--- a/config/rules.mk
+++ b/config/rules.mk
@@ -908,17 +908,17 @@ ifdef ENABLE_STRIP
 	$(STRIP) $@
 endif
 ifdef MOZ_POST_PROGRAM_COMMAND
 	$(MOZ_POST_PROGRAM_COMMAND) $@
 endif
 
 $(HOST_PROGRAM): $(HOST_PROGOBJS) $(HOST_LIBS_DEPS) $(HOST_EXTRA_DEPS) $(GLOBAL_DEPS)
 ifeq (_WINNT,$(GNU_CC)_$(HOST_OS_ARCH))
-	$(HOST_LD) -NOLOGO -OUT:$@ -PDB:$(HOST_PDBFILE) $(HOST_OBJS) $(WIN32_EXE_LDFLAGS) $(HOST_LIBS) $(HOST_EXTRA_LIBS)
+	$(HOST_LD) -NOLOGO -OUT:$@ -PDB:$(HOST_PDBFILE) $(HOST_OBJS) $(WIN32_EXE_LDFLAGS) $(HOST_LDFLAGS) $(HOST_LIBS) $(HOST_EXTRA_LIBS)
 ifdef MSMANIFEST_TOOL
 	@if test -f $@.manifest; then \
 		if test -f "$(srcdir)/$@.manifest"; then \
 			echo "Embedding manifest from $(srcdir)/$@.manifest and $@.manifest"; \
 			mt.exe -NOLOGO -MANIFEST "$(win_srcdir)/$@.manifest" $@.manifest -OUTPUTRESOURCE:$@\;1; \
 		else \
 			echo "Embedding manifest from $@.manifest"; \
 			mt.exe -NOLOGO -MANIFEST $@.manifest -OUTPUTRESOURCE:$@\;1; \

--- a/configure.in
+++ b/configure.in
@@ -196,16 +196,21 @@ case "$target" in
             AS=ml;
             ;;
         x86_64)
             AS=ml64;
             ;;
         esac
     fi
     if test -z "$MIDL"; then MIDL=midl; fi
+
+    # need override this flag since we don't use $(LDFLAGS) for this.
+    if test -z "$HOST_LDFLAGS" ; then
+        HOST_LDFLAGS=" "
+    fi
     ;;
 *-darwin*)
     # we prefer gcc-4.2 over gcc on older darwin, so
     # use that specific version if it's available.
     MOZ_PATH_PROGS(CC, $CC gcc-4.2 gcc)
     MOZ_PATH_PROGS(CXX, $CXX g++-4.2 g++)
     ;;
 esac
@@ -2198,17 +2203,25 @@ case "$host" in
     HOST_BIN_SUFFIX=.exe
     case "$host" in
     *mingw*)
         PERL="/bin/sh ${_topsrcdir}/build/msys-perl-wrapper"
         ;;
     esac
 
     case "${host_cpu}" in
+    i*86)
+        if test -n "$_WIN32_MSVC"; then
+            HOST_LDFLAGS="$HOST_LDFLAGS -MACHINE:X86"
+        fi
+        ;;
     x86_64)
+        if test -n "$_WIN32_MSVC"; then
+            HOST_LDFLAGS="$HOST_LDFLAGS -MACHINE:X64"
+        fi
         HOST_CFLAGS="$HOST_CFLAGS -D_AMD64_"
         ;;
     esac
     ;;
 
 *-darwin*)
     HOST_CFLAGS="$HOST_CFLAGS -DXP_UNIX -DXP_MACOSX -DNO_X11"
     HOST_NSPR_MDCPUCFG='\"md/_darwin.cfg\"'
@@ -2677,22 +2690,26 @@ ia64*-hpux*)
             LDFLAGS="$LDFLAGS -SAFESEH"
         fi
 
         if test -n "$GNU_CC"; then
             CFLAGS="$CFLAGS -mstackrealign -fno-keep-inline-dllexport"
             CXXFLAGS="$CXXFLAGS -mstackrealign -fno-keep-inline-dllexport"
         else
             AC_DEFINE(HAVE_STDCALL)
+            DSO_LDOPTS="$DSO_LDOPTS -MACHINE:X86"
         fi
 
         MOZ_CHECK_HEADERS(mmintrin.h)
     	AC_DEFINE(_X86_)
 	;;
     x86_64-*)
+        if test -n "$_WIN32_MSVC"; then
+            DSO_LDOPTS="$DSO_LDOPTS -MACHINE:X64"
+        fi
         AC_DEFINE(_AMD64_)
         ;;
     *)
     	AC_DEFINE(_CPU_ARCH_NOT_DEFINED)
 	;;
     esac
 
     if test "$HAVE_64BIT_OS"; then

--- a/js/src/config/rules.mk
+++ b/js/src/config/rules.mk
@@ -908,17 +908,17 @@ ifdef ENABLE_STRIP
 	$(STRIP) $@
 endif
 ifdef MOZ_POST_PROGRAM_COMMAND
 	$(MOZ_POST_PROGRAM_COMMAND) $@
 endif
 
 $(HOST_PROGRAM): $(HOST_PROGOBJS) $(HOST_LIBS_DEPS) $(HOST_EXTRA_DEPS) $(GLOBAL_DEPS)
 ifeq (_WINNT,$(GNU_CC)_$(HOST_OS_ARCH))
-	$(HOST_LD) -NOLOGO -OUT:$@ -PDB:$(HOST_PDBFILE) $(HOST_OBJS) $(WIN32_EXE_LDFLAGS) $(HOST_LIBS) $(HOST_EXTRA_LIBS)
+	$(HOST_LD) -NOLOGO -OUT:$@ -PDB:$(HOST_PDBFILE) $(HOST_OBJS) $(WIN32_EXE_LDFLAGS) $(HOST_LDFLAGS) $(HOST_LIBS) $(HOST_EXTRA_LIBS)
 ifdef MSMANIFEST_TOOL
 	@if test -f $@.manifest; then \
 		if test -f "$(srcdir)/$@.manifest"; then \
 			echo "Embedding manifest from $(srcdir)/$@.manifest and $@.manifest"; \
 			mt.exe -NOLOGO -MANIFEST "$(win_srcdir)/$@.manifest" $@.manifest -OUTPUTRESOURCE:$@\;1; \
 		else \
 			echo "Embedding manifest from $@.manifest"; \
 			mt.exe -NOLOGO -MANIFEST $@.manifest -OUTPUTRESOURCE:$@\;1; \

--- a/js/src/configure.in
+++ b/js/src/configure.in
@@ -189,16 +189,21 @@ case "$target" in
             AS=ml;
             ;;
         x86_64)
             AS=ml64;
             ;;
         esac
     fi
     if test -z "$MIDL"; then MIDL=midl; fi
+
+    # need override this flag since we don't use $(LDFLAGS) for this.
+    if test -z "$HOST_LDFLAGS" ; then
+        HOST_LDFLAGS=" "
+    fi
     ;;
 *-darwin*)
     # prefer gcc-4.2 to default cc on older xcode
     MOZ_PATH_PROGS(CC, $CC gcc-4.2 gcc)
     MOZ_PATH_PROGS(CXX, $CXX g++-4.2 g++)
     ;;
 esac
 fi
@@ -2039,17 +2044,25 @@ case "$host" in
     HOST_BIN_SUFFIX=.exe
     case "$host" in
     *mingw*)
         PERL="/bin/sh ${_topsrcdir}/build/msys-perl-wrapper"
         ;;
     esac
 
     case "${host_cpu}" in
+    i*86)
+        if test -n "$_WIN32_MSVC"; then
+            HOST_LDFLAGS="$HOST_LDFLAGS -MACHINE:X86"
+        fi
+        ;;
     x86_64)
+        if test -n "$_WIN32_MSVC"; then
+            HOST_LDFLAGS="$HOST_LDFLAGS -MACHINE:X64"
+        fi
         HOST_CFLAGS="$HOST_CFLAGS -D_AMD64_"
         ;;
     esac
     ;;
 
 *-darwin*)
     HOST_CFLAGS="$HOST_CFLAGS -DXP_UNIX -DXP_MACOSX -DNO_X11"
     HOST_NSPR_MDCPUCFG='\"md/_darwin.cfg\"'
@@ -2486,22 +2499,27 @@ ia64*-hpux*)
 
         if test $_MSC_VER -ge 1400; then
             LDFLAGS="$LDFLAGS -SAFESEH"
         fi
 
         if test -n "$GNU_CC"; then
             CFLAGS="$CFLAGS -mstackrealign -fno-keep-inline-dllexport"
             CXXFLAGS="$CXXFLAGS -mstackrealign -fno-keep-inline-dllexport"
+        else
+            DSO_LDOPTS="$DSO_LDOPTS -MACHINE:X86"
         fi
 
         MOZ_CHECK_HEADERS(mmintrin.h)
     	AC_DEFINE(_X86_)
 	;;
     x86_64-*)
+        if test -n "$_WIN32_MSVC"; then
+            DSO_LDOPTS="$DSO_LDOPTS -MACHINE:X64"
+        fi
         AC_DEFINE(_AMD64_)
         ;;
     *)
     	AC_DEFINE(_CPU_ARCH_NOT_DEFINED)
 	;;
     esac
 
     if test "$HAVE_64BIT_OS"; then