hdf5/hdf5-ldouble-ppc64le.patch

Index: hdf5-1.8.12/configure
===================================================================
--- hdf5-1.8.12/configure.orig
+++ hdf5-1.8.12/configure
@@ -30364,6 +30364,13 @@ else
             unsigned char       s2[8];
             int                 ret = 1;
 
+#if defined __powerpc64__ && defined _LITTLE_ENDIAN
+	    /* Don't bother checking on ppc64le, we know it'll work, and 
+	       that what hdf5 calls 'special algorithm' simply is
+	       IBM ldouble 128 (i.e. two seperately scaled doubles).
+	       The check below assumes big endian.  */
+	    ret = 0;
+#endif
             if(sizeof(long double) == 16 && sizeof(long) == 8) {
                 /*make sure the long double type has 16 bytes in size and
                  * 11 bits of exponent.  If it is,
@@ -30468,6 +30475,13 @@ else
             unsigned char       s[16];
             int                 flag=0, ret=1;
 
+#if defined __powerpc64__ && defined _LITTLE_ENDIAN
+	    /* Don't bother checking on ppc64le, we know it'll work, and 
+	       that what hdf5 calls 'special algorithm' simply is
+	       IBM ldouble 128 (i.e. two seperately scaled doubles).
+	       The check below assumes big endian.  */
+	    ret = 0;
+#endif
             /*Determine if long double has 16 byte in size, 11 bit exponent, and
              *the bias is 0x3ff */
             if(sizeof(long double) == 16) {
Index: hdf5-1.8.12/configure.ac
===================================================================
--- hdf5-1.8.12/configure.ac.orig
+++ hdf5-1.8.12/configure.ac
@@ -3768,6 +3768,13 @@ else
             unsigned char       s2[8];
             int                 ret = 1;
             
+#if defined __powerpc64__ && defined _LITTLE_ENDIAN
+	    /* Don't bother checking on ppc64le, we know it'll work, and 
+	       that what hdf5 calls 'special algorithm' simply is
+	       IBM ldouble 128 (i.e. two seperately scaled doubles).
+	       The check below assumes big endian.  */
+	    ret = 0;
+#endif
             if(sizeof(long double) == 16 && sizeof(long) == 8) {
                 /*make sure the long double type has 16 bytes in size and 
                  * 11 bits of exponent.  If it is,
@@ -3846,6 +3853,13 @@ else
             unsigned char       s[16];
             int                 flag=0, ret=1;
         
+#if defined __powerpc64__ && defined _LITTLE_ENDIAN
+	    /* Don't bother checking on ppc64le, we know it'll work, and 
+	       that what hdf5 calls 'special algorithm' simply is
+	       IBM ldouble 128 (i.e. two seperately scaled doubles).
+	       The check below assumes big endian.  */
+	    ret = 0;
+#endif
             /*Determine if long double has 16 byte in size, 11 bit exponent, and
              *the bias is 0x3ff */ 
             if(sizeof(long double) == 16) { 
Index: hdf5-1.8.12/test/dt_arith.c
===================================================================
--- hdf5-1.8.12/test/dt_arith.c.orig
+++ hdf5-1.8.12/test/dt_arith.c
@@ -3072,7 +3072,18 @@ test_conv_flt_1 (const char *name, int r
                         buf, saved, nelmts);
 #if H5_SIZEOF_LONG_DOUBLE!=H5_SIZEOF_DOUBLE && H5_SIZEOF_LONG_DOUBLE!=0
             } else if(src_type == FLT_LDOUBLE) {
-                 INIT_FP_SPECIAL(src_size, src_nbits, sendian, LDBL_MANT_DIG, dst_size,
+		 size_t mant_dig = LDBL_MANT_DIG;
+		 if (mant_dig >= src_nbits) {
+		     /* This happens for IBM long double in little endian.
+		        The macro LDBL_MANT_DIG says 106 mantissa bits, but the
+			HDF5 detection code actually represents it as a normal 64bit
+			double (52 bit mantissa) with the upper double being 
+			unspec bits (which is sort of okay as the testsuite
+			wouldn't deal with that format correctly anyway).  So
+			override the mantissa size.  */
+		     mant_dig = 52;
+		 }
+                 INIT_FP_SPECIAL(src_size, src_nbits, sendian, mant_dig, dst_size,
                         buf, saved, nelmts);
 #endif
             } else
@@ -3808,7 +3819,18 @@ test_conv_int_fp(const char *name, int r
             INIT_FP_DENORM(long double, LDBL_MANT_DIG, src_size, src_nbits, sendian, dst_size,
                     buf, saved, nelmts);
         } else {
-            INIT_FP_SPECIAL(src_size, src_nbits, sendian, LDBL_MANT_DIG, dst_size, buf, saved, nelmts);
+	    size_t mant_dig = LDBL_MANT_DIG;
+	    if (mant_dig >= src_nbits) {
+		/* This happens for IBM long double in little endian.
+		   The macro LDBL_MANT_DIG says 106 mantissa bits, but the
+		   HDF5 detection code actually represents it as a normal 64bit
+		   double (52 bit mantissa) with the upper double being 
+		   unspec bits (which is sort of okay as the testsuite
+		   wouldn't deal with that format correctly anyway).  So
+		   override the mantissa size.  */
+		mant_dig = 52;
+	    }
+            INIT_FP_SPECIAL(src_size, src_nbits, sendian, mant_dig, dst_size, buf, saved, nelmts);
         }
 #endif
     } else