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/usr/src/gcc-4.7/debian/patches/arm-multilib-defaults.diff is in gcc-4.7-source 4.7.3-12ubuntu1.

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# DP: Set MULTILIB_DEFAULTS for ARM multilib builds

Index: b/src/gcc/config.gcc
===================================================================
--- a/src/gcc/config.gcc
+++ b/src/gcc/config.gcc
@@ -3129,10 +3129,18 @@
 		esac
 
 		case "$with_float" in
-		"" \
-		| soft | hard | softfp)
+		"")
 			# OK
 			;;
+		soft)
+			tm_defines="${tm_defines} TARGET_CONFIGURED_FLOAT_ABI=0"
+			;;
+		softfp)
+			tm_defines="${tm_defines} TARGET_CONFIGURED_FLOAT_ABI=1"
+			;;
+		hard)
+			tm_defines="${tm_defines} TARGET_CONFIGURED_FLOAT_ABI=2"
+			;;
 		*)
 			echo "Unknown floating point type used in --with-float=$with_float" 1>&2
 			exit 1
@@ -3176,6 +3184,9 @@
 		"" \
 		| arm | thumb )
 			#OK
+			if test "$with_mode" = thumb; then
+				tm_defines="${tm_defines} TARGET_CONFIGURED_THUMB_MODE=1"
+			fi
 			;;
 		*)
 			echo "Unknown mode used in --with-mode=$with_mode"
Index: b/src/gcc/config/arm/linux-eabi.h
===================================================================
--- a/src/gcc/config/arm/linux-eabi.h
+++ b/src/gcc/config/arm/linux-eabi.h
@@ -34,7 +34,21 @@
 /* We default to a soft-float ABI so that binaries can run on all
    target hardware.  */
 #undef  TARGET_DEFAULT_FLOAT_ABI
+#ifdef TARGET_CONFIGURED_FLOAT_ABI
+#if TARGET_CONFIGURED_FLOAT_ABI == 2
+#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
+#define MULTILIB_DEFAULT_FLOAT_ABI "mfloat-abi=hard"
+#elif TARGET_CONFIGURED_FLOAT_ABI == 1
+#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFTFP
+#define MULTILIB_DEFAULT_FLOAT_ABI "mfloat-abi=softfp"
+#else
+#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
+#define MULTILIB_DEFAULT_FLOAT_ABI "mfloat-abi=soft"
+#endif
+#else
 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
+#define MULTILIB_DEFAULT_FLOAT_ABI "mfloat-abi=soft"
+#endif
 
 /* We default to the "aapcs-linux" ABI so that enums are int-sized by
    default.  */
@@ -68,6 +82,28 @@
    "%{mfloat-abi=hard:" GLIBC_DYNAMIC_LINKER_HARD_FLOAT "} \
     %{!mfloat-abi=hard:" GLIBC_DYNAMIC_LINKER_SOFT_FLOAT "}"
 
+/* Set the multilib defaults according the configuration, needed to
+   let gcc -print-multi-dir do the right thing.  */
+
+#if TARGET_BIG_ENDIAN_DEFAULT
+#define MULTILIB_DEFAULT_ENDIAN "mbig-endian"
+#else
+#define MULTILIB_DEFAULT_ENDIAN "mlittle-endian"
+#endif
+
+#ifndef TARGET_CONFIGURED_THUMB_MODE
+#define MULTILIB_DEFAULT_MODE "marm"
+#elif TARGET_CONFIGURED_THUMB_MODE == 1
+#define MULTILIB_DEFAULT_MODE "mthumb"
+#else
+#define MULTILIB_DEFAULT_MODE "marm"
+#endif
+
+#undef  MULTILIB_DEFAULTS
+#define MULTILIB_DEFAULTS \
+	{ MULTILIB_DEFAULT_MODE, MULTILIB_DEFAULT_ENDIAN, \
+	  MULTILIB_DEFAULT_FLOAT_ABI, "mno-thumb-interwork" }
+
 /* At this point, bpabi.h will have clobbered LINK_SPEC.  We want to
    use the GNU/Linux version, not the generic BPABI version.  */
 #undef  LINK_SPEC