Merge some merged cross-compilation PRs into into staging

9 files changed, 161 insertions, 649 deletions

diff --git a/pkgs/build-support/cc-wrapper/default.nix b/pkgs/build-support/cc-wrapper/default.nix
index e56f1f9a7d4a..0c624a1454a3 100644
--- a/pkgs/build-support/cc-wrapper/default.nix
+++ b/pkgs/build-support/cc-wrapper/default.nix
@@ -5,11 +5,13 @@
 # script that sets up the right environment variables so that the
 # compiler and the linker just "work".
 
-{ name ? "", stdenv, nativeTools, nativeLibc, nativePrefix ? ""
+{ name ? "", stdenv, nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
 , cc ? null, libc ? null, binutils ? null, coreutils ? null, shell ? stdenv.shell
 , zlib ? null, extraPackages ? [], extraBuildCommands ? ""
 , dyld ? null # TODO: should this be a setup-hook on dyld?
 , isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
+, hostPlatform, targetPlatform
+, runCommand ? null
 }:
 
 with stdenv.lib;
@@ -17,32 +19,113 @@ with stdenv.lib;
 assert nativeTools -> nativePrefix != "";
 assert !nativeTools ->
   cc != null && binutils != null && coreutils != null && gnugrep != null;
-assert !nativeLibc -> libc != null;
+assert !(nativeLibc && noLibc);
+assert (noLibc || nativeLibc) == (libc == null);
+
+assert targetPlatform != hostPlatform -> runCommand != null;
 
 # For ghdl (the vhdl language provider to gcc) we need zlib in the wrapper.
 assert cc.langVhdl or false -> zlib != null;
 
 let
+  # Prefix for binaries. Customarily ends with a dash separator.
+  #
+  # TODO(@Ericson2314) Make unconditional, or optional but always true by
+  # default.
+  prefix = stdenv.lib.optionalString (targetPlatform != hostPlatform)
+                                     (targetPlatform.config + "-");
 
   ccVersion = (builtins.parseDrvName cc.name).version;
   ccName = (builtins.parseDrvName cc.name).name;
 
-  libc_bin = if nativeLibc then null else getBin libc;
-  libc_dev = if nativeLibc then null else getDev libc;
-  libc_lib = if nativeLibc then null else getLib libc;
+  libc_bin = if libc == null then null else getBin libc;
+  libc_dev = if libc == null then null else getDev libc;
+  libc_lib = if libc == null then null else getLib libc;
   cc_solib = getLib cc;
   binutils_bin = if nativeTools then "" else getBin binutils;
   # The wrapper scripts use 'cat' and 'grep', so we may need coreutils.
   coreutils_bin = if nativeTools then "" else getBin coreutils;
 
-  default_cxx_stdlib_compile=optionalString (stdenv.isLinux && !(cc.isGNU or false))
+  default_cxx_stdlib_compile=optionalString (targetPlatform.isLinux && !(cc.isGNU or false))
     "-isystem $(echo -n ${cc.gcc}/include/c++/*) -isystem $(echo -n ${cc.gcc}/include/c++/*)/$(${cc.gcc}/bin/gcc -dumpmachine)";
+
+  dashlessTarget = stdenv.lib.replaceStrings ["-"] ["_"] targetPlatform.config;
+  # TODO(@Ericson2314) Make unconditional
+  infixSalt  = stdenv.lib.optionalString (targetPlatform != hostPlatform) dashlessTarget;
+  infixSalt_ = stdenv.lib.optionalString (targetPlatform != hostPlatform) (dashlessTarget + "_");
+  _infixSalt = stdenv.lib.optionalString (targetPlatform != hostPlatform) ("_" + dashlessTarget);
+
+  # We want to prefix all NIX_ flags with the target triple
+  preWrap = textFile:
+    # TODO: Do even when not cross on next mass-rebuild
+    # TODO: use @target_tripple@ for consistency
+    if targetPlatform == hostPlatform
+    then textFile
+    else runCommand "sed-nix-env-vars" {} (''
+      cp --no-preserve=mode ${textFile} $out
+
+      sed -i $out \
+        -e 's^NIX_^NIX_${infixSalt_}^g' \
+        -e 's^addCVars^addCVars${_infixSalt}^g' \
+        -e 's^\[ -z "\$crossConfig" \]^\[\[ "${builtins.toString (targetPlatform != hostPlatform)}" || -z "$crossConfig" \]\]^g'
+
+    '' + stdenv.lib.optionalString (textFile == ./setup-hook.sh) ''
+      cat << 'EOF' >> $out
+        for CMD in ar as nm objcopy ranlib strip strings size ld
+        do
+          # which is not part of stdenv, but compgen will do for now
+          if
+            PATH=$_PATH type -p ${prefix}$CMD > /dev/null
+          then
+            export ''$(echo "$CMD" | tr "[:lower:]" "[:upper:]")=${prefix}''${CMD};
+          fi
+        done
+      EOF
+
+      sed -i $out -e 's_envHooks_crossEnvHooks_g'
+    '' + ''
+
+      # NIX_ things which we don't both use and define, we revert them
+      #asymmetric=$(
+      #  for pre in "" "\\$"
+      #  do
+      #    grep -E -ho $pre'NIX_[a-zA-Z_]*' ./* | sed 's/\$//' | sort | uniq
+      #  done | sort | uniq -c | sort -nr | sed -n 's/^1 NIX_//gp')
+
+      # hard-code for now
+      asymmetric=("CXXSTDLIB_COMPILE" "CC")
+
+      # The ([^a-zA-Z_]|$) bussiness is to ensure environment variables that
+      # begin with `NIX_CC` don't also get blacklisted.
+      for var in "''${asymmetric[@]}"
+      do
+        sed -i $out -E -e "s~NIX_${infixSalt_}$var([^a-zA-Z_]|$)~NIX_$var\1~g"
+      done
+    '');
+
+  # The dynamic linker has different names on different platforms.
+  dynamicLinker =
+    if !nativeLibc then
+      (if targetPlatform.system == "i686-linux"     then "ld-linux.so.2" else
+       if targetPlatform.system == "x86_64-linux"   then "ld-linux-x86-64.so.2" else
+       # ARM with a wildcard, which can be "" or "-armhf".
+       if targetPlatform.isArm32                    then "ld-linux*.so.3" else
+       if targetPlatform.system == "aarch64-linux"  then "ld-linux-aarch64.so.1" else
+       if targetPlatform.system == "powerpc-linux"  then "ld.so.1" else
+       if targetPlatform.system == "mips64el-linux" then "ld.so.1" else
+       if targetPlatform.system == "x86_64-darwin"  then "/usr/lib/dyld" else
+       if stdenv.lib.hasSuffix "pc-gnu" targetPlatform.config then "ld.so.1" else
+       builtins.trace
+         "Don't know the name of the dynamic linker for platform ${targetPlatform.config}, so guessing instead."
+         null)
+    else "";
+
 in
 
 stdenv.mkDerivation {
-  name =
-    (if name != "" then name else ccName + "-wrapper") +
-    (if cc != null && ccVersion != "" then "-" + ccVersion else "");
+  name = prefix
+    + (if name != "" then name else "${ccName}-wrapper")
+    + (stdenv.lib.optionalString (cc != null && ccVersion != "") "-${ccVersion}");
 
   preferLocalBuild = true;
 
@@ -51,17 +134,18 @@ stdenv.mkDerivation {
 
 
   passthru = {
-    inherit libc nativeTools nativeLibc nativePrefix isGNU isClang default_cxx_stdlib_compile;
+    inherit libc nativeTools nativeLibc nativePrefix isGNU isClang default_cxx_stdlib_compile
+            prefix infixSalt infixSalt_ _infixSalt;
 
     emacsBufferSetup = pkgs: ''
       ; We should handle propagation here too
       (mapc (lambda (arg)
         (when (file-directory-p (concat arg "/include"))
-          (setenv "NIX_CFLAGS_COMPILE" (concat (getenv "NIX_CFLAGS_COMPILE") " -isystem " arg "/include")))
+          (setenv "NIX_${infixSalt_}CFLAGS_COMPILE" (concat (getenv "NIX_${infixSalt_}CFLAGS_COMPILE") " -isystem " arg "/include")))
         (when (file-directory-p (concat arg "/lib"))
-          (setenv "NIX_LDFLAGS" (concat (getenv "NIX_LDFLAGS") " -L" arg "/lib")))
+          (setenv "NIX_${infixSalt_}LDFLAGS" (concat (getenv "NIX_${infixSalt_}LDFLAGS") " -L" arg "/lib")))
         (when (file-directory-p (concat arg "/lib64"))
-          (setenv "NIX_LDFLAGS" (concat (getenv "NIX_LDFLAGS") " -L" arg "/lib64")))) '(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
+          (setenv "NIX_${infixSalt_}LDFLAGS" (concat (getenv "NIX_${infixSalt_}LDFLAGS") " -L" arg "/lib64")))) '(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
     '';
   };
 
@@ -78,7 +162,12 @@ stdenv.mkDerivation {
       }
     ''
 
-    + optionalString (!nativeLibc) (if (!stdenv.isDarwin) then ''
+      # TODO(@Ericson2314): Unify logic next hash break
+    + optionalString (libc != null) (if (targetPlatform.isDarwin) then ''
+      echo $dynamicLinker > $out/nix-support/dynamic-linker
+
+      echo "export LD_DYLD_PATH=\"$dynamicLinker\"" >> $out/nix-support/setup-hook
+    '' else if dynamicLinker != null then ''
       dynamicLinker="${libc_lib}/lib/$dynamicLinker"
       echo $dynamicLinker > $out/nix-support/dynamic-linker
 
@@ -91,12 +180,24 @@ stdenv.mkDerivation {
       # (the *last* value counts, so ours should come first).
       echo "-dynamic-linker" $dynamicLinker > $out/nix-support/libc-ldflags-before
     '' else ''
-      echo $dynamicLinker > $out/nix-support/dynamic-linker
+      dynamicLinker=`eval 'echo $libc/lib/ld*.so.?'`
+      if [ -n "$dynamicLinker" ]; then
+        echo $dynamicLinker > $out/nix-support/dynamic-linker
 
-      echo "export LD_DYLD_PATH=\"$dynamicLinker\"" >> $out/nix-support/setup-hook
+        if [ -e ${libc_lib}/lib/32/ld-linux.so.2 ]; then
+          echo ${libc_lib}/lib/32/ld-linux.so.2 > $out/nix-support/dynamic-linker-m32
+        fi
+
+        ldflagsBefore="-dynamic-linker $dlinker"
+      fi
+
+      # The dynamic linker is passed in `ldflagsBefore' to allow
+      # explicit overrides of the dynamic linker by callers to gcc/ld
+      # (the *last* value counts, so ours should come first).
+      echo "$ldflagsBefore" > $out/nix-support/libc-ldflags-before
     '')
 
-    + optionalString (!nativeLibc) ''
+    + optionalString (libc != null) ''
       # The "-B${libc_lib}/lib/" flag is a quick hack to force gcc to link
       # against the crt1.o from our own glibc, rather than the one in
       # /usr/lib.  (This is only an issue when using an `impure'
@@ -117,7 +218,7 @@ stdenv.mkDerivation {
     ''
 
     + (if nativeTools then ''
-      ccPath="${if stdenv.isDarwin then cc else nativePrefix}/bin"
+      ccPath="${if targetPlatform.isDarwin then cc else nativePrefix}/bin"
       ldPath="${nativePrefix}/bin"
     '' else ''
       echo $cc > $out/nix-support/orig-cc
@@ -161,136 +262,114 @@ stdenv.mkDerivation {
       # Propagate the wrapped cc so that if you install the wrapper,
       # you get tools like gcov, the manpages, etc. as well (including
       # for binutils and Glibc).
-      echo ${cc} ${cc.man or ""} ${binutils_bin} ${libc_bin} > $out/nix-support/propagated-user-env-packages
+      echo ${cc} ${cc.man or ""} ${binutils_bin} ${if libc == null then "" else libc_bin} > $out/nix-support/propagated-user-env-packages
 
       echo ${toString extraPackages} > $out/nix-support/propagated-native-build-inputs
     ''
 
-    + optionalString (stdenv.isSunOS && nativePrefix != "") ''
+    + optionalString (targetPlatform.isSunOS && nativePrefix != "") ''
       # Solaris needs an additional ld wrapper.
       ldPath="${nativePrefix}/bin"
-      exec="$ldPath/ld"
-      wrap ld-solaris ${./ld-solaris-wrapper.sh}
+      exec="$ldPath/${prefix}ld"
+      wrap ld-solaris ${preWrap ./ld-solaris-wrapper.sh}
     '')
 
     + ''
       # Create a symlink to as (the assembler).  This is useful when a
       # cc-wrapper is installed in a user environment, as it ensures that
       # the right assembler is called.
-      if [ -e $ldPath/as ]; then
-        ln -s $ldPath/as $out/bin/as
+      if [ -e $ldPath/${prefix}as ]; then
+        ln -s $ldPath/${prefix}as $out/bin/${prefix}as
       fi
 
-      wrap ld ${./ld-wrapper.sh} ''${ld:-$ldPath/ld}
+      wrap ${prefix}ld ${preWrap ./ld-wrapper.sh} ''${ld:-$ldPath/${prefix}ld}
 
-      if [ -e ${binutils_bin}/bin/ld.gold ]; then
-        wrap ld.gold ${./ld-wrapper.sh} ${binutils_bin}/bin/ld.gold
+      if [ -e ${binutils_bin}/bin/${prefix}ld.gold ]; then
+        wrap ${prefix}ld.gold ${preWrap ./ld-wrapper.sh} ${binutils_bin}/bin/${prefix}ld.gold
       fi
 
       if [ -e ${binutils_bin}/bin/ld.bfd ]; then
-        wrap ld.bfd ${./ld-wrapper.sh} ${binutils_bin}/bin/ld.bfd
+        wrap ${prefix}ld.bfd ${preWrap ./ld-wrapper.sh} ${binutils_bin}/bin/${prefix}ld.bfd
       fi
 
-      export real_cc=cc
-      export real_cxx=c++
+      export real_cc=${prefix}cc
+      export real_cxx=${prefix}c++
       export default_cxx_stdlib_compile="${default_cxx_stdlib_compile}"
 
-      if [ -e $ccPath/gcc ]; then
-        wrap gcc ${./cc-wrapper.sh} $ccPath/gcc
-        ln -s gcc $out/bin/cc
-        export real_cc=gcc
-        export real_cxx=g++
+      if [ -e $ccPath/${prefix}gcc ]; then
+        wrap ${prefix}gcc ${preWrap ./cc-wrapper.sh} $ccPath/${prefix}gcc
+        ln -s ${prefix}gcc $out/bin/${prefix}cc
+        export real_cc=${prefix}gcc
+        export real_cxx=${prefix}g++
       elif [ -e $ccPath/clang ]; then
-        wrap clang ${./cc-wrapper.sh} $ccPath/clang
-        ln -s clang $out/bin/cc
+        wrap ${prefix}clang ${preWrap ./cc-wrapper.sh} $ccPath/clang
+        ln -s ${prefix}clang $out/bin/${prefix}cc
         export real_cc=clang
         export real_cxx=clang++
       fi
 
-      if [ -e $ccPath/g++ ]; then
-        wrap g++ ${./cc-wrapper.sh} $ccPath/g++
-        ln -s g++ $out/bin/c++
+      if [ -e $ccPath/${prefix}g++ ]; then
+        wrap ${prefix}g++ ${preWrap ./cc-wrapper.sh} $ccPath/${prefix}g++
+        ln -s ${prefix}g++ $out/bin/${prefix}c++
       elif [ -e $ccPath/clang++ ]; then
-        wrap clang++ ${./cc-wrapper.sh} $ccPath/clang++
-        ln -s clang++ $out/bin/c++
+        wrap ${prefix}clang++ ${preWrap ./cc-wrapper.sh} $ccPath/clang++
+        ln -s ${prefix}clang++ $out/bin/${prefix}c++
       fi
 
       if [ -e $ccPath/cpp ]; then
-        wrap cpp ${./cc-wrapper.sh} $ccPath/cpp
+        wrap ${prefix}cpp ${preWrap ./cc-wrapper.sh} $ccPath/cpp
       fi
     ''
 
     + optionalString cc.langFortran or false ''
-      wrap gfortran ${./cc-wrapper.sh} $ccPath/gfortran
-      ln -sv gfortran $out/bin/g77
-      ln -sv gfortran $out/bin/f77
+      wrap ${prefix}gfortran ${preWrap ./cc-wrapper.sh} $ccPath/${prefix}gfortran
+      ln -sv ${prefix}gfortran $out/bin/${prefix}g77
+      ln -sv ${prefix}gfortran $out/bin/${prefix}f77
     ''
 
     + optionalString cc.langJava or false ''
-      wrap gcj ${./cc-wrapper.sh} $ccPath/gcj
+      wrap ${prefix}gcj ${preWrap ./cc-wrapper.sh} $ccPath/${prefix}gcj
     ''
 
     + optionalString cc.langGo or false ''
-      wrap gccgo ${./cc-wrapper.sh} $ccPath/gccgo
+      wrap ${prefix}gccgo ${preWrap ./cc-wrapper.sh} $ccPath/${prefix}gccgo
     ''
 
     + optionalString cc.langAda or false ''
-      wrap gnatgcc ${./cc-wrapper.sh} $ccPath/gnatgcc
-      wrap gnatmake ${./gnat-wrapper.sh} $ccPath/gnatmake
-      wrap gnatbind ${./gnat-wrapper.sh} $ccPath/gnatbind
-      wrap gnatlink ${./gnatlink-wrapper.sh} $ccPath/gnatlink
+      wrap ${prefix}gnatgcc ${preWrap ./cc-wrapper.sh} $ccPath/${prefix}gnatgcc
+      wrap ${prefix}gnatmake ${preWrap ./gnat-wrapper.sh} $ccPath/${prefix}gnatmake
+      wrap ${prefix}gnatbind ${preWrap ./gnat-wrapper.sh} $ccPath/${prefix}gnatbind
+      wrap ${prefix}gnatlink ${preWrap ./gnatlink-wrapper.sh} $ccPath/${prefix}gnatlink
     ''
 
     + optionalString cc.langVhdl or false ''
-      ln -s $ccPath/ghdl $out/bin/ghdl
+      ln -s $ccPath/${prefix}ghdl $out/bin/${prefix}ghdl
     ''
 
     + ''
-      substituteAll ${./setup-hook.sh} $out/nix-support/setup-hook.tmp
+      substituteAll ${preWrap ./setup-hook.sh} $out/nix-support/setup-hook.tmp
       cat $out/nix-support/setup-hook.tmp >> $out/nix-support/setup-hook
       rm $out/nix-support/setup-hook.tmp
 
       # some linkers on some platforms don't support specific -z flags
       hardening_unsupported_flags=""
-      if [[ "$($ldPath/ld -z now 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
+      if [[ "$($ldPath/${prefix}ld -z now 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
         hardening_unsupported_flags+=" bindnow"
       fi
-      if [[ "$($ldPath/ld -z relro 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
+      if [[ "$($ldPath/${prefix}ld -z relro 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
         hardening_unsupported_flags+=" relro"
       fi
 
-      substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
-      substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh
-      cp -p ${./utils.sh} $out/nix-support/utils.sh
+      substituteAll ${preWrap ./add-flags.sh} $out/nix-support/add-flags.sh
+      substituteAll ${preWrap ./add-hardening.sh} $out/nix-support/add-hardening.sh
+      cp -p ${preWrap ./utils.sh} $out/nix-support/utils.sh
     ''
     + extraBuildCommands;
 
-  # The dynamic linker has different names on different Linux platforms.
-  dynamicLinker =
-    if !nativeLibc then
-      (if stdenv.system == "i686-linux" then "ld-linux.so.2" else
-       if stdenv.system == "x86_64-linux" then "ld-linux-x86-64.so.2" else
-       # ARM with a wildcard, which can be "" or "-armhf".
-       if stdenv.isArm then "ld-linux*.so.3" else
-       if stdenv.system == "aarch64-linux" then "ld-linux-aarch64.so.1" else
-       if stdenv.system == "powerpc-linux" then "ld.so.1" else
-       if stdenv.system == "mips64el-linux" then "ld.so.1" else
-       if stdenv.system == "x86_64-darwin" then "/usr/lib/dyld" else
-       abort "Don't know the name of the dynamic linker for this platform.")
-    else "";
+  inherit dynamicLinker;
 
   crossAttrs = {
     shell = shell.crossDrv + shell.crossDrv.shellPath;
-    libc = stdenv.ccCross.libc;
-    #
-    # This is not the best way to do this. I think the reference should be
-    # the style in the gcc-cross-wrapper, but to keep a stable stdenv now I
-    # do this sufficient if/else.
-    dynamicLinker =
-      (if stdenv.cross.arch == "arm" then "ld-linux.so.3" else
-       if stdenv.cross.arch == "mips" then "ld.so.1" else
-       if stdenv.lib.hasSuffix "pc-gnu" stdenv.cross.config then "ld.so.1" else
-       abort "don't know the name of the dynamic linker for this platform");
   };
 
   meta =
diff --git a/pkgs/build-support/gcc-cross-wrapper/add-flags b/pkgs/build-support/gcc-cross-wrapper/add-flags
deleted file mode 100644
index 9ff4522e800b..000000000000
--- a/pkgs/build-support/gcc-cross-wrapper/add-flags
+++ /dev/null
@@ -1,5 +0,0 @@
-export NIX_CROSS_CFLAGS_COMPILE="@cflagsCompile@ $NIX_CROSS_CFLAGS_COMPILE"
-export NIX_CROSS_CFLAGS_LINK="@cflagsLink@ $NIX_CROSS_CFLAGS_LINK"
-export NIX_CROSS_LDFLAGS="@ldflags@ $NIX_CROSS_LDFLAGS"
-export NIX_CROSS_LDFLAGS_BEFORE="@ldflagsBefore@ $NIX_CROSS_LDFLAGS_BEFORE"
-export NIX_CROSS_GLIBC_FLAGS_SET=1
diff --git a/pkgs/build-support/gcc-cross-wrapper/builder.sh b/pkgs/build-support/gcc-cross-wrapper/builder.sh
deleted file mode 100644
index b729144b8601..000000000000
--- a/pkgs/build-support/gcc-cross-wrapper/builder.sh
+++ /dev/null
@@ -1,120 +0,0 @@
-source $stdenv/setup
-
-mkdir $out
-mkdir $out/bin
-mkdir $out/nix-support
-
-# Force gcc to use ld-wrapper.sh when calling ld.
-cflagsCompile="-B$out/bin/"
-
-if test -z "$nativeLibc" -a -n "$libc"; then
-    cflagsCompile="$cflagsCompile -B$gccLibs/lib -B$libc/lib/ -isystem $libc_dev/include"
-    ldflags="$ldflags -L$libc/lib"
-    # Get the proper dynamic linker for glibc and uclibc. 
-    dlinker=`eval 'echo $libc/lib/ld*.so.?'`
-    if [ -n "$dlinker" ]; then
-      ldflagsBefore="-dynamic-linker $dlinker"
-
-      # The same as above, but put into files, useful for the gcc builder.
-      echo $dlinker > $out/nix-support/dynamic-linker
-      # This trick is to avoid dependencies on the cross-toolchain gcc
-      # for libgcc, libstdc++, ...
-      # -L is for libtool's .la files, and -rpath for the usual fixupPhase
-      # shrinking rpaths.
-      if [ -n "$gccLibs" ]; then
-        ldflagsBefore="$ldflagsBefore -rpath $gccLibs/lib"
-      fi
-    fi
-
-    if [ -n "$osxMinVersion" ]; then
-        cflagsCompile="$cflagsCompile -mmacosx-version-min=$osxMinVersion"
-    fi
-
-    echo "$cflagsCompile -B$libc/lib/ -idirafter $libc/include -idirafter $gcc/lib/gcc/*/*/include-fixed" > $out/nix-support/libc-cflags
-
-    echo "-L$libc/lib -rpath $libc/lib -rpath-link $libc/lib" > $out/nix-support/libc-ldflags
-
-    # The dynamic linker is passed in `ldflagsBefore' to allow
-    # explicit overrides of the dynamic linker by callers to gcc/ld
-    # (the *last* value counts, so ours should come first).
-    echo "$ldflagsBefore" > $out/nix-support/libc-ldflags-before
-fi
-
-if test -n "$nativeTools"; then
-    gccPath="$nativePrefix/bin"
-    ldPath="$nativePrefix/bin"
-else
-    ldflags="$ldflags -L$gcc/lib -L$gcc/lib64"
-    gccPath="$gcc/bin"
-    ldPath="$binutils/$crossConfig/bin"
-fi
-
-
-doSubstitute() {
-    local src=$1
-    local dst=$2
-    substitute "$src" "$dst" \
-        --subst-var "out" \
-        --subst-var "shell" \
-        --subst-var "gcc" \
-        --subst-var "gccProg" \
-        --subst-var "binutils" \
-        --subst-var "libc" \
-        --subst-var "cflagsCompile" \
-        --subst-var "cflagsLink" \
-        --subst-var "ldflags" \
-        --subst-var "ldflagsBefore" \
-        --subst-var "ldPath" \
-        --subst-var-by "ld" "$ldPath/ld"
-}
-
-
-# Make wrapper scripts around gcc, g++, and g77.  Also make symlinks
-# cc, c++, and f77.
-mkGccWrapper() {
-    local dst=$1
-    local src=$2
-
-    if ! test -f "$src"; then
-        echo "$src does not exist (skipping)"
-        return
-    fi
-
-    gccProg="$src"
-    doSubstitute "$gccWrapper" "$dst"
-    chmod +x "$dst"
-}
-
-mkGccWrapper $out/bin/$crossConfig-gcc $gccPath/$crossConfig-gcc
-#ln -s gcc $out/bin/cc
-
-mkGccWrapper $out/bin/$crossConfig-g++ $gccPath/$crossConfig-g++
-ln -s $crossConfig-g++ $out/bin/$crossConfig-c++
-
-mkGccWrapper $out/bin/$crossConfig-cpp $gccPath/$crossConfig-cpp
-
-mkGccWrapper $out/bin/$crossConfig-g77 $gccPath/$crossConfig-g77
-ln -s $crossConfig-g77 $out/bin/$crossConfig-f77
-
-ln -s $binutils/bin/$crossConfig-ar $out/bin/$crossConfig-ar
-ln -s $binutils/bin/$crossConfig-as $out/bin/$crossConfig-as
-ln -s $binutils/bin/$crossConfig-nm $out/bin/$crossConfig-nm
-ln -s $binutils/bin/$crossConfig-strip $out/bin/$crossConfig-strip
-
-
-# Make a wrapper around the linker.
-doSubstitute "$ldWrapper" "$out/bin/$crossConfig-ld"
-chmod +x "$out/bin/$crossConfig-ld"
-
-
-# Emit a setup hook.  Also store the path to the original GCC and
-# Glibc.
-test -n "$gcc" && echo $gcc > $out/nix-support/orig-cc
-test -n "$libc" && echo $libc > $out/nix-support/orig-libc
-test -n "$libc_dev" && echo $libc_dev > $out/nix-support/orig-libc-dev
-
-doSubstitute "$addFlags" "$out/nix-support/add-flags"
-
-doSubstitute "$setupHook" "$out/nix-support/setup-hook"
-
-cp -p $utils $out/nix-support/utils
diff --git a/pkgs/build-support/gcc-cross-wrapper/default.nix b/pkgs/build-support/gcc-cross-wrapper/default.nix
deleted file mode 100644
index 505d80a6b2ac..000000000000
--- a/pkgs/build-support/gcc-cross-wrapper/default.nix
+++ /dev/null
@@ -1,65 +0,0 @@
-# The Nix `gcc' stdenv.mkDerivation is not directly usable, since it doesn't
-# know where the C library and standard header files are.  Therefore
-# the compiler produced by that package cannot be installed directly
-# in a user environment and used from the command line.  This
-# stdenv.mkDerivation provides a wrapper that sets up the right environment
-# variables so that the compiler and the linker just "work".
-
-{ name ? "", stdenv, nativeTools, nativeLibc, noLibc ? false, nativePrefix ? ""
-, gcc ? null, libc ? null, binutils ? null, shell ? "", cross
-}:
-
-assert nativeTools -> nativePrefix != "";
-assert !nativeTools -> gcc != null && binutils != null;
-assert !noLibc -> (!nativeLibc -> libc != null);
-
-let
-  chosenName = if name == "" then gcc.name else name;
-  gccLibs = stdenv.mkDerivation {
-    name = chosenName + "-libs";
-    phases = [ "installPhase" ];
-    installPhase = ''
-      echo $out
-      mkdir -p "$out"
-
-      if [ -d "${gcc}/${cross.config}/lib" ]
-      then
-          cp -Rd "${gcc}/${cross.config}/lib" "$out/lib"
-          chmod -R +w "$out/lib"
-          for a in "$out/lib/"*.la; do
-              sed -i -e "s,${gcc}/${cross.config}/lib,$out/lib,g" $a
-          done
-          rm -f "$out/lib/"*.py
-      else
-          # The MinGW cross-compiler falls into this category.
-          mkdir "$out/lib"
-      fi
-    '';
-  };
-in
-stdenv.mkDerivation {
-  builder = ./builder.sh;
-  setupHook = ./setup-hook.sh;
-  gccWrapper = ./gcc-wrapper.sh;
-  ldWrapper = ./ld-wrapper.sh;
-  utils = ./utils.sh;
-  addFlags = ./add-flags;
-  inherit nativeTools nativeLibc nativePrefix gcc binutils;
-  libc = if libc ? out then libc.out else libc;
-  libc_dev = if libc ? dev then libc.dev else libc;
-  crossConfig = if cross != null then cross.config else null;
-  osxMinVersion = cross.osxMinVersion or null;
-  gccLibs = if gcc != null then gccLibs else null;
-  name = chosenName;
-  langC = if nativeTools then true else gcc.langC;
-  langCC = if nativeTools then true else gcc.langCC;
-  langF77 = if nativeTools then false else gcc ? langFortran;
-  shell = if shell == "" then stdenv.shell else shell;
-  meta = if gcc != null then gcc.meta else
-    { description = "System C compiler wrapper";
-    };
-
-  passthru = {
-    target = cross;
-  };
-}
diff --git a/pkgs/build-support/gcc-cross-wrapper/gcc-wrapper.sh b/pkgs/build-support/gcc-cross-wrapper/gcc-wrapper.sh
deleted file mode 100644
index c15777144e11..000000000000
--- a/pkgs/build-support/gcc-cross-wrapper/gcc-wrapper.sh
+++ /dev/null
@@ -1,117 +0,0 @@
-#! @shell@ -e
-
-if test -n "$NIX_CC_WRAPPER_START_HOOK"; then
-    source "$NIX_CC_WRAPPER_START_HOOK"
-fi
-
-if test -z "$NIX_CROSS_GLIBC_FLAGS_SET"; then
-    source @out@/nix-support/add-flags
-fi
-
-source @out@/nix-support/utils
-
-
-# Figure out if linker flags should be passed.  GCC prints annoying
-# warnings when they are not needed.
-dontLink=0
-if test "$*" = "-v" -o -z "$*"; then
-    dontLink=1
-else
-    for i in "$@"; do
-        if test "$i" = "-c"; then
-            dontLink=1
-        elif test "$i" = "-S"; then
-            dontLink=1
-        elif test "$i" = "-E"; then
-            dontLink=1
-        elif test "$i" = "-E"; then
-            dontLink=1
-        elif test "$i" = "-M"; then
-            dontLink=1
-        elif test "$i" = "-MM"; then
-            dontLink=1
-        fi
-    done
-fi
-
-
-# Optionally filter out paths not refering to the store.
-params=("$@")
-if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE"; then
-    rest=()
-    n=0
-    while test $n -lt ${#params[*]}; do
-        p=${params[n]}
-        p2=${params[$((n+1))]}
-        if test "${p:0:3}" = "-L/" && badPath "${p:2}"; then
-            skip $p
-        elif test "$p" = "-L" && badPath "$p2"; then
-            n=$((n + 1)); skip $p2
-        elif test "${p:0:3}" = "-I/" && badPath "${p:2}"; then
-            skip $p
-        elif test "$p" = "-I" && badPath "$p2"; then
-            n=$((n + 1)); skip $p2
-        elif test "$p" = "-isystem" && badPath "$p2"; then
-            n=$((n + 1)); skip $p2
-        else
-            rest=("${rest[@]}" "$p")
-        fi
-        n=$((n + 1))
-    done
-    params=("${rest[@]}")
-fi
-
-
-# Add the flags for the C compiler proper.
-extraAfter=($NIX_CROSS_CFLAGS_COMPILE)
-extraBefore=()
-
-if test "$dontLink" != "1"; then
-
-    # Add the flags that should only be passed to the compiler when
-    # linking.
-    extraAfter=(${extraAfter[@]} $NIX_CROSS_CFLAGS_LINK)
-
-    # Add the flags that should be passed to the linker (and prevent
-    # `ld-wrapper' from adding NIX_CROSS_LDFLAGS again).
-    for i in $NIX_CROSS_LDFLAGS_BEFORE; do
-        if test "${i:0:3}" = "-L/"; then
-            extraBefore=(${extraBefore[@]} "$i")
-        else
-            extraBefore=(${extraBefore[@]} "-Wl,$i")
-        fi
-    done
-    for i in $NIX_CROSS_LDFLAGS; do
-        if test "${i:0:3}" = "-L/"; then
-            extraAfter=(${extraAfter[@]} "$i")
-        else
-            extraAfter=(${extraAfter[@]} "-Wl,$i")
-        fi
-    done
-    export NIX_CROSS_LDFLAGS_SET=1
-fi
-
-# Optionally print debug info.
-if test "$NIX_DEBUG" = "1"; then
-  echo "original flags to @gccProg@:" >&2
-  for i in "${params[@]}"; do
-      echo "  $i" >&2
-  done
-  echo "extraBefore flags to @gccProg@:" >&2
-  for i in ${extraBefore[@]}; do
-      echo "  $i" >&2
-  done
-  echo "extraAfter flags to @gccProg@:" >&2
-  for i in ${extraAfter[@]}; do
-      echo "  $i" >&2
-  done
-fi
-
-if test -n "$NIX_CC_WRAPPER_EXEC_HOOK"; then
-    source "$NIX_CC_WRAPPER_EXEC_HOOK"
-fi
-
-# We want gcc to call the wrapper linker, not that of binutils.
-export PATH="@ldPath@:$PATH"
-
-exec @gccProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}
diff --git a/pkgs/build-support/gcc-cross-wrapper/ld-wrapper.sh b/pkgs/build-support/gcc-cross-wrapper/ld-wrapper.sh
deleted file mode 100644
index 226fad833599..000000000000
--- a/pkgs/build-support/gcc-cross-wrapper/ld-wrapper.sh
+++ /dev/null
@@ -1,145 +0,0 @@
-#! @shell@ -e
-
-if test -n "$NIX_LD_WRAPPER_START_HOOK"; then
-    source "$NIX_LD_WRAPPER_START_HOOK"
-fi
-
-if test -z "$NIX_CROSS_GLIBC_FLAGS_SET"; then
-    source @out@/nix-support/add-flags
-fi
-
-source @out@/nix-support/utils
-
-
-# Optionally filter out paths not refering to the store.
-params=("$@")
-if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE" \
-        -a \( -z "$NIX_IGNORE_LD_THROUGH_GCC" -o -z "$NIX_CROSS_LDFLAGS_SET" \); then
-    rest=()
-    n=0
-    while test $n -lt ${#params[*]}; do
-        p=${params[n]}
-        p2=${params[$((n+1))]}
-        if test "${p:0:3}" = "-L/" && badPath "${p:2}"; then
-            skip $p
-        elif test "$p" = "-L" && badPath "$p2"; then
-            n=$((n + 1)); skip $p2
-        elif test "$p" = "-rpath" && badPath "$p2"; then
-            n=$((n + 1)); skip $p2
-        elif test "$p" = "-dynamic-linker" && badPath "$p2"; then
-            n=$((n + 1)); skip $p2
-        elif test "${p:0:1}" = "/" && badPath "$p"; then
-            # We cannot skip this; barf.
-            echo "impure path \`$p' used in link" >&2
-            exit 1
-        else
-            rest=("${rest[@]}" "$p")
-        fi
-        n=$((n + 1))
-    done
-    params=("${rest[@]}")
-fi
-
-
-extra=()
-extraBefore=()
-
-if test -z "$NIX_CROSS_LDFLAGS_SET"; then
-    extra=(${extra[@]} $NIX_CROSS_LDFLAGS)
-    extraBefore=(${extraBefore[@]} $NIX_CROSS_LDFLAGS_BEFORE)
-fi
-
-
-# Add all used dynamic libraries to the rpath.
-if test "$NIX_DONT_SET_RPATH" != "1"; then
-
-    # First, find all -L... switches.
-    allParams=("${params[@]}" ${extra[@]})
-    libPath=""
-    addToLibPath() {
-        local path="$1"
-        if test "${path:0:1}" != "/"; then return 0; fi
-        case "$path" in
-            *..*|*./*|*/.*|*//*)
-                local path2
-                if path2=$(readlink -f "$path"); then
-                    path="$path2"
-                fi
-                ;;
-        esac
-        case $libPath in
-            *\ $path\ *) return 0 ;;
-        esac
-        libPath="$libPath $path "
-    }
-    n=0
-    while test $n -lt ${#allParams[*]}; do
-        p=${allParams[n]}
-        p2=${allParams[$((n+1))]}
-        if test "${p:0:3}" = "-L/"; then
-            addToLibPath ${p:2}
-        elif test "$p" = "-L"; then
-            addToLibPath ${p2}
-            n=$((n + 1))
-        fi
-        n=$((n + 1))
-    done
-
-    # Second, for each -l... switch, find the directory containing the
-    # library and add it to the rpath.
-    rpath=""
-    addToRPath() {
-        # If the path is not in the store, don't add it to the rpath.
-        # This typically happens for libraries in /tmp that are later
-        # copied to $out/lib.  If not, we're screwed.
-        if test "${1:0:${#NIX_STORE}}" != "$NIX_STORE"; then return 0; fi
-        case $rpath in
-            *\ $1\ *) return 0 ;;
-        esac
-        rpath="$rpath $1 "
-    }
-    findLib() {
-        for i in $libPath; do
-            if test -f $i/lib$1.so; then
-                addToRPath $i
-            fi
-        done
-    }
-    n=0
-    while test $n -lt ${#allParams[*]}; do
-        p=${allParams[n]}
-        p2=${allParams[$((n+1))]}
-        if test "${p:0:2}" = "-l"; then
-            findLib ${p:2}
-        elif test "$p" = "-l"; then
-            # I haven't seen `-l foo', but you never know...
-            findLib ${p2}
-            n=$((n + 1))
-        fi
-        n=$((n + 1))
-    done
-
-    # Finally, add `-rpath' switches.
-    for i in $rpath; do
-        extra=(${extra[@]} -rpath $i -rpath-link $i)
-    done
-fi
-
-
-# Optionally print debug info.
-if test "$NIX_DEBUG" = "1"; then
-  echo "original flags to @ld@:" >&2
-  for i in "${params[@]}"; do
-      echo "  $i" >&2
-  done
-  echo "extra flags to @ld@:" >&2
-  for i in ${extra[@]}; do
-      echo "  $i" >&2
-  done
-fi
-
-if test -n "$NIX_LD_WRAPPER_EXEC_HOOK"; then
-    source "$NIX_LD_WRAPPER_EXEC_HOOK"
-fi
-
-exec @ld@ ${extraBefore[@]} "${params[@]}" ${extra[@]}
diff --git a/pkgs/build-support/gcc-cross-wrapper/setup-hook.sh b/pkgs/build-support/gcc-cross-wrapper/setup-hook.sh
deleted file mode 100644
index 599954bd127d..000000000000
--- a/pkgs/build-support/gcc-cross-wrapper/setup-hook.sh
+++ /dev/null
@@ -1,90 +0,0 @@
-NIX_CROSS_CFLAGS_COMPILE=""
-NIX_CROSS_LDFLAGS=""
-
-crossAddCVars () {
-    if test -d $1/include; then
-        export NIX_CROSS_CFLAGS_COMPILE="$NIX_CROSS_CFLAGS_COMPILE -I$1/include"
-    fi
-
-    if test -d $1/lib; then
-        export NIX_CROSS_LDFLAGS="$NIX_CROSS_LDFLAGS -L$1/lib -rpath-link $1/lib"
-    fi
-}
-
-crossEnvHooks+=(crossAddCVars)
-
-crossStripDirs() {
-    local dirs="$1"
-    local stripFlags="$2"
-    local dirsNew=
-
-    for d in ${dirs}; do
-        if test -d "$prefix/$d"; then
-            dirsNew="${dirsNew} $prefix/$d "
-        fi
-    done
-    dirs=${dirsNew}
-
-    if test -n "${dirs}"; then
-        header "cross stripping (with flags $stripFlags) in $dirs"
-        # libc_nonshared.a should never be stripped, or builds will break.
-        find $dirs -type f -print0 | xargs -0 ${xargsFlags:--r} $crossConfig-strip $stripFlags || true
-        stopNest
-    fi
-}
-
-crossStrip () {
-    # In cross_renaming we may rename dontCrossStrip to dontStrip, and
-    # dontStrip to dontNativeStrip.
-    # TODO: strip _only_ ELF executables, and return || fail here...
-    if test -z "$dontCrossStrip"; then
-        stripDebugList=${stripDebugList:-lib lib64 libexec bin sbin}
-        if test -n "$stripDebugList"; then
-            crossStripDirs "$stripDebugList" "${stripDebugFlags:--S}"
-        fi
-        
-        stripAllList=${stripAllList:-}
-        if test -n "$stripAllList"; then
-            crossStripDirs "$stripAllList" "${stripAllFlags:--s}"
-        fi
-    fi
-}
-
-preDistPhases=(${preDistPhases[@]} crossStrip)
-
-
-# Note: these come *after* $out in the PATH (see setup.sh).
-
-if test -n "@gcc@"; then
-    PATH=$PATH:@gcc@/bin
-fi
-
-if test -n "@binutils@"; then
-    PATH=$PATH:@binutils@/bin
-fi
-
-if test -n "@libc@"; then
-    PATH=$PATH:@libc@/bin
-    crossAddCVars @libc@
-fi
-
-if test "$dontSetConfigureCross" != "1"; then
-    configureFlags="$configureFlags --build=$system --host=$crossConfig"
-fi
-# Disabling the tests when cross compiling, as usually the tests are meant for
-# native compilations.
-doCheck=""
-
-# Don't strip foreign binaries with native "strip" tool.
-dontStrip=1
-
-# Add the output as an rpath.
-if test "$NIX_NO_SELF_RPATH" != "1"; then
-    export NIX_CROSS_LDFLAGS="-rpath $out/lib -rpath-link $out/lib $NIX_CROSS_LDFLAGS"
-    if test -n "$NIX_LIB64_IN_SELF_RPATH"; then
-        export NIX_CROSS_LDFLAGS="-rpath $out/lib64 -rpath-link $out/lib $NIX_CROSS_LDFLAGS"
-    fi
-fi
-
-export CC=${crossConfig}-gcc
-export CXX=${crossConfig}-g++
diff --git a/pkgs/build-support/gcc-cross-wrapper/utils.sh b/pkgs/build-support/gcc-cross-wrapper/utils.sh
deleted file mode 100644
index 753b3772e956..000000000000
--- a/pkgs/build-support/gcc-cross-wrapper/utils.sh
+++ /dev/null
@@ -1,24 +0,0 @@
-skip () {
-    if test "$NIX_DEBUG" = "1"; then
-        echo "skipping impure path $1" >&2
-    fi
-}
-
-
-# Checks whether a path is impure.  E.g., `/lib/foo.so' is impure, but
-# `/nix/store/.../lib/foo.so' isn't.
-badPath() {
-    local p=$1
-    
-    # Relative paths are okay (since they're presumably relative to
-    # the temporary build directory).
-    if test "${p:0:1}" != "/"; then return 1; fi
-    
-    # Otherwise, the path should refer to the store or some temporary
-    # directory (including the build directory).
-    test \
-        "$p" != "/dev/null" -a \
-        "${p:0:${#NIX_STORE}}" != "$NIX_STORE" -a \
-        "${p:0:4}" != "/tmp" -a \
-        "${p:0:${#NIX_BUILD_TOP}}" != "$NIX_BUILD_TOP"
-}
diff --git a/pkgs/build-support/gcc-wrapper-old/default.nix b/pkgs/build-support/gcc-wrapper-old/default.nix
index a87c726e0a8b..f8a7c62edc73 100644
--- a/pkgs/build-support/gcc-wrapper-old/default.nix
+++ b/pkgs/build-support/gcc-wrapper-old/default.nix
@@ -61,7 +61,6 @@ stdenv.mkDerivation {
 
   crossAttrs = {
     shell = shell.crossDrv + shell.crossDrv.shellPath;
-    libc = stdenv.ccCross.libc;
     coreutils = coreutils.crossDrv;
     binutils = binutils.crossDrv;
     gcc = gcc.crossDrv;