Adding a new version of the gcc-wrapper, named gcc-wrapper2, in order not to rebuild stdenv.

In this gcc-wrapper2 I made the ld-wrapper.sh to handle the linking with shared
objects through direct pass as ld command arguments of the absolute path to shared
objects, instead of using the -L/-l combinations.

cmake 'FindXXX.cmake' modules make a strong usage of the dynamic linking directly
passing the absolute path to the shared object to the linker, and as our wrapper did
not add any -rpath for those, writting the nix expressions for some cmake packages
resulted in a lot of tricks, compared to using this gcc-wrapper2.

This gcc-wrapper2/ld-wrapper.sh should become the gcc-wrapper/ld-wrapper in a
stdenv update.

I also updated some cmake expressions to use this gcc-wrapper2, and reduced its
tricks.

I also updated the cmake setup-hook for it to make cmake not touch any rpath decided
at build time, when running the 'make install' of makefiles created by cmake.

svn path=/nixpkgs/trunk/; revision=18885

pkgs/applications/graphics/autopanosiftc/default.nix

···
 
   buildInputs = [ cmake libpng libtiff libjpeg panotools libxml2 ];
 
-  # I added these flags to get all the rpaths right, which I guess they are
-  # taken from the qt4 sources. Not very nice.
-  cmakeFlags = "-DCMAKE_SHARED_LINKER_FLAGS=\"-Wl,-rpath,$out/lib\"" +
-    " -DCMAKE_EXE_LINKER_FLAGS=\"-Wl,-rpath,$out/lib" +
-    " -lpng12 -lpano13 -ljpeg -ltiff -lz -lxml2 \"" +
-    " -DCMAKE_SKIP_BUILD_RPATH=ON" +
-    " -DCMAKE_BUILD_TYPE=Release" +
-    " -DCMAKE_INSTALL_PREFIX=$out";
-
-  dontUseCmakeConfigure = true;
-
-  # I rewrote the configure phase to get the $out references evaluated in
-  # cmakeFlags
-  configurePhase = ''
-    set -x
-    mkdir -p build;
-    cd build
-    eval -- "cmake .. $cmakeFlags"
-    set +x
-    '';
-
   meta = {
     homepage = http://hugin.sourceforge.net/;
     description = "Implementation in C of the autopano-sift algorithm for automatically stitching panoramas";

pkgs/applications/graphics/freepv/default.nix

···
     sed -i -e '/mozilla/d' src/CMakeLists.txt
   '';
 
-  # I added these flags to get all the rpaths right, which I guess they are
-  # taken from the qt4 sources. Not very nice.
-  cmakeFlags = " -DCMAKE_EXE_LINKER_FLAGS=\"" +
-    " -lpng12 -lXxf86vm -ljpeg -lz -lglut -lGLU -lxml2 -lX11\"" +
-    " -DCMAKE_SKIP_BUILD_RPATH=ON" +
-    " -DCMAKE_BUILD_TYPE=Release" +
-    " -DCMAKE_INSTALL_PREFIX=$out";
-
-  dontUseCmakeConfigure = true;
-
-  # I rewrote the configure phase to get the $out references evaluated in
-  # cmakeFlags
-  configurePhase = ''
-    set -x
-    mkdir -p build;
-    cd build
-    eval -- "cmake .. $cmakeFlags"
-    set +x
-    '';
-
   meta = {
     description = "Open source panorama viewer using GL";
     homepage = http://freepv.sourceforge.net/;

pkgs/applications/graphics/hugin/default.nix

···
 
   NIX_LDFLAGS = "-lrt";
 
-  # I added these flags to get all the rpaths right, which I guess they are
-  # taken from the qt4 sources. Not very nice.
-  cmakeFlags = "-DCMAKE_SHARED_LINKER_FLAGS=\"-Wl,-rpath,$out/lib\"" +
-    " -DCMAKE_EXE_LINKER_FLAGS=\"-Wl,-rpath,$out/lib" +
-    " -lpng12 -lpano13 -lImath -lIlmImf -lIex -lHalf -lIlmThread" +
-    " -ljpeg -ltiff -lz -lexiv2 -lboost_thread\"" +
-    " -DCMAKE_SKIP_BUILD_RPATH=ON" +
-    " -DCMAKE_BUILD_TYPE=Release" +
-    " -DCMAKE_INSTALL_PREFIX=$out";
-
-  buildInputs = [ cmake panotools wxGTK libtiff libpng openexr boost pkgconfig exiv2 gettext ilmbase ];
-
-  dontUseCmakeConfigure = true;
+  buildInputs = [ cmake panotools wxGTK libtiff libpng openexr boost pkgconfig
+    exiv2 gettext ilmbase ];
 
-  # I rewrote the configure phase to get the $out references evaluated in
-  # cmakeFlags
-  configurePhase = ''
-    set -x
-    mkdir -p build;
-    cd build
-    eval -- "cmake .. $cmakeFlags"
-    set +x
-    '';
   postInstall = ''
     ensureDir "$out/nix-support"
     echo "${enblendenfuse} ${autopanosiftc}" > $out/nix-support/propagated-user-env-packages

pkgs/applications/graphics/paraview/default.nix

···
 { fetchurl, stdenv, cmake, qt4 }:
 
 stdenv.mkDerivation {
-  name = "paraview-3.4.0";
+  name = "paraview-3.6.1";
   src = fetchurl {
-    url = http://www.paraview.org/files/v3.4/paraview-3.4.0.tar.gz;
-    sha256 = "27544f442e957e9aa60b32c674f2dcd84fffeecc9a40071ef6e305333413187d";
+    url = http://www.paraview.org/files/v3.6/paraview-3.6.1.tar.gz;
+    sha256 = "1dh0dqbdvjagy122nbwr1gg03ck2if2aqqbvzcpkx38sz12cjh7h";
   };
 
-  patches = [ ./include-qobject.patch ];
-
-  # I added these flags to get all the rpaths right, which I guess they are
-  # taken from the qt4 sources. Not very nice.
-  cmakeFlags = "-DCMAKE_SHARED_LINKER_FLAGS=\"-Wl,-rpath,$out/lib/paraview-3.4\"" +
-    " -DCMAKE_EXE_LINKER_FLAGS=\"-Wl,-rpath,$out/lib/paraview-3.4" +
-    " -lpng12 -lSM -lICE -lXrender -lXrandr -lXcursor -lXinerama" +
-    " -lXfixes -lfreetype -lfontconfig -lXext -lX11 -lssl -lXt -lz\"" +
-    " -DCMAKE_SKIP_BUILD_RPATH=ON" +
-    " -DCMAKE_BUILD_TYPE=Release" +
-    " -DCMAKE_INSTALL_PREFIX=$out";
-
-  dontUseCmakeConfigure = true;
-
-  # I rewrote the configure phase to get the $out references evaluated in
-  # cmakeFlags
-  configurePhase = ''
-    set -x
-    mkdir -p build;
-    cd build
-    eval -- "cmake .. $cmakeFlags"
-    set +x
-    '';
+  preConfigure = ''
+    export NIX_LDFLAGS="$NIX_LDFLAGS -rpath $out/lib/paraview-3.6"
+  '';
 
   buildInputs = [ cmake qt4 ];
 

pkgs/applications/graphics/paraview/include-qobject.patch

···
-diff --git a/VTK/GUISupport/Qt/CMakeLists.txt b/VTK/GUISupport/Qt/CMakeLists.txt
-index 2c35be7..866f1aa 100644
---- a/VTK/GUISupport/Qt/CMakeLists.txt
-+++ b/VTK/GUISupport/Qt/CMakeLists.txt
-@@ -166,6 +166,7 @@ IF(DESIRED_QT_VERSION MATCHES 4)
-      )
-   ENDIF(QT_QTGUI_LIBRARY)
-   INCLUDE_DIRECTORIES(${QT_QTDESIGNER_INCLUDE_DIR})
-+  INCLUDE_DIRECTORIES(${QT_QTCORE_INCLUDE_DIR})
-   QT4_WRAP_CPP ( PluginMocSrcs ${PluginMocHeaders} )
- ELSE(DESIRED_QT_VERSION MATCHES 4)
-   QT_WRAP_CPP ( QVTKWidgetPlugin PluginMocSrcs ${PluginMocHeaders} )
-diff --git a/VTK/GUISupport/Qt/vtkEventQtSlotConnect.h b/VTK/GUISupport/Qt/vtkEventQtSlotConnect.h
-index 6782b90..ced3a67 100644
---- a/VTK/GUISupport/Qt/vtkEventQtSlotConnect.h
-+++ b/VTK/GUISupport/Qt/vtkEventQtSlotConnect.h
-@@ -43,7 +43,7 @@
- #include "vtkObject.h"
- #include "vtkCommand.h"  // for event defines
- #include "QVTKWin32Header.h"  // for export define
--#include "qobject.h"          // for version info
-+#include <qobject.h>          // for version info
- 
- class QObject;
- class vtkQtConnections;
-diff --git a/VTK/GUISupport/Qt/vtkQtConnection.h b/VTK/GUISupport/Qt/vtkQtConnection.h
-index 923ec2e..b189ddc 100644
---- a/VTK/GUISupport/Qt/vtkQtConnection.h
-+++ b/VTK/GUISupport/Qt/vtkQtConnection.h
-@@ -33,7 +33,7 @@
- 
- #include "vtkObject.h"
- #include "vtkCommand.h"  // for event defines
--#include "qobject.h"
-+#include <qobject.h>
- 
- class QObject;
- class vtkCallbackCommand;

pkgs/applications/video/avidemux/default.nix

···
 
   cmakeFlags = "-DPTHREAD_INCLUDE_DIR=${stdenv.glibc}/include" +
     " -DGETTEXT_INCLUDE_DIR=${gettext}/include" +
-    " -DSDL_INCLUDE_DIR=${SDL}/include/SDL" +
-    " -DCMAKE_SKIP_BUILD_RPATH=ON" +
-    " -DCMAKE_BUILD_TYPE=Release";
+    " -DSDL_INCLUDE_DIR=${SDL}/include/SDL";
 
-  NIX_LDFLAGS="-lxml2 -lXv -lSDL -lQtGui -lQtCore -lpthread";
+  NIX_LDFLAGS="-lpthread";
 
   postInstall = ''
     cd $NIX_BUILD_TOP/$sourceRoot

pkgs/build-support/gcc-wrapper2/README

···
+To be removed after we merge stdenv-updates in.
+stdenv-updates should have this gcc-wrapper2 as gcc-wrapper.
+
+Changelog against gcc-wrapper:
+- Support for linking shared objects with direct mention of the /path/libxxx.so object,
+  thus, adding its path to the rpath.

pkgs/build-support/gcc-wrapper2/add-flags

···
+# `-B@out@/bin' forces gcc to use ld-wrapper.sh when calling ld.
+export NIX_CFLAGS_COMPILE="-B@out@/bin/ $NIX_CFLAGS_COMPILE"
+
+if test -e @out@/nix-support/libc-cflags; then
+    export NIX_CFLAGS_COMPILE="$(cat @out@/nix-support/libc-cflags) $NIX_CFLAGS_COMPILE"
+fi
+
+if test -e @out@/nix-support/gcc-cflags; then
+    export NIX_CFLAGS_COMPILE="$(cat @out@/nix-support/gcc-cflags) $NIX_CFLAGS_COMPILE"
+fi
+
+if test -e @out@/nix-support/libc-ldflags; then
+    export NIX_LDFLAGS="$NIX_LDFLAGS $(cat @out@/nix-support/libc-ldflags)"
+fi
+
+if test -e @out@/nix-support/gcc-ldflags; then
+    export NIX_LDFLAGS="$NIX_LDFLAGS $(cat @out@/nix-support/gcc-ldflags)"
+fi
+
+if test -e @out@/nix-support/libc-ldflags-before; then
+    export NIX_LDFLAGS_BEFORE="$(cat @out@/nix-support/libc-ldflags-before) $NIX_LDFLAGS_BEFORE"
+fi
+
+export NIX_GCC_WRAPPER_FLAGS_SET=1

pkgs/build-support/gcc-wrapper2/builder.sh

···
+source $stdenv/setup
+
+
+ensureDir $out/bin
+ensureDir $out/nix-support
+
+
+if test -z "$nativeLibc"; then
+    dynamicLinker="$libc/lib/$dynamicLinker"
+    echo $dynamicLinker > $out/nix-support/dynamic-linker
+
+    if test -e $libc/lib/32/ld-linux.so.2; then
+        echo $libc/lib/32/ld-linux.so.2 > $out/nix-support/dynamic-linker-m32
+    fi
+
+    # The "-B$libc/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'
+    # compiler/linker, i.e., one that searches /usr/lib and so on.)
+    #
+    # Unfortunately, setting -B appears to override the default search
+    # path. Thus, the gcc-specific "../includes-fixed" directory is
+    # now longer searched and glibc's <limits.h> header fails to
+    # compile, because it uses "#include_next <limits.h>" to find the
+    # limits.h file in ../includes-fixed. To remedy the problem,
+    # another -idirafter is necessary to add that directory again.
+    echo "-B$libc/lib/ -idirafter $libc/include -idirafter $gcc/lib/gcc/*/*/include-fixed" > $out/nix-support/libc-cflags
+
+    echo "-L$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 "-dynamic-linker $dynamicLinker" > $out/nix-support/libc-ldflags-before
+fi
+
+if test -n "$nativeTools"; then
+    gccPath="$nativePrefix/bin"
+    ldPath="$nativePrefix/bin"
+else
+    if test -e "$gcc/lib64"; then
+        gccLDFlags="$gccLDFlags -L$gcc/lib64"
+    fi
+    gccLDFlags="$gccLDFlags -L$gcc/lib"
+    echo "$gccLDFlags" > $out/nix-support/gcc-ldflags
+
+    # GCC shows $gcc/lib in `gcc -print-search-dirs', but not
+    # $gcc/lib64 (even though it does actually search there...)..
+    # This confuses libtool.  So add it to the compiler tool search
+    # path explicitly.
+    if test -e "$gcc/lib64"; then
+        gccCFlags="$gccCFlags -B$gcc/lib64"
+    fi
+    echo "$gccCFlags" > $out/nix-support/gcc-cflags
+    
+    gccPath="$gcc/bin"
+    ldPath="$binutils/bin"
+fi
+
+
+doSubstitute() {
+    local src=$1
+    local dst=$2
+    # Can't use substitute() here, because replace may not have been
+    # built yet (in the bootstrap).
+    sed \
+        -e "s^@out@^$out^g" \
+        -e "s^@shell@^$shell^g" \
+        -e "s^@gcc@^$gcc^g" \
+        -e "s^@gccProg@^$gccProg^g" \
+        -e "s^@binutils@^$binutils^g" \
+        -e "s^@libc@^$libc^g" \
+        -e "s^@ld@^$ldPath/ld^g" \
+        < "$src" > "$dst" 
+}
+
+
+# Make wrapper scripts around gcc, g++, and gfortran.  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/gcc $gccPath/gcc
+ln -s gcc $out/bin/cc
+
+mkGccWrapper $out/bin/g++ $gccPath/g++
+ln -s g++ $out/bin/c++
+
+if test -e $gccPath/gfortran; then
+    mkGccWrapper $out/bin/gfortran $gccPath/gfortran
+    ln -s gfortran $out/bin/g77
+    ln -s gfortran $out/bin/f77
+fi
+
+
+# Create a symlink to as (the assembler).  This is useful when a
+# gcc-wrapper is installed in a user environment, as it ensures that
+# the right assembler is called.
+ln -s $ldPath/as $out/bin/as
+
+
+# Make a wrapper around the linker.
+doSubstitute "$ldWrapper" "$out/bin/ld"
+chmod +x "$out/bin/ld"
+
+
+# Emit a setup hook.  Also store the path to the original GCC and
+# Glibc.
+test -n "$gcc" && echo $gcc > $out/nix-support/orig-gcc
+test -n "$libc" && echo $libc > $out/nix-support/orig-libc
+
+doSubstitute "$addFlags" "$out/nix-support/add-flags.sh"
+
+doSubstitute "$setupHook" "$out/nix-support/setup-hook"
+
+cp -p $utils $out/nix-support/utils.sh
+
+
+# Propagate the wrapped gcc so that if you install the wrapper, you get
+# tools like gcov, the manpages, etc. as well (including for binutils
+# and Glibc).
+if test -z "$nativeTools"; then
+    echo $gcc $binutils $libc > $out/nix-support/propagated-user-env-packages
+fi

pkgs/build-support/gcc-wrapper2/default.nix

···
+# 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, nativePrefix ? ""
+, gcc ? null, libc ? null, binutils ? null, shell ? ""
+}:
+
+assert nativeTools -> nativePrefix != "";
+assert !nativeTools -> gcc != null && binutils != null;
+assert !nativeLibc -> libc != null;
+
+let
+
+  gccVersion = (builtins.parseDrvName gcc.name).version;
+  gccName = (builtins.parseDrvName gcc.name).name;
+  
+in
+
+stdenv.mkDerivation {
+  name =
+    (if name != "" then name else gccName + "-wrapper") +
+    (if gcc != null && gccVersion != "" then "-" + gccVersion else "");
+  
+  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;
+  libc = if nativeLibc then null else libc;
+  binutils = if nativeTools then null else binutils;
+  
+  langC = if nativeTools then true else gcc.langC;
+  langCC = if nativeTools then true else gcc.langCC;
+  langFortran = if nativeTools then false else gcc ? langFortran;
+  shell = if shell == "" then stdenv.shell else shell;
+  
+  meta =
+    let gcc_ = if gcc != null then gcc else {}; in
+    (if gcc_ ? meta then removeAttrs gcc.meta ["priority"] else {}) //
+    { description =
+        stdenv.lib.attrByPath ["meta" "description"] "System C compiler" gcc_
+        + " (wrapper script)";
+    };
+
+  # 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
+       if stdenv.system == "powerpc-linux" then "ld.so.1" else
+       abort "don't know the name of the dynamic linker for this platform")
+    else "";
+}

pkgs/build-support/gcc-wrapper2/gcc-wrapper.sh

···
+#! @shell@ -e
+
+if test -n "$NIX_GCC_WRAPPER_START_HOOK"; then
+    source "$NIX_GCC_WRAPPER_START_HOOK"
+fi
+
+if test -z "$NIX_GCC_WRAPPER_FLAGS_SET"; then
+    source @out@/nix-support/add-flags.sh
+fi
+
+source @out@/nix-support/utils.sh
+
+
+# Figure out if linker flags should be passed.  GCC prints annoying
+# warnings when they are not needed.
+dontLink=0
+getVersion=0
+nonFlagArgs=0
+
+for i in "$@"; 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
+    elif test "${i:0:1}" != "-"; then
+        nonFlagArgs=1
+    elif test "$i" = "-m32"; then
+        if test -e @out@/nix-support/dynamic-linker-m32; then
+            NIX_LDFLAGS="$NIX_LDFLAGS -dynamic-linker $(cat @out@/nix-support/dynamic-linker-m32)"
+        fi
+    fi
+done
+
+# If we pass a flag like -Wl, then gcc will call the linker unless it
+# can figure out that it has to do something else (e.g., because of a
+# "-c" flag).  So if no non-flag arguments are given, don't pass any
+# linker flags.  This catches cases like "gcc" (should just print
+# "gcc: no input files") and "gcc -v" (should print the version).
+if test "$nonFlagArgs" = "0"; then
+    dontLink=1
+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_CFLAGS_COMPILE)
+extraBefore=()
+
+if test "$dontLink" != "1"; then
+
+    # Add the flags that should only be passed to the compiler when
+    # linking.
+    extraAfter=(${extraAfter[@]} $NIX_CFLAGS_LINK)
+
+    # Add the flags that should be passed to the linker (and prevent
+    # `ld-wrapper' from adding NIX_LDFLAGS again).
+    for i in $NIX_LDFLAGS_BEFORE; do
+        extraBefore=(${extraBefore[@]} "-Wl,$i")
+    done
+    for i in $NIX_LDFLAGS; do
+	if test "${i:0:3}" = "-L/"; then
+	    extraAfter=(${extraAfter[@]} "$i")
+	else
+	    extraAfter=(${extraAfter[@]} "-Wl,$i")
+	fi
+    done
+    export NIX_LDFLAGS_SET=1
+
+    if test "$NIX_STRIP_DEBUG" = "1"; then
+        # Add executable-stripping flags.
+        extraAfter=(${extraAfter[@]} $NIX_CFLAGS_STRIP)
+    fi
+fi
+
+# As a very special hack, if the arguments are just `-v', then don't
+# add anything.  This is to prevent `gcc -v' (which normally prints
+# out the version number and returns exit code 0) from printing out
+# `No input files specified' and returning exit code 1.
+if test "$*" = "-v"; then
+    extraAfter=()
+    extraBefore=()
+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_GCC_WRAPPER_EXEC_HOOK"; then
+    source "$NIX_GCC_WRAPPER_EXEC_HOOK"
+fi
+
+
+# Call the real `gcc'.  Filter out warnings from stderr about unused
+# `-B' flags, since they confuse some programs.  Deep bash magic to
+# apply grep to stderr (by swapping stdin/stderr twice).
+if test -z "$NIX_GCC_NEEDS_GREP"; then
+    @gccProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}
+else
+    (@gccProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]} 3>&2 2>&1 1>&3- \
+        | (grep -v 'file path prefix' || true); exit ${PIPESTATUS[0]}) 3>&2 2>&1 1>&3-
+    exit $?
+fi    

pkgs/build-support/gcc-wrapper2/ld-wrapper.sh

···
+#! @shell@ -e
+
+if test -n "$NIX_LD_WRAPPER_START_HOOK"; then
+    source "$NIX_LD_WRAPPER_START_HOOK"
+fi
+
+if test -z "$NIX_GCC_WRAPPER_FLAGS_SET"; then
+    source @out@/nix-support/add-flags.sh
+fi
+
+source @out@/nix-support/utils.sh
+
+
+# Optionally filter out paths not refering to the store.
+params=("$@")
+if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE" \
+        -a \( -z "$NIX_IGNORE_LD_THROUGH_GCC" -o -z "$NIX_LDFLAGS_SET" \); 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 "$NIX_LDFLAGS_SET"; then
+    extra=(${extra[@]} $NIX_LDFLAGS)
+    extraBefore=(${extraBefore[@]} $NIX_LDFLAGS_BEFORE)
+fi
+
+
+# Add all used dynamic libraries to the rpath.
+if test "$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))
+        elif $(echo "$p" | grep -q '\.so\($\|\.\)'); then
+            path="$(dirname "$p")";
+            addToLibPath "${path}"
+        fi
+        n=$((n + 1))
+    done
+
+    # Second, for each directory in the library search path (-L...),
+    # see if it contains a dynamic library used by a -l... flag.  If
+    # so, add the directory 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 "
+    }
+
+    for i in $libPath; do
+        n=0
+        while test $n -lt ${#allParams[*]}; do
+            p=${allParams[n]}
+            p2=${allParams[$((n+1))]}
+            if test "${p:0:2}" = "-l" -a -f "$i/lib${p:2}.so"; then
+                addToRPath $i
+                break
+            elif test "$p" = "-l" -a -f "$i/lib${p2}"; then
+                # I haven't seen `-l foo', but you never know...
+                addToRPath $i
+                break
+            elif $(echo "$p" | grep -q '\.so\($\|\.\)'); then
+                path="$(dirname "$p")";
+                if test "$path" == "$i"; then
+                  addToRPath $i
+                  break;
+                fi
+            fi
+            n=$((n + 1))
+        done
+            
+    done
+    
+
+    # Finally, add `-rpath' switches.
+    for i in $rpath; do
+        extra=(${extra[@]} -rpath $i)
+    done
+fi
+
+
+# Optionally print debug info.
+if test "$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[@]}

pkgs/build-support/gcc-wrapper2/setup-hook.sh

···
+addCVars () {
+    if test -d $1/include; then
+        export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I$1/include"
+    fi
+
+    if test -d $1/lib64; then
+        export NIX_LDFLAGS="$NIX_LDFLAGS -L$1/lib64"
+    fi
+
+    if test -d $1/lib; then
+        export NIX_LDFLAGS="$NIX_LDFLAGS -L$1/lib"
+    fi
+}
+
+envHooks=(${envHooks[@]} addCVars)
+
+# Note: these come *after* $out in the PATH (see setup.sh).
+
+if test -n "@gcc@"; then
+    addToSearchPath PATH @gcc@/bin
+fi
+
+if test -n "@binutils@"; then
+    addToSearchPath PATH @binutils@/bin
+fi
+
+if test -n "@libc@"; then
+    addToSearchPath PATH @libc@/bin
+fi

pkgs/build-support/gcc-wrapper2/utils.sh

···
+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 \
+        "${p:0:${#NIX_STORE}}" != "$NIX_STORE" -a \
+        "${p:0:4}" != "/tmp" -a \
+        "${p:0:${#NIX_BUILD_TOP}}" != "$NIX_BUILD_TOP"
+}

pkgs/development/tools/build-managers/cmake/setup-hook.sh

···
         cmakeFlags="-DCMAKE_INSTALL_PREFIX=$prefix $cmakeFlags"
     fi
 
+    # Avoid cmake resetting the rpath of binaries, on make install
+    cmakeFlags="-DCMAKE_SKIP_BUILD_RPATH=ON $cmakeFlags"
+
     echo "cmake flags: $cmakeFlags ${cmakeFlagsArray[@]}"
 
     cmake ${cmakeDir:-.} $cmakeFlags ${cmakeFlagsArray[@]}

pkgs/top-level/all-packages.nix

···
 
   gcc43 = useFromStdenv "gcc" gcc43_real;
 
+  gcc43_wrapper2 = wrapGCC2 gcc43.gcc;
+
   gcc43_real = lowPrio (wrapGCC (makeOverridable (import ../development/compilers/gcc-4.3) {
     inherit fetchurl stdenv texinfo gmp mpfr noSysDirs;
     profiledCompiler = true;
···
   };
 
   wrapGCC = wrapGCCWith (import ../build-support/gcc-wrapper) glibc;
+  wrapGCC2 = wrapGCCWith (import ../build-support/gcc-wrapper2) glibc;
 
   # FIXME: This is a specific hack for GCC-UPC.  Eventually, we may
   # want to merge `gcc-upc-wrapper' and `gcc-wrapper'.
···
   };
 
   autopanosiftc = import ../applications/graphics/autopanosiftc {
-    inherit fetchurl stdenv cmake libpng libtiff libjpeg panotools libxml2;
+    inherit fetchurl cmake libpng libtiff libjpeg panotools libxml2;
+    stdenv = overrideGCC stdenv gcc43_wrapper2;
   };
 
   avidemux = import ../applications/video/avidemux {
-    inherit fetchurl stdenv cmake pkgconfig libxml2 qt4 gettext SDL libxslt x264
+    inherit fetchurl cmake pkgconfig libxml2 qt4 gettext SDL libxslt x264
       alsaLib lame faac faad2 libvorbis;
+    stdenv = overrideGCC stdenv gcc43_wrapper2;
     inherit (gtkLibs) gtk;
     inherit (xlibs) libXv pixman libpthreadstubs libXau libXdmcp;
   };
···
   };
 
   freepv = import ../applications/graphics/freepv {
-    inherit fetchurl stdenv mesa freeglut libjpeg zlib cmake libxml2 libpng;
+    inherit fetchurl mesa freeglut libjpeg zlib cmake libxml2 libpng;
+    stdenv = overrideGCC stdenv gcc43_wrapper2;
     inherit (xlibs) libX11 libXxf86vm;
   };
 
···
   };
 
   hugin = import ../applications/graphics/hugin {
-    inherit stdenv fetchurl cmake panotools libtiff libpng boost pkgconfig
+    inherit fetchurl cmake panotools libtiff libpng boost pkgconfig
       exiv2 gettext ilmbase enblendenfuse autopanosiftc;
     inherit wxGTK;
     openexr = openexr_1_6_1;
+    stdenv = overrideGCC stdenv gcc43_wrapper2;
   };
 
   i810switch = import ../applications/misc/i810 {
···
   };
 
   paraview = import ../applications/graphics/paraview {
-    inherit fetchurl stdenv cmake qt4;
+    inherit fetchurl cmake qt4;
+    stdenv = overrideGCC stdenv gcc43_wrapper2;
   };
 
   partitionManager = import ../tools/misc/partition-manager {