Resolve issue with Canadian build for x86_64-w64-mingw32 multilibs

diff --git a/gcc/configure b/gcc/configure
index 996046f5198..db9a5c8f40b 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -20631,6 +20631,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -20638,8 +20651,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -24359,6 +24373,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -24366,8 +24393,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libatomic/configure b/libatomic/configure
index d579bab96f8..bf5e3858f94 100755
--- a/libatomic/configure
+++ b/libatomic/configure
@@ -10518,6 +10518,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -10525,8 +10538,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libbacktrace/configure b/libbacktrace/configure
index 7ade966b54d..079beeceb28 100755
--- a/libbacktrace/configure
+++ b/libbacktrace/configure
@@ -10694,6 +10694,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -10701,8 +10714,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libcc1/configure b/libcc1/configure
index ea689a353c8..dc305bbe00c 100755
--- a/libcc1/configure
+++ b/libcc1/configure
@@ -9952,6 +9952,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -9959,8 +9972,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -14086,6 +14100,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -14093,8 +14120,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libffi/configure b/libffi/configure
index f82a45b13bc..dd7d7037212 100755
--- a/libffi/configure
+++ b/libffi/configure
@@ -10750,6 +10750,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -10757,8 +10770,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -14478,6 +14492,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -14485,8 +14512,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libgfortran/configure b/libgfortran/configure
index 774dd52fc95..29348fd8d4f 100755
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -11896,6 +11896,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -11903,8 +11916,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -15742,6 +15756,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -15749,8 +15776,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libgm2/configure b/libgm2/configure
index 02a427d6ba5..a57a0be802a 100755
--- a/libgm2/configure
+++ b/libgm2/configure
@@ -13542,6 +13542,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -13549,8 +13562,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -17294,6 +17308,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -17301,8 +17328,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libgo/config/libtool.m4 b/libgo/config/libtool.m4
index 4ca90ee71bc..f01d0c832a0 100644
--- a/libgo/config/libtool.m4
+++ b/libgo/config/libtool.m4
@@ -2219,6 +2219,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -2226,8 +2239,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libgo/configure b/libgo/configure
index db371bc76f1..84ff9148f5b 100755
--- a/libgo/configure
+++ b/libgo/configure
@@ -10633,6 +10633,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -10640,8 +10653,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libgomp/configure b/libgomp/configure
index b3646c9936d..2eea8b8553a 100755
--- a/libgomp/configure
+++ b/libgomp/configure
@@ -10531,6 +10531,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -10538,8 +10551,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -14247,6 +14261,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -14254,8 +14281,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libgrust/configure b/libgrust/configure
index e778a253915..32399187acf 100755
--- a/libgrust/configure
+++ b/libgrust/configure
@@ -11699,6 +11699,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -11706,8 +11719,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -15451,6 +15465,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -15458,8 +15485,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libitm/configure b/libitm/configure
index 9ba7fb03a57..71616510d96 100755
--- a/libitm/configure
+++ b/libitm/configure
@@ -11193,6 +11193,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -11200,8 +11213,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -14921,6 +14935,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -14928,8 +14955,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libobjc/configure b/libobjc/configure
index 68172549137..3a818a95d2a 100755
--- a/libobjc/configure
+++ b/libobjc/configure
@@ -9920,6 +9920,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -9927,8 +9940,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libphobos/configure b/libphobos/configure
index 9a59bad34ac..360c1604d80 100755
--- a/libphobos/configure
+++ b/libphobos/configure
@@ -10929,6 +10929,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -10936,8 +10949,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libquadmath/configure b/libquadmath/configure
index 49d70809218..94647e9460c 100755
--- a/libquadmath/configure
+++ b/libquadmath/configure
@@ -9966,6 +9966,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -9973,8 +9986,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libsanitizer/configure b/libsanitizer/configure
index 6bfd28916d2..2ac8bf793ac 100755
--- a/libsanitizer/configure
+++ b/libsanitizer/configure
@@ -11537,6 +11537,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -11544,8 +11557,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -15265,6 +15279,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -15272,8 +15299,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libssp/configure b/libssp/configure
index a31b69f306e..42131911f4f 100755
--- a/libssp/configure
+++ b/libssp/configure
@@ -10151,6 +10151,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -10158,8 +10171,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index bef2b840a59..d98cfc6f205 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -11322,6 +11322,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -11329,8 +11342,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -15074,6 +15088,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -15081,8 +15108,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libtool.m4 b/libtool.m4
index add2d4a1e23..a826610b636 100644
--- a/libtool.m4
+++ b/libtool.m4
@@ -2293,6 +2293,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -2300,8 +2313,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/libvtv/configure b/libvtv/configure
index a7889161c50..9d037b5398d 100755
--- a/libvtv/configure
+++ b/libvtv/configure
@@ -11431,6 +11431,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -11438,8 +11451,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
@@ -15159,6 +15173,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -15166,8 +15193,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/lto-plugin/configure b/lto-plugin/configure
index 28f5dd79cd7..0ef03916c88 100755
--- a/lto-plugin/configure
+++ b/lto-plugin/configure
@@ -11303,6 +11303,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -11310,8 +11323,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'
diff --git a/zlib/configure b/zlib/configure
index 92c462d04c6..57e433c41a4 100755
--- a/zlib/configure
+++ b/zlib/configure
@@ -9898,6 +9898,19 @@  cygwin* | mingw* | pw32* | cegcc*)
   yes,cygwin* | yes,mingw* | yes,pw32* | yes,cegcc*)
     library_names_spec='$libname.dll.a'
     # DLL is installed to $(libdir)/../bin by postinstall_cmds
+    # If user builds GCC with mulitlibs enabled,
+    # it should just install on $(libdir)
+    # not on $(libdir)/../bin or 32 bits dlls would override 64 bit ones.
+    if test ${multilib} = yes; then
+    postinstall_cmds='base_file=`basename \${file}`~
+      dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
+      dldir=$destdir/`dirname \$dlpath`~
+      $install_prog $dir/$dlname $destdir/$dlname~
+      chmod a+x $destdir/$dlname~
+      if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
+	eval '\''$striplib $destdir/$dlname'\'' || exit \$?;
+      fi'
+    else
     postinstall_cmds='base_file=`basename \${file}`~
       dlpath=`$SHELL 2>&1 -c '\''. $dir/'\''\${base_file}'\''i; echo \$dlname'\''`~
       dldir=$destdir/`dirname \$dlpath`~
@@ -9905,8 +9918,9 @@  cygwin* | mingw* | pw32* | cegcc*)
       $install_prog $dir/$dlname \$dldir/$dlname~
       chmod a+x \$dldir/$dlname~
       if test -n '\''$stripme'\'' && test -n '\''$striplib'\''; then
-        eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
+	eval '\''$striplib \$dldir/$dlname'\'' || exit \$?;
       fi'
+    fi
     postuninstall_cmds='dldll=`$SHELL 2>&1 -c '\''. $file; echo \$dlname'\''`~
       dlpath=$dir/\$dldll~
        $RM \$dlpath'