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/usr/src/gcc-4.7/debian/patches/gcc-multiarch-no-multilib.diff is in gcc-4.7-source 4.7.4-3ubuntu12.

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# DP: Add MULTIARCH_DIRNAME definitions for multilib configurations,
# DP: which are used for the non-multilib builds.

Index: b/src/gcc/config/sparc/t-linux64
===================================================================
--- a/src/gcc/config/sparc/t-linux64
+++ b/src/gcc/config/sparc/t-linux64
@@ -28,3 +28,5 @@ MULTILIB_OPTIONS = m64/m32
 MULTILIB_DIRNAMES = 64 32
 MULTILIB_OSDIRNAMES = ../lib64$(call if_multiarch,:sparc64-linux-gnu)
 MULTILIB_OSDIRNAMES += $(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:sparc-linux-gnu)
+
+MULTIARCH_DIRNAME = $(call if_multiarch,sparc$(if $(findstring 64,$(target)),64)-linux-gnu)
Index: b/src/gcc/config/s390/t-linux64
===================================================================
--- a/src/gcc/config/s390/t-linux64
+++ b/src/gcc/config/s390/t-linux64
@@ -9,3 +9,5 @@ MULTILIB_OPTIONS = m64/m31
 MULTILIB_DIRNAMES = 64 32
 MULTILIB_OSDIRNAMES = ../lib64$(call if_multiarch,:s390x-linux-gnu)
 MULTILIB_OSDIRNAMES += $(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:s390-linux-gnu)
+
+MULTIARCH_DIRNAME = $(call if_multiarch,s390$(if $(findstring s390x,$(target)),x)-linux-gnu)
Index: b/src/gcc/config/rs6000/t-linux64
===================================================================
--- a/src/gcc/config/rs6000/t-linux64
+++ b/src/gcc/config/rs6000/t-linux64
@@ -34,3 +34,5 @@ MULTILIB_EXCLUSIONS     =
 MULTILIB_OSDIRNAMES	= ../lib64$(call if_multiarch,:powerpc64-linux-gnu)
 MULTILIB_OSDIRNAMES    += $(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:powerpc-linux-gnu)
 MULTILIB_MATCHES        =
+
+MULTIARCH_DIRNAME = $(call if_multiarch,powerpc$(if $(findstring 64,$(target)),64)-linux-gnu)
Index: b/src/gcc/config/i386/t-linux64
===================================================================
--- a/src/gcc/config/i386/t-linux64
+++ b/src/gcc/config/i386/t-linux64
@@ -37,3 +37,13 @@ MULTILIB_DIRNAMES   = $(patsubst m%, %,
 MULTILIB_OSDIRNAMES = m64=../lib64$(call if_multiarch,:x86_64-linux-gnu)
 MULTILIB_OSDIRNAMES+= m32=$(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)$(call if_multiarch,:i386-linux-gnu)
 MULTILIB_OSDIRNAMES+= mx32=../libx32$(call if_multiarch,:x86_64-linux-gnux32)
+
+ifneq (,$(findstring x86_64,$(target)))
+  ifneq (,$(findstring biarchx32.h,$(tm_include_list)))
+  MULTIARCH_DIRNAME = $(call if_multiarch,x86_64-linux-gnux32)
+  else
+  MULTIARCH_DIRNAME = $(call if_multiarch,x86_64-linux-gnu)
+  endif
+else
+  MULTIARCH_DIRNAME = $(call if_multiarch,i386-linux-gnu)
+endif
Index: b/src/gcc/config/i386/t-kfreebsd
===================================================================
--- a/src/gcc/config/i386/t-kfreebsd
+++ b/src/gcc/config/i386/t-kfreebsd
@@ -5,3 +5,5 @@ endif
 # MULTILIB_OSDIRNAMES are set in t-linux64.
 KFREEBSD_OS = $(filter kfreebsd%, $(word 3, $(subst -, ,$(target))))
 MULTILIB_OSDIRNAMES := $(filter-out mx32=%,$(subst linux,$(KFREEBSD_OS),$(MULTILIB_OSDIRNAMES)))
+
+MULTIARCH_DIRNAME := $(subst linux,$(KFREEBSD_OS),$(MULTIARCH_DIRNAME))
Index: b/src/gcc/config/mips/t-linux64
===================================================================
--- a/src/gcc/config/mips/t-linux64
+++ b/src/gcc/config/mips/t-linux64
@@ -24,3 +24,13 @@ MULTILIB_OSDIRNAMES = \
 	../lib32$(call if_multiarch,:mips64$(MIPS_EL)-linux-gnuabin32$(MIPS_SOFT)) \
 	../lib$(call if_multiarch,:mips$(MIPS_EL)-linux-gnu$(MIPS_SOFT)) \
 	../lib64$(call if_multiarch,:mips64$(MIPS_EL)-linux-gnuabi64$(MIPS_SOFT))
+
+ifneq (,$(findstring abin32,$(target)))
+MULTIARCH_DIRNAME = $(call if_multiarch,mips64$(MIPS_EL)-linux-gnuabin32$(MIPS_SOFT))
+else
+ifneq (,$(findstring abi64,$(target)))
+MULTIARCH_DIRNAME = $(call if_multiarch,mips64$(MIPS_EL)-linux-gnuabi64$(MIPS_SOFT))
+else
+MULTIARCH_DIRNAME = $(call if_multiarch,mips$(MIPS_EL)-linux-gnu$(MIPS_SOFT))
+endif
+endif
Index: b/src/gcc/config.gcc
===================================================================
--- a/src/gcc/config.gcc
+++ b/src/gcc/config.gcc
@@ -3610,7 +3610,7 @@ case ${target} in
 	i[34567]86-*-darwin* | x86_64-*-darwin*)
 		;;
 	i[34567]86-*-linux* | x86_64-*-linux*)
-		tmake_file="$tmake_file i386/t-linux"
+		tmake_file="i386/t-linux $tmake_file"
 		;;
 	i[34567]86-*-kfreebsd*-gnu | x86_64-*-kfreebsd*-gnu)
 		tmake_file="$tmake_file i386/t-kfreebsd"