make/lib/CoreLibraries.gmk

rev 12066 : 8172053: (ppc64) Downport of 8170153 breaks build on linux/ppc64 (big endian)

*** 40,60 ****
      BUILD_LIBFDLIBM_OPTIMIZATION := HIGH
    endif
  endif
  
  ifneq ($(OPENJDK_TARGET_OS), macosx)
    $(eval $(call SetupNativeCompilation,BUILD_LIBFDLIBM, \
        STATIC_LIBRARY := fdlibm, \
        OUTPUT_DIR := $(JDK_OUTPUTDIR)/objs, \
        SRC := $(JDK_TOPDIR)/src/share/native/java/lang/fdlibm/src, \
        LANG := C, \
        OPTIMIZATION := $(BUILD_LIBFDLIBM_OPTIMIZATION), \
        CFLAGS := $(CFLAGS_JDKLIB) \
            -I$(JDK_TOPDIR)/src/share/native/java/lang/fdlibm/include, \
        CFLAGS_windows_debug := -DLOGGING, \
        CFLAGS_aix := -qfloat=nomaf, \
!       CFLAGS_linux_ppc64 := -ffp-contract=off, \
        CFLAGS_linux_ppc64le := -ffp-contract=off, \
        ARFLAGS := $(ARFLAGS), \
        OBJECT_DIR := $(JDK_OUTPUTDIR)/objs/libfdlibm, \
        DEBUG_SYMBOLS := $(DEBUG_ALL_BINARIES)))
  
--- 40,65 ----
      BUILD_LIBFDLIBM_OPTIMIZATION := HIGH
    endif
  endif
  
  ifneq ($(OPENJDK_TARGET_OS), macosx)
+   # Unfortunately, '-ffp-contract' is only available since gcc 4.6. For ppc64le
+   # that's no problem since ppc64le support only appeared in gcc 4.8.3. But on
+   # ppc64 (big endian) we traditionally compiled with gcc 4.3 which only knows
+   # '-mno-fused-madd'. However, that's still not enough to get the float
+   # computations right - we additionally have to supply '-fno-strict-aliasing'.
    $(eval $(call SetupNativeCompilation,BUILD_LIBFDLIBM, \
        STATIC_LIBRARY := fdlibm, \
        OUTPUT_DIR := $(JDK_OUTPUTDIR)/objs, \
        SRC := $(JDK_TOPDIR)/src/share/native/java/lang/fdlibm/src, \
        LANG := C, \
        OPTIMIZATION := $(BUILD_LIBFDLIBM_OPTIMIZATION), \
        CFLAGS := $(CFLAGS_JDKLIB) \
            -I$(JDK_TOPDIR)/src/share/native/java/lang/fdlibm/include, \
        CFLAGS_windows_debug := -DLOGGING, \
        CFLAGS_aix := -qfloat=nomaf, \
!       CFLAGS_linux_ppc64 := -mno-fused-madd -fno-strict-aliasing, \
        CFLAGS_linux_ppc64le := -ffp-contract=off, \
        ARFLAGS := $(ARFLAGS), \
        OBJECT_DIR := $(JDK_OUTPUTDIR)/objs/libfdlibm, \
        DEBUG_SYMBOLS := $(DEBUG_ALL_BINARIES)))