Remove gccStdInc

This reverts d927da8dae1c4ff0c492d41e00835cfd08ff84d7. Having a copy
of gcc-wrapper/setup-hook.sh is bad for maintainability - it had
already started to diverge. Also, gccStdInc gave a nix-env conflict
with the standard gcc. And it wasn't actually used in Nixpkgs.

Instead, if you really need to change "-isystem" to "-I", you can now
set ccIncludeFlag to "-I".

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

@@ -9,7 +9,6 @@
 , cc ? null, libc ? null, binutils ? null, coreutils ? null, shell ? stdenv.shell
 , zlib ? null, extraPackages ? []
 , dyld ? null # TODO: should this be a setup-hook on dyld?
-, setupHook ? ./setup-hook.sh
 }:
 
 with stdenv.lib;
@@ -226,7 +225,7 @@ stdenv.mkDerivation {
     ''
 
     + ''
-      substituteAll ${setupHook} $out/nix-support/setup-hook.tmp
+      substituteAll ${./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
 

pkgs/build-support/cc-wrapper/setup-hook-stdinc.sh

@@ -1,44 +0,0 @@
-# This is an alternate setup hook for gcc-wrapper that uses the -I flag to
-# add include search paths instead of -isystem. We need this for some packages
-# because -isystem can change the search order specified by prior -I flags.
-# Changing the search order can point gcc to the wrong package's headers.
-# The -I flag will never change the order of prior flags.
-
-export NIX_CC=@out@
-
-addCVars () {
-    if [ -d $1/include ]; then
-        export NIX_CFLAGS_COMPILE+=" -I $1/include"
-    fi
-
-    if [ -d $1/lib64 -a ! -L $1/lib64 ]; then
-        export NIX_LDFLAGS+=" -L$1/lib64"
-    fi
-
-    if [ -d $1/lib ]; then
-        export NIX_LDFLAGS+=" -L$1/lib"
-    fi
-}
-
-envHooks+=(addCVars)
-
-# Note: these come *after* $out in the PATH (see setup.sh).
-
-if [ -n "@gcc@" ]; then
-    addToSearchPath PATH @gcc@/bin
-fi
-
-if [ -n "@binutils@" ]; then
-    addToSearchPath PATH @binutils@/bin
-fi
-
-if [ -n "@libc@" ]; then
-    addToSearchPath PATH @libc@/bin
-fi
-
-if [ -n "@coreutils@" ]; then
-    addToSearchPath PATH @coreutils@/bin
-fi
-
-export CC=gcc
-export CXX=g++

pkgs/build-support/cc-wrapper/setup-hook.sh

@@ -2,7 +2,7 @@ export NIX_CC=@out@
 
 addCVars () {
     if [ -d $1/include ]; then
-        export NIX_CFLAGS_COMPILE+=" -isystem $1/include"
+        export NIX_CFLAGS_COMPILE+=" ${ccIncludeFlag:--isystem} $1/include"
     fi
 
     if [ -d $1/lib64 -a ! -L $1/lib64 ]; then

pkgs/top-level/all-packages.nix

@@ -4511,27 +4511,6 @@ let
       inherit stdenv gcc binutils libc shell name cross;
     });
 
-  /* Alternative GCC wrapper that uses the standard -I include flag instead of
-   * -isystem. The -isystem flag can change the search order specified by prior
-   * -I flags. For KDE 5 packages, we don't want to interfere with the include
-   * search path order specified by the build system. Some packages depend on
-   * Qt 4 and Qt 5 simultaneously; because the two Qt versions provide headers
-   * with the same filenames, we must respect the search order specified by the
-   * build system so that the Qt 4 components find the Qt 4 headers and the Qt 5
-   * components find the Qt 5 headers.
-   */
-  wrapGCCStdInc = glibc: baseGCC: (import ../build-support/cc-wrapper) {
-    nativeTools = stdenv.cc.nativeTools or false;
-    nativeLibc = stdenv.cc.nativeLibc or false;
-    nativePrefix = stdenv.cc.nativePrefix or "";
-    cc = baseGCC;
-    libc = glibc;
-    inherit stdenv binutils coreutils zlib;
-    setupHook = ../build-support/cc-wrapper/setup-hook-stdinc.sh;
-  };
-
-  gccStdInc = wrapGCCStdInc glibc gcc.cc;
-
   # prolog
   yap = callPackage ../development/compilers/yap { };