Modified Makefile and build_tools/build_detect_platform to compile on Linux s390x.

Makefile

@@ -86,10 +86,12 @@ ifneq ($(DEBUG_LEVEL), 2)
 OPT += -O2 -fno-omit-frame-pointer
 ifeq (,$(findstring ppc64,$(MACHINE))) # ppc64[le] doesn't support -momit-leaf-frame-pointer
 ifneq ($(MACHINE),armv7l)
+ifneq ($(MACHINE),s390x)
 OPT += -momit-leaf-frame-pointer
 endif
 endif
 endif
+endif
 
 # if we're compiling for release, compile without debug code (-DNDEBUG) and
 # don't treat warnings as errors

build_tools/build_detect_platform

@@ -360,6 +360,8 @@ fi
 if test "$USE_SSE"; then
   # if Intel SSE instruction set is supported, set USE_SSE=1
   COMMON_FLAGS="$COMMON_FLAGS -msse -msse4.2 "
+elif [ "$TARGET_ARCHITECTURE" = s390x ]; then
+  COMMON_FLAGS="$COMMON_FLAGS -march=z10 "
 elif test -z "$PORTABLE"; then
   if test -n "`echo $TARGET_ARCHITECTURE | grep ^ppc64`"; then
     # Tune for this POWER processor, treating '+' models as base models