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/usr/src/gcc-4.9/debian/patches/config-ml.diff is in gcc-4.9-source 4.9.3-13ubuntu2.

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# DP: - Disable some biarch libraries for biarch builds.
# DP: - Fix multilib builds on kernels which don't support all multilibs.

Index: b/src/config-ml.in
===================================================================
--- a/src/config-ml.in
+++ b/src/config-ml.in
@@ -467,6 +467,25 @@ powerpc*-*-* | rs6000*-*-*)
 	;;
 esac
 
+if [ -z "$biarch_multidir_names" ]; then
+  biarch_multidir_names="libiberty libstdc++-v3 libgfortran libmudflap libssp libffi libobjc libgomp"
+  echo "WARNING: biarch_multidir_names is unset. Use default value:"
+  echo "  $biarch_multidir_names"
+fi
+ml_srcbase=`basename $ml_realsrcdir`
+old_multidirs="${multidirs}"
+multidirs=""
+for x in ${old_multidirs}; do
+    case " $x " in
+	" 32 "|" n32 "|" x32 "|" 64 "|" hf "|" sf "|" m4-nofpu ")
+	case "$biarch_multidir_names" in
+	    *"$ml_srcbase"*) multidirs="${multidirs} ${x}" ;;
+	esac
+	;;
+	*) multidirs="${multidirs} ${x}" ;;
+    esac
+done
+
 # Remove extraneous blanks from multidirs.
 # Tests like `if [ -n "$multidirs" ]' require it.
 multidirs=`echo "$multidirs" | sed -e 's/^[ ][ ]*//' -e 's/[ ][ ]*$//' -e 's/[ ][ ]*/ /g'`
@@ -872,9 +891,20 @@ if [ -n "${multidirs}" ] && [ -z "${ml_n
 	fi
     fi
 
+    ml_configure_args=
+    for arg in ${ac_configure_args}
+    do
+      case $arg in
+      *CC=*)  ml_configure_args=${ml_config_env} ;;
+      *CXX=*) ml_configure_args=${ml_config_env} ;;
+      *GCJ=*) ml_configure_args=${ml_config_env} ;;
+      *) ;;
+      esac
+    done
+
     if eval ${ml_config_env} ${ml_config_shell} ${ml_recprog} \
 	--with-multisubdir=${ml_dir} --with-multisrctop=${multisrctop} \
-	${ac_configure_args} ${ml_config_env} ${ml_srcdiroption} ; then
+	${ac_configure_args} ${ml_configure_args} ${ml_host_arg} ${ml_srcdiroption} ; then
       true
     else
       exit 1
Index: b/src/libstdc++-v3/include/Makefile.am
===================================================================
--- a/src/libstdc++-v3/include/Makefile.am
+++ b/src/libstdc++-v3/include/Makefile.am
@@ -844,8 +844,9 @@ c_compatibility_headers_extra =
 endif
 
 host_srcdir = ${glibcxx_srcdir}/$(OS_INC_SRCDIR)
-host_builddir = ./${host_alias}/bits
-host_installdir = ${gxx_include_dir}/${host_alias}$(MULTISUBDIR)/bits
+default_host_alias = @default_host_alias@
+host_builddir = ./${default_host_alias}/bits
+host_installdir = ${gxx_include_dir}/${default_host_alias}$(MULTISUBDIR)/bits
 host_headers = \
 	${host_srcdir}/ctype_base.h \
 	${host_srcdir}/ctype_inline.h \
@@ -1071,6 +1072,7 @@ stamp-profile-impl: ${profile_impl_heade
 stamp-${host_alias}:
 	@-mkdir -p ${host_builddir}
 	@-mkdir -p ${host_builddir}/../ext
+	@test ${default_host_alias} = ${host_alias} || ln -sf ${default_host_alias} ${host_alias}
 	@$(STAMP) stamp-${host_alias}
 
 # Host includes static.
Index: b/src/libstdc++-v3/include/Makefile.in
===================================================================
--- a/src/libstdc++-v3/include/Makefile.in
+++ b/src/libstdc++-v3/include/Makefile.in
@@ -205,6 +205,7 @@ builddir = @builddir@
 check_msgfmt = @check_msgfmt@
 datadir = @datadir@
 datarootdir = @datarootdir@
+default_host_alias = @default_host_alias@
 docdir = @docdir@
 dvidir = @dvidir@
 enable_shared = @enable_shared@
@@ -1105,8 +1106,8 @@ profile_impl_headers = \
 # For --enable-cheaders=c_std
 @GLIBCXX_C_HEADERS_COMPATIBILITY_TRUE@c_compatibility_headers_extra = ${c_compatibility_headers}
 host_srcdir = ${glibcxx_srcdir}/$(OS_INC_SRCDIR)
-host_builddir = ./${host_alias}/bits
-host_installdir = ${gxx_include_dir}/${host_alias}$(MULTISUBDIR)/bits
+host_builddir = ./${default_host_alias}/bits
+host_installdir = ${gxx_include_dir}/${default_host_alias}$(MULTISUBDIR)/bits
 host_headers = \
 	${host_srcdir}/ctype_base.h \
 	${host_srcdir}/ctype_inline.h \
@@ -1490,6 +1491,7 @@ stamp-profile-impl: ${profile_impl_heade
 stamp-${host_alias}:
 	@-mkdir -p ${host_builddir}
 	@-mkdir -p ${host_builddir}/../ext
+	@test ${default_host_alias} = ${host_alias} || ln -sf ${default_host_alias} ${host_alias}
 	@$(STAMP) stamp-${host_alias}
 
 # Host includes static.
Index: b/src/libstdc++-v3/configure.ac
===================================================================
--- a/src/libstdc++-v3/configure.ac
+++ b/src/libstdc++-v3/configure.ac
@@ -476,6 +476,16 @@ else
   multilib_arg=
 fi
 
+AC_ARG_WITH(default-host-alias,
+[AS_HELP_STRING([--with-default-host-alias=TRIPLET],
+                [specifies host triplet used for the default multilib build])],
+[case "${withval}" in
+yes)    AC_MSG_ERROR(bad value ${withval} given for default host triplet) ;;
+no)     default_host_alias='${host_alias}' ;;
+*)      default_host_alias=${withval} ;;
+esac],[default_host_alias='${host_alias}'])
+AC_SUBST(default_host_alias)
+
 # Export all the install information.
 GLIBCXX_EXPORT_INSTALL_INFO