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make/lib/CoreLibraries.gmk
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rev 12066 : 8172053: (ppc64) Downport of 8170153 breaks build on linux/ppc64 (big endian)
@@ -40,21 +40,26 @@
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 := -ffp-contract=off, \
+ 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)))
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