gentoo: gcc: don't try to sed CFLAGS

Bug: https://bugs.gentoo.org/849722
Bug: InBetweenNames/gentooLTO#846
Bug: vaeth/portage-bashrc-mv#11

gcc/configure

@@ -5473,29 +5473,6 @@ ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ex
 ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
 
-# Remove all -O flags: for historical reasons, unless bootstrapping we prefer
-# optimizations to be activated explicitly by the toplevel.
-case "$CC" in
-  */prev-gcc/xgcc*) ;;
-  *)
-    new_CFLAGS=
-    for flag in $CFLAGS; do
-      case $flag in
-	-O*) ;;
-	*) new_CFLAGS="$new_CFLAGS $flag" ;;
-      esac
-    done
-    CFLAGS=$new_CFLAGS
-    new_CXXFLAGS=
-    for flag in $CXXFLAGS; do
-      case $flag in
-	-O*) ;;
-	*) new_CXXFLAGS="$new_CXXFLAGS $flag" ;;
-      esac
-    done
-    CXXFLAGS=$new_CXXFLAGS
-    ;;
-esac
 
 
 

gcc/configure.ac

@@ -463,29 +463,6 @@ ACX_PROG_GDC([-I"$srcdir"/d])
 # Do configure tests with the C++ compiler, since that's what we build with.
 AC_LANG(C++)
 
-# Remove all -O flags: for historical reasons, unless bootstrapping we prefer
-# optimizations to be activated explicitly by the toplevel.
-case "$CC" in
-  */prev-gcc/xgcc*) ;;
-  *)
-    new_CFLAGS=
-    for flag in $CFLAGS; do
-      case $flag in
-	-O*) ;;
-	*) new_CFLAGS="$new_CFLAGS $flag" ;;
-      esac
-    done
-    CFLAGS=$new_CFLAGS
-    new_CXXFLAGS=
-    for flag in $CXXFLAGS; do
-      case $flag in
-	-O*) ;;
-	*) new_CXXFLAGS="$new_CXXFLAGS $flag" ;;
-      esac
-    done
-    CXXFLAGS=$new_CXXFLAGS
-    ;;
-esac
 AC_SUBST(CFLAGS)
 AC_SUBST(CXXFLAGS)
 AC_SUBST(GDCFLAGS)