null then " --with-mode=${gccMode}" else "";
       in
-        "--target=${cross.config}" +
+        "--target=${targetPlatform.config}" +
         withArch +
         withCpu +
         withAbi +
@@ -150,8 +149,8 @@ let version = "5.4.0";
         withFloat +
         withMode +
         # Ensure that -print-prog-name is able to find the correct programs.
-        " --with-as=${binutils}/bin/${cross.config}-as" +
-        " --with-ld=${binutils}/bin/${cross.config}-ld" +
+        " --with-as=${binutils}/bin/${targetPlatform.config}-as" +
+        " --with-ld=${binutils}/bin/${targetPlatform.config}-ld" +
         (if crossMingw && crossStageStatic then
           " --with-headers=${libcCross}/include" +
           " --with-gcc" +
@@ -191,7 +190,7 @@ let version = "5.4.0";
             " --disable-shared" +
             # To keep ABI compatibility with upstream mingw-w64
             " --enable-fully-dynamic-string"
-            else (if cross.libc == "uclibc" then
+            else (if targetPlatform.libc == "uclibc" then
               # libsanitizer requires netrom/netrom.h which is not
               # available in uclibc.
               " --disable-libsanitizer" +
@@ -203,9 +202,9 @@ let version = "5.4.0";
             " --disable-decimal-float") # No final libdecnumber (it may work only in 386)
           );
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
-    crossNameAddon = if cross != null then "-${cross.config}" + stageNameAddon else "";
+    crossNameAddon = if targetPlatform != hostPlatform then "-${targetPlatform.config}" + stageNameAddon else "";
 
-  bootstrap = cross == null;
+  bootstrap = targetPlatform == hostPlatform;
 
 in
 
@@ -235,7 +234,7 @@ stdenv.mkDerivation ({
 
   # This should kill all the stdinc frameworks that gcc and friends like to
   # insert into default search paths.
-  prePatch = stdenv.lib.optionalString stdenv.isDarwin ''
+  prePatch = stdenv.lib.optionalString hostPlatform.isDarwin ''
     substituteInPlace gcc/config/darwin-c.c \
       --replace 'if (stdinc)' 'if (0)'
 
@@ -247,7 +246,7 @@ stdenv.mkDerivation ({
   '';
 
   postPatch =
-    if (stdenv.isHurd
+    if (hostPlatform.isHurd
         || (libcCross != null                  # e.g., building `gcc.crossDrv'
             && libcCross ? crossConfig
             && libcCross.crossConfig == "i586-pc-gnu")
@@ -283,7 +282,7 @@ stdenv.mkDerivation ({
            sed -i "${gnu_h}" \
                -es'|#define STANDARD_INCLUDE_DIR.*$|#define STANDARD_INCLUDE_DIR "${libc.dev}/include"|g'
         ''
-    else if cross != null || stdenv.cc.libc != null then
+    else if targetPlatform != hostPlatform || stdenv.cc.libc != null then
       # On NixOS, use the right path to the dynamic linker instead of
       # `/lib/ld*.so'.
       let
@@ -312,19 +311,19 @@ stdenv.mkDerivation ({
     ++ (optional (zlib != null) zlib)
     ++ (optionals langJava [ boehmgc zip unzip ])
     ++ (optionals javaAwtGtk ([ gtk2 libart_lgpl ] ++ xlibs))
-    ++ (optionals (cross != null) [binutils])
+    ++ (optionals (targetPlatform != hostPlatform) [binutils])
     ++ (optionals langAda [gnatboot])
     ++ (optionals langVhdl [gnat])
 
     # The builder relies on GNU sed (for instance, Darwin's `sed' fails with
     # "-i may not be used with stdin"), and `stdenvNative' doesn't provide it.
-    ++ (optional stdenv.isDarwin gnused)
-    ++ (optional stdenv.isDarwin binutils)
+    ++ (optional hostPlatform.isDarwin gnused)
+    ++ (optional hostPlatform.isDarwin binutils)
     ;
 
-  NIX_LDFLAGS = stdenv.lib.optionalString  stdenv.isSunOS "-lm -ldl";
+  NIX_LDFLAGS = stdenv.lib.optionalString  hostPlatform.isSunOS "-lm -ldl";
 
-  preConfigure = stdenv.lib.optionalString (stdenv.isSunOS && stdenv.is64bit) ''
+  preConfigure = stdenv.lib.optionalString (hostPlatform.isSunOS && hostPlatform.is64bit) ''
     export NIX_LDFLAGS=`echo $NIX_LDFLAGS | sed -e s~$prefix/lib~$prefix/lib/amd64~g`
     export LDFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $LDFLAGS_FOR_TARGET"
     export CXXFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $CXXFLAGS_FOR_TARGET"
@@ -334,7 +333,7 @@ stdenv.mkDerivation ({
   dontDisableStatic = true;
 
   configureFlags = "
-    ${if stdenv.isSunOS then
+    ${if hostPlatform.isSunOS then
       " --enable-long-long --enable-libssp --enable-threads=posix --disable-nls --enable-__cxa_atexit " +
       # On Illumos/Solaris GNU as is preferred
       " --with-gnu-as --without-gnu-ld "
@@ -378,19 +377,19 @@ stdenv.mkDerivation ({
         )
       )
     }
-    ${if cross == null
-      then if stdenv.isDarwin
+    ${if targetPlatform == hostPlatform
+      then if hostPlatform.isDarwin
         then " --with-native-system-header-dir=${darwin.usr-include}"
         else " --with-native-system-header-dir=${getDev stdenv.cc.libc}/include"
       else ""}
     ${if langAda then " --enable-libada" else ""}
-    ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}
-    ${if cross != null then crossConfigureFlags else ""}
+    ${if targetPlatform == hostPlatform && targetPlatform.isi686 then "--with-arch=i686" else ""}
+    ${if targetPlatform != hostPlatform then crossConfigureFlags else ""}
     ${if !bootstrap then "--disable-bootstrap" else ""}
-    ${if cross == null then platformFlags else ""}
+    ${if targetPlatform == hostPlatform then platformFlags else ""}
   ";
 
-  targetConfig = if cross != null then cross.config else null;
+  targetConfig = if targetPlatform != hostPlatform then targetPlatform.config else null;
 
   buildFlags = if bootstrap then
     (if profiledCompiler then "profiledbootstrap" else "bootstrap")
@@ -423,7 +422,7 @@ stdenv.mkDerivation ({
     NM_FOR_TARGET = "${targetPlatform.config}-nm";
     CXX_FOR_TARGET = "${targetPlatform.config}-g++";
     # If we are making a cross compiler, cross != null
-    NIX_CC_CROSS = if cross == null then "${stdenv.ccCross}" else "";
+    NIX_CC_CROSS = if targetPlatform == hostPlatform then "${stdenv.ccCross}" else "";
     dontStrip = true;
     configureFlags = ''
       ${if enableMultilib then "" else "--disable-multilib"}
@@ -499,7 +498,7 @@ stdenv.mkDerivation ({
     ++ optional (libpthread != null) libpthread);
 
   EXTRA_TARGET_CFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-idirafter ${getDev libcCross}/include"
       ]
       ++ optionals (! crossStageStatic) [
@@ -508,7 +507,7 @@ stdenv.mkDerivation ({
     else null;
 
   EXTRA_TARGET_LDFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-Wl,-L${libcCross.out}/lib"
       ]
       ++ (if crossStageStatic then [
@@ -556,13 +555,13 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (cross != null && cross.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
 
-# Strip kills static libs of other archs (hence cross != null)
-// optionalAttrs (!stripped || cross != null) { dontStrip = true; }
+# Strip kills static libs of other archs (hence targetPlatform != hostPlatform)
+// optionalAttrs (!stripped || targetPlatform != hostPlatform) { dontStrip = true; }
 
 // optionalAttrs (enableMultilib) { dontMoveLib64 = true; }
 )
diff --git a/pkgs/development/compilers/gcc/6/default.nix b/pkgs/development/compilers/gcc/6/default.nix
index 1a95f476adaf..057acf9794e7 100644
--- a/pkgs/development/compilers/gcc/6/default.nix
+++ b/pkgs/development/compilers/gcc/6/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, noSysDirs
 , langC ? true, langCC ? true, langFortran ? false
-, langObjC ? stdenv.isDarwin
-, langObjCpp ? stdenv.isDarwin
+, langObjC ? targetPlatform.isDarwin
+, langObjCpp ? targetPlatform.isDarwin
 , langJava ? false
 , langAda ? false
 , langVhdl ? false
@@ -25,7 +25,6 @@
 , enableMultilib ? false
 , enablePlugin ? true             # whether to support user-supplied plug-ins
 , name ? "gcc"
-, cross ? null
 , libcCross ? null
 , crossStageStatic ? true
 , gnat ? null
@@ -48,10 +47,10 @@ assert langVhdl     -> gnat != null;
 assert libelf != null -> zlib != null;
 
 # Make sure we get GNU sed.
-assert stdenv.isDarwin -> gnused != null;
+assert hostPlatform.isDarwin -> gnused != null;
 
 # Need c++filt on darwin
-assert stdenv.isDarwin -> binutils != null;
+assert hostPlatform.isDarwin -> binutils != null;
 
 # The go frontend is written in c++
 assert langGo -> langCC;
@@ -62,19 +61,19 @@ with builtins;
 let version = "6.3.0";
 
     # Whether building a cross-compiler for GNU/Hurd.
-    crossGNU = cross != null && cross.config == "i586-pc-gnu";
+    crossGNU = targetPlatform != hostPlatform && targetPlatform.config == "i586-pc-gnu";
 
     enableParallelBuilding = true;
 
     patches =
       [ ../use-source-date-epoch.patch ]
-      ++ optional (cross != null) ../libstdc++-target.patch
+      ++ optional (targetPlatform != hostPlatform) ../libstdc++-target.patch
       ++ optional noSysDirs ../no-sys-dirs.patch
       # The GNAT Makefiles did not pay attention to CFLAGS_FOR_TARGET for its
       # target libraries and tools.
       ++ optional langAda ../gnat-cflags.patch
       ++ optional langFortran ../gfortran-driving.patch
-      ++ optional stdenv.isDarwin ./darwin-const-correct.patch; # Kill this after 6.3.0
+      ++ optional hostPlatform.isDarwin ./darwin-const-correct.patch; # Kill this after 6.3.0
 
     javaEcj = fetchurl {
       # The `$(top_srcdir)/ecj.jar' file is automatically picked up at
@@ -122,8 +121,8 @@ let version = "6.3.0";
         withMode;
 
     /* Cross-gcc settings */
-    crossMingw = cross != null && cross.libc == "msvcrt";
-    crossDarwin = cross != null && cross.libc == "libSystem";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossDarwin = targetPlatform != hostPlatform && targetPlatform.libc == "libSystem";
     crossConfigureFlags = let
         gccArch = targetPlatform.gcc.arch or null;
         gccCpu = targetPlatform.gcc.cpu or null;
@@ -138,7 +137,7 @@ let version = "6.3.0";
         withFloat = if gccFloat != null then " --with-float=${gccFloat}" else "";
         withMode = if gccMode != null then " --with-mode=${gccMode}" else "";
       in
-        "--target=${cross.config}" +
+        "--target=${targetPlatform.config}" +
         withArch +
         withCpu +
         withAbi +
@@ -146,8 +145,8 @@ let version = "6.3.0";
         withFloat +
         withMode +
         # Ensure that -print-prog-name is able to find the correct programs.
-        " --with-as=${binutils}/bin/${cross.config}-as" +
-        " --with-ld=${binutils}/bin/${cross.config}-ld" +
+        " --with-as=${binutils}/bin/${targetPlatform.config}-as" +
+        " --with-ld=${binutils}/bin/${targetPlatform.config}-ld" +
         (if crossMingw && crossStageStatic then
           " --with-headers=${libcCross}/include" +
           " --with-gcc" +
@@ -187,7 +186,7 @@ let version = "6.3.0";
             " --disable-shared" +
             # To keep ABI compatibility with upstream mingw-w64
             " --enable-fully-dynamic-string"
-            else (if cross.libc == "uclibc" then
+            else (if targetPlatform.libc == "uclibc" then
               # libsanitizer requires netrom/netrom.h which is not
               # available in uclibc.
               " --disable-libsanitizer" +
@@ -199,9 +198,9 @@ let version = "6.3.0";
             " --disable-decimal-float") # No final libdecnumber (it may work only in 386)
           );
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
-    crossNameAddon = if cross != null then "-${cross.config}" + stageNameAddon else "";
+    crossNameAddon = if targetPlatform != hostPlatform then "-${targetPlatform.config}" + stageNameAddon else "";
 
-  bootstrap = cross == null;
+  bootstrap = targetPlatform == hostPlatform;
 
 in
 
@@ -229,7 +228,7 @@ stdenv.mkDerivation ({
   hardeningDisable = [ "format" ];
 
   postPatch =
-    if (stdenv.isHurd
+    if (hostPlatform.isHurd
         || (libcCross != null                  # e.g., building `gcc.crossDrv'
             && libcCross ? crossConfig
             && libcCross.crossConfig == "i586-pc-gnu")
@@ -265,7 +264,7 @@ stdenv.mkDerivation ({
            sed -i "${gnu_h}" \
                -es'|#define STANDARD_INCLUDE_DIR.*$|#define STANDARD_INCLUDE_DIR "${libc.dev}/include"|g'
         ''
-    else if cross != null || stdenv.cc.libc != null then
+    else if targetPlatform != hostPlatform || stdenv.cc.libc != null then
       # On NixOS, use the right path to the dynamic linker instead of
       # `/lib/ld*.so'.
       let
@@ -294,19 +293,19 @@ stdenv.mkDerivation ({
     ++ (optional (zlib != null) zlib)
     ++ (optionals langJava [ boehmgc zip unzip ])
     ++ (optionals javaAwtGtk ([ gtk2 libart_lgpl ] ++ xlibs))
-    ++ (optionals (cross != null) [binutils])
+    ++ (optionals (targetPlatform != hostPlatform) [binutils])
     ++ (optionals langAda [gnatboot])
     ++ (optionals langVhdl [gnat])
 
     # The builder relies on GNU sed (for instance, Darwin's `sed' fails with
     # "-i may not be used with stdin"), and `stdenvNative' doesn't provide it.
-    ++ (optional stdenv.isDarwin gnused)
-    ++ (optional stdenv.isDarwin binutils)
+    ++ (optional hostPlatform.isDarwin gnused)
+    ++ (optional hostPlatform.isDarwin binutils)
     ;
 
-  NIX_LDFLAGS = stdenv.lib.optionalString  stdenv.isSunOS "-lm -ldl";
+  NIX_LDFLAGS = stdenv.lib.optionalString  hostPlatform.isSunOS "-lm -ldl";
 
-  preConfigure = stdenv.lib.optionalString (stdenv.isSunOS && stdenv.is64bit) ''
+  preConfigure = stdenv.lib.optionalString (hostPlatform.isSunOS && hostPlatform.is64bit) ''
     export NIX_LDFLAGS=`echo $NIX_LDFLAGS | sed -e s~$prefix/lib~$prefix/lib/amd64~g`
     export LDFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $LDFLAGS_FOR_TARGET"
     export CXXFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $CXXFLAGS_FOR_TARGET"
@@ -316,7 +315,7 @@ stdenv.mkDerivation ({
   dontDisableStatic = true;
 
   configureFlags = "
-    ${if stdenv.isSunOS then
+    ${if hostPlatform.isSunOS then
       " --enable-long-long --enable-libssp --enable-threads=posix --disable-nls --enable-__cxa_atexit " +
       # On Illumos/Solaris GNU as is preferred
       " --with-gnu-as --without-gnu-ld "
@@ -360,19 +359,19 @@ stdenv.mkDerivation ({
         )
       )
     }
-    ${if cross == null
-      then if stdenv.isDarwin
+    ${if targetPlatform == hostPlatform
+      then if hostPlatform.isDarwin
         then " --with-native-system-header-dir=${darwin.usr-include}"
         else " --with-native-system-header-dir=${getDev stdenv.cc.libc}/include"
       else ""}
     ${if langAda then " --enable-libada" else ""}
-    ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}
-    ${if cross != null then crossConfigureFlags else ""}
+    ${if targetPlatform == hostPlatform && targetPlatform.isi686 then "--with-arch=i686" else ""}
+    ${if targetPlatform != hostPlatform then crossConfigureFlags else ""}
     ${if !bootstrap then "--disable-bootstrap" else ""}
-    ${if cross == null then platformFlags else ""}
+    ${if targetPlatform == hostPlatform then platformFlags else ""}
   ";
 
-  targetConfig = if cross != null then cross.config else null;
+  targetConfig = if targetPlatform != hostPlatform then targetPlatform.config else null;
 
   buildFlags = if bootstrap then
     (if profiledCompiler then "profiledbootstrap" else "bootstrap")
@@ -405,7 +404,7 @@ stdenv.mkDerivation ({
     NM_FOR_TARGET = "${targetPlatform.config}-nm";
     CXX_FOR_TARGET = "${targetPlatform.config}-g++";
     # If we are making a cross compiler, cross != null
-    NIX_CC_CROSS = if cross == null then "${stdenv.ccCross}" else "";
+    NIX_CC_CROSS = if targetPlatform == hostPlatform then "${stdenv.ccCross}" else "";
     dontStrip = true;
     configureFlags = ''
       ${if enableMultilib then "" else "--disable-multilib"}
@@ -481,7 +480,7 @@ stdenv.mkDerivation ({
     ++ optional (libpthread != null) libpthread);
 
   EXTRA_TARGET_CFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-idirafter ${getDev libcCross}/include"
       ]
       ++ optionals (! crossStageStatic) [
@@ -490,7 +489,7 @@ stdenv.mkDerivation ({
     else null;
 
   EXTRA_TARGET_LDFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-Wl,-L${libcCross.out}/lib"
       ]
       ++ (if crossStageStatic then [
@@ -538,13 +537,13 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (cross != null && cross.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
 
-# Strip kills static libs of other archs (hence cross != null)
-// optionalAttrs (!stripped || cross != null) { dontStrip = true; }
+# Strip kills static libs of other archs (hence targetPlatform != hostPlatform)
+// optionalAttrs (!stripped || targetPlatform != hostPlatform) { dontStrip = true; }
 
 // optionalAttrs (enableMultilib) { dontMoveLib64 = true; }
 )
diff --git a/pkgs/development/compilers/gcc/snapshot/default.nix b/pkgs/development/compilers/gcc/snapshot/default.nix
index cbb373eb3eda..bb2c9d8a5c09 100644
--- a/pkgs/development/compilers/gcc/snapshot/default.nix
+++ b/pkgs/development/compilers/gcc/snapshot/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, noSysDirs
 , langC ? true, langCC ? true, langFortran ? false
-, langObjC ? stdenv.isDarwin
-, langObjCpp ? stdenv.isDarwin
+, langObjC ? targetPlatform.isDarwin
+, langObjCpp ? targetPlatform.isDarwin
 , langJava ? false
 , langAda ? false
 , langVhdl ? false
@@ -25,7 +25,6 @@
 , enableMultilib ? false
 , enablePlugin ? true             # whether to support user-supplied plug-ins
 , name ? "gcc"
-, cross ? null
 , libcCross ? null
 , crossStageStatic ? true
 , gnat ? null
@@ -49,10 +48,10 @@ assert langVhdl     -> gnat != null;
 assert libelf != null -> zlib != null;
 
 # Make sure we get GNU sed.
-assert stdenv.isDarwin -> gnused != null;
+assert hostPlatform.isDarwin -> gnused != null;
 
 # Need c++filt on darwin
-assert stdenv.isDarwin -> binutils != null;
+assert hostPlatform.isDarwin -> binutils != null;
 
 # The go frontend is written in c++
 assert langGo -> langCC;
@@ -63,13 +62,13 @@ with builtins;
 let version = "7-20170409";
 
     # Whether building a cross-compiler for GNU/Hurd.
-    crossGNU = cross != null && cross.config == "i586-pc-gnu";
+    crossGNU = targetPlatform != hostPlatform && targetPlatform.config == "i586-pc-gnu";
 
     enableParallelBuilding = true;
 
     patches =
       [ ]
-      ++ optional (cross != null) ../libstdc++-target.patch
+      ++ optional (targetPlatform != hostPlatform) ../libstdc++-target.patch
       ++ optional noSysDirs ../no-sys-dirs.patch
       # The GNAT Makefiles did not pay attention to CFLAGS_FOR_TARGET for its
       # target libraries and tools.
@@ -122,8 +121,8 @@ let version = "7-20170409";
         withMode;
 
     /* Cross-gcc settings */
-    crossMingw = cross != null && cross.libc == "msvcrt";
-    crossDarwin = cross != null && cross.libc == "libSystem";
+    crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
+    crossDarwin = targetPlatform != hostPlatform && targetPlatform.libc == "libSystem";
     crossConfigureFlags = let
         gccArch = targetPlatform.gcc.arch or null;
         gccCpu = targetPlatform.gcc.cpu or null;
@@ -138,7 +137,7 @@ let version = "7-20170409";
         withFloat = if gccFloat != null then " --with-float=${gccFloat}" else "";
         withMode = if gccMode != null then " --with-mode=${gccMode}" else "";
       in
-        "--target=${cross.config}" +
+        "--target=${targetPlatform.config}" +
         withArch +
         withCpu +
         withAbi +
@@ -146,8 +145,8 @@ let version = "7-20170409";
         withFloat +
         withMode +
         # Ensure that -print-prog-name is able to find the correct programs.
-        " --with-as=${binutils}/bin/${cross.config}-as" +
-        " --with-ld=${binutils}/bin/${cross.config}-ld" +
+        " --with-as=${binutils}/bin/${targetPlatform.config}-as" +
+        " --with-ld=${binutils}/bin/${targetPlatform.config}-ld" +
         (if crossMingw && crossStageStatic then
           " --with-headers=${libcCross}/include" +
           " --with-gcc" +
@@ -188,7 +187,7 @@ let version = "7-20170409";
             " --disable-shared" +
             # To keep ABI compatibility with upstream mingw-w64
             " --enable-fully-dynamic-string"
-            else (if cross.libc == "uclibc" then
+            else (if targetPlatform.libc == "uclibc" then
               # libsanitizer requires netrom/netrom.h which is not
               # available in uclibc.
               " --disable-libsanitizer" +
@@ -200,9 +199,9 @@ let version = "7-20170409";
             " --disable-decimal-float") # No final libdecnumber (it may work only in 386)
           );
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
-    crossNameAddon = if cross != null then "-${cross.config}" + stageNameAddon else "";
+    crossNameAddon = if targetPlatform != hostPlatform then "-${targetPlatform.config}" + stageNameAddon else "";
 
-  bootstrap = cross == null;
+  bootstrap = targetPlatform == hostPlatform;
 
 in
 
@@ -230,7 +229,7 @@ stdenv.mkDerivation ({
   hardeningDisable = [ "format" ];
 
   postPatch =
-    if (stdenv.isHurd
+    if (hostPlatform.isHurd
         || (libcCross != null                  # e.g., building `gcc.crossDrv'
             && libcCross ? crossConfig
             && libcCross.crossConfig == "i586-pc-gnu")
@@ -266,7 +265,7 @@ stdenv.mkDerivation ({
            sed -i "${gnu_h}" \
                -es'|#define STANDARD_INCLUDE_DIR.*$|#define STANDARD_INCLUDE_DIR "${libc.dev}/include"|g'
         ''
-    else if cross != null || stdenv.cc.libc != null then
+    else if targetPlatform != hostPlatform || stdenv.cc.libc != null then
       # On NixOS, use the right path to the dynamic linker instead of
       # `/lib/ld*.so'.
       let
@@ -295,19 +294,19 @@ stdenv.mkDerivation ({
     ++ (optional (zlib != null) zlib)
     ++ (optionals langJava [ boehmgc zip unzip ])
     ++ (optionals javaAwtGtk ([ gtk2 libart_lgpl ] ++ xlibs))
-    ++ (optionals (cross != null) [binutils])
+    ++ (optionals (targetPlatform != hostPlatform) [binutils])
     ++ (optionals langAda [gnatboot])
     ++ (optionals langVhdl [gnat])
 
     # The builder relies on GNU sed (for instance, Darwin's `sed' fails with
     # "-i may not be used with stdin"), and `stdenvNative' doesn't provide it.
-    ++ (optional stdenv.isDarwin gnused)
-    ++ (optional stdenv.isDarwin binutils)
+    ++ (optional hostPlatform.isDarwin gnused)
+    ++ (optional hostPlatform.isDarwin binutils)
     ;
 
-  NIX_LDFLAGS = stdenv.lib.optionalString  stdenv.isSunOS "-lm -ldl";
+  NIX_LDFLAGS = stdenv.lib.optionalString  hostPlatform.isSunOS "-lm -ldl";
 
-  preConfigure = stdenv.lib.optionalString (stdenv.isSunOS && stdenv.is64bit) ''
+  preConfigure = stdenv.lib.optionalString (hostPlatform.isSunOS && hostPlatform.is64bit) ''
     export NIX_LDFLAGS=`echo $NIX_LDFLAGS | sed -e s~$prefix/lib~$prefix/lib/amd64~g`
     export LDFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $LDFLAGS_FOR_TARGET"
     export CXXFLAGS_FOR_TARGET="-Wl,-rpath,$prefix/lib/amd64 $CXXFLAGS_FOR_TARGET"
@@ -317,7 +316,7 @@ stdenv.mkDerivation ({
   dontDisableStatic = true;
 
   configureFlags = "
-    ${if stdenv.isSunOS then
+    ${if hostPlatform.isSunOS then
       " --enable-long-long --enable-libssp --enable-threads=posix --disable-nls --enable-__cxa_atexit " +
       # On Illumos/Solaris GNU as is preferred
       " --with-gnu-as --without-gnu-ld "
@@ -361,19 +360,19 @@ stdenv.mkDerivation ({
         )
       )
     }
-    ${if cross == null
-      then if stdenv.isDarwin
+    ${if targetPlatform == hostPlatform
+      then if hostPlatform.isDarwin
         then " --with-native-system-header-dir=${darwin.usr-include}"
         else " --with-native-system-header-dir=${getDev stdenv.cc.libc}/include"
       else ""}
     ${if langAda then " --enable-libada" else ""}
-    ${if cross == null && stdenv.isi686 then "--with-arch=i686" else ""}
-    ${if cross != null then crossConfigureFlags else ""}
+    ${if targetPlatform == hostPlatform && targetPlatform.isi686 then "--with-arch=i686" else ""}
+    ${if targetPlatform != hostPlatform then crossConfigureFlags else ""}
     ${if !bootstrap then "--disable-bootstrap" else ""}
-    ${if cross == null then platformFlags else ""}
+    ${if targetPlatform == hostPlatform then platformFlags else ""}
   ";
 
-  targetConfig = if cross != null then cross.config else null;
+  targetConfig = if targetPlatform != hostPlatform then targetPlatform.config else null;
 
   buildFlags = if bootstrap then
     (if profiledCompiler then "profiledbootstrap" else "bootstrap")
@@ -406,7 +405,7 @@ stdenv.mkDerivation ({
     NM_FOR_TARGET = "${targetPlatform.config}-nm";
     CXX_FOR_TARGET = "${targetPlatform.config}-g++";
     # If we are making a cross compiler, cross != null
-    NIX_CC_CROSS = if cross == null then "${stdenv.ccCross}" else "";
+    NIX_CC_CROSS = if targetPlatform == hostPlatform then "${stdenv.ccCross}" else "";
     dontStrip = true;
     configureFlags = ''
       ${if enableMultilib then "" else "--disable-multilib"}
@@ -482,7 +481,7 @@ stdenv.mkDerivation ({
     ++ optional (libpthread != null) libpthread);
 
   EXTRA_TARGET_CFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-idirafter ${getDev libcCross}/include"
       ]
       ++ optionals (! crossStageStatic) [
@@ -491,7 +490,7 @@ stdenv.mkDerivation ({
     else null;
 
   EXTRA_TARGET_LDFLAGS =
-    if cross != null && libcCross != null then [
+    if targetPlatform != hostPlatform && libcCross != null then [
         "-Wl,-L${libcCross.out}/lib"
       ]
       ++ (if crossStageStatic then [
@@ -539,13 +538,13 @@ stdenv.mkDerivation ({
   };
 }
 
-// optionalAttrs (cross != null && cross.libc == "msvcrt" && crossStageStatic) {
+// optionalAttrs (targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt" && crossStageStatic) {
   makeFlags = [ "all-gcc" "all-target-libgcc" ];
   installTargets = "install-gcc install-target-libgcc";
 }
 
-# Strip kills static libs of other archs (hence cross != null)
-// optionalAttrs (!stripped || cross != null) { dontStrip = true; NIX_STRIP_DEBUG = 0; }
+# Strip kills static libs of other archs (hence targetPlatform != hostPlatform)
+// optionalAttrs (!stripped || targetPlatform != hostPlatform) { dontStrip = true; NIX_STRIP_DEBUG = 0; }
 
 // optionalAttrs (enableMultilib) { dontMoveLib64 = true; }
 )