gcc-wrapper: Remove NIX_GCC_NEEDS_GREP

This is not needed on any currently supported platform.

pkgs/build-support/clang-wrapper/clang-wrapper.sh

@@ -138,13 +138,4 @@ if test -n "$NIX_CLANG_WRAPPER_EXEC_HOOK"; then
     source "$NIX_CLANG_WRAPPER_EXEC_HOOK"
 fi
 
-# Call the real `clang'.  Filter out warnings from stderr about unused
+exec @clangProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}
-# `-B' flags, since they confuse some programs.  Deep bash magic to
-# apply grep to stderr (by swapping stdin/stderr twice).
-if test -z "$NIX_CLANG_NEEDS_GREP"; then
-    @clangProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}
-else
-    (@clangProg@ ${extraBefore[@]} "${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-cross-wrapper/gcc-wrapper.sh

@@ -114,13 +114,4 @@ fi
 # We want gcc to call the wrapper linker, not that of binutils.
 export PATH="@ldPath@:$PATH"
 
-# Call the real `gcc'.  Filter out warnings from stderr about unused
+exec @gccProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}
-# `-B' flags, since they confuse some programs.  Deep bash magic to
-# apply grep to stderr (by swapping stdin/stderr twice).
-if test -z "$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-wrapper/gcc-wrapper.sh

@@ -143,14 +143,4 @@ if test -n "$NIX_GCC_WRAPPER_EXEC_HOOK"; then
     source "$NIX_GCC_WRAPPER_EXEC_HOOK"
 fi
 
-
+exec @gccProg@ ${extraBefore[@]} "${params[@]}" "${extraAfter[@]}"
-# Call the real `gcc'.  Filter out warnings from stderr about unused
-# `-B' flags, since they confuse some programs.  Deep bash magic to
-# apply grep to stderr (by swapping stdin/stderr twice).
-if test -z "$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-wrapper/gnat-wrapper.sh

@@ -100,14 +100,4 @@ if test -n "$NIX_GNAT_WRAPPER_EXEC_HOOK"; then
     source "$NIX_GNAT_WRAPPER_EXEC_HOOK"
 fi
 
-
+exec @gnatProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}
-# Call the real `gcc'.  Filter out warnings from stderr about unused
-# `-B' flags, since they confuse some programs.  Deep bash magic to
-# apply grep to stderr (by swapping stdin/stderr twice).
-if test -z "$NIX_GNAT_NEEDS_GREP"; then
-    @gnatProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}
-else
-    (@gnatProg@ ${extraBefore[@]} "${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-wrapper/gnatlink-wrapper.sh

@@ -30,14 +30,4 @@ if test -n "$NIX_GNAT_WRAPPER_EXEC_HOOK"; then
     source "$NIX_GNAT_WRAPPER_EXEC_HOOK"
 fi
 
-
+exec @gnatlinkProg@ ${extraBefore[@]} "$@" ${extraAfter[@]}
-# Call the real `gcc'.  Filter out warnings from stderr about unused
-# `-B' flags, since they confuse some programs.  Deep bash magic to
-# apply grep to stderr (by swapping stdin/stderr twice).
-if test -z "$NIX_GNAT_NEEDS_GREP"; then
-    @gnatlinkProg@ ${extraBefore[@]} "$@" ${extraAfter[@]}
-else
-    (@gnatlinkProg@ ${extraBefore[@]} "$@" ${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/stdenv/native/default.nix

@@ -35,9 +35,6 @@ rec {
     alias sed=gsed
     export MAKE=gmake
     shopt -s expand_aliases
-
-    # Filter out stupid GCC warnings (in gcc-wrapper).
-    export NIX_GCC_NEEDS_GREP=1
   '';
 
   prehookOpenBSD = ''
@@ -52,9 +49,6 @@ rec {
 
     export MAKE=gmake
     shopt -s expand_aliases
-
-    # Filter out stupid GCC warnings (in gcc-wrapper).
-    export NIX_GCC_NEEDS_GREP=1
   '';
 
   prehookNetBSD = ''
@@ -65,9 +59,6 @@ rec {
     alias tar=gtar
     export MAKE=gmake
     shopt -s expand_aliases
-
-    # Filter out stupid GCC warnings (in gcc-wrapper).
-    export NIX_GCC_NEEDS_GREP=1
   '';
 
   prehookCygwin = ''