summaryrefslogtreecommitdiffstats
path: root/configure.ac
diff options
context:
space:
mode:
Diffstat (limited to 'configure.ac')
-rw-r--r--configure.ac98
1 files changed, 0 insertions, 98 deletions
diff --git a/configure.ac b/configure.ac
index 2e60e8d..e0ade40 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2443,104 +2443,6 @@ case "`uname`" in
esac
## ----------------------------------------------------------------------
-## Set the flag to indicate that the machine can convert from
-## 'unsigned long long' to 'long double' without precision loss.
-## (This flag should be set for all machines, except for FreeBSD(sleipnir)
-## where the last 2 bytes of mantissa are lost when compiler tries to do
-## the conversion, and Cygwin where compiler doesn't do rounding correctly.)
-##
-AC_MSG_CHECKING([if converting unsigned long long to long double with precision])
-
-if test ${ac_cv_sizeof_long_double} = 0; then
- hdf5_cv_ullong_to_ldouble_precision=${hdf5_cv_ullong_to_ldouble_precision=no}
-else
- AC_CACHE_VAL([hdf5_cv_ullong_to_ldouble_precision],
- [AC_TRY_RUN([
- #include <stdlib.h>
- #include <string.h>
-
- int main(void)
- {
- /* General variables */
- int endian;
- int tst_value = 1;
- int ret = 0;
-
- /* For FreeBSD */
- unsigned long long l = 0xa601e80bda85fcefULL;
- long double ld;
- unsigned char *c1, *c2;
- size_t size;
-
- /* For Cygwin */
- unsigned long long l_cyg = 0xfffffffffffffff0ULL;
- long double ld_cyg;
- unsigned char *c2_cyg;
- size_t size_cyg;
-
-
- /* Determine this system's endianess */
- c1 = (unsigned char*)calloc(1, sizeof(int));
- memcpy((void*)c1, &tst_value, sizeof(int));
- if(c1[0]==1)
- endian = 0; /* little endian */
- else
- endian = 1; /* big endian */
-
- /* For FreeBSD */
- size = sizeof(long double);
- memset(&ld, 0, size);
- ld = (long double)l;
-
- c2 = (unsigned char*)calloc(1, size);
- memcpy((void*)c2, &ld, size);
-
- /* Test if the last 2 bytes of mantissa are lost. Mainly for FreeBSD on Intel
- * architecture(sleipnir) where it happens. */
- /*if(endian==0 && c2[0]==0 && c2[1]==0)*/ /*little endian*/
- if(endian==0 && c2[0]==0) { /*little endian*/
- ret = 1;
- goto done;
- }
-
- /* For Cygwin */
- size_cyg = sizeof(long double);
- memset(&ld_cyg, 0, size);
- ld_cyg = (long double)l_cyg;
-
- c2_cyg = (unsigned char*)calloc(1, size_cyg);
- memcpy((void*)c2_cyg, &ld_cyg, size_cyg);
-
- /* Test if the last 4 bytes(roughly) of mantissa are rounded up. Mainly for Cygwin
- * where the values like 0xffffffffffffffff, 0xfffffffffffffffe, ...,
- * 0xfffffffffffff000 ... are rounded up as 0x0000403f8000000000000000
- * instead of 0x0000403effffffffffffffff, 0x0000403efffffffffffffffe, ...,
- * 0x0000403efffffffffffff000 ...
- */
- if(endian==0 && c2_cyg[0]==0 && c2_cyg[1]==0 && c2_cyg[2]==0 && c2_cyg[3]==0)
- ret = 1;
-
- done:
- if(c1)
- free(c1);
- if(c2)
- free(c2);
- if(c2_cyg)
- free(c2_cyg);
- exit(ret);
- }
- ], [hdf5_cv_ullong_to_ldouble_precision=yes], [hdf5_cv_ullong_to_ldouble_precision=no],)])
-fi
-
-if test ${hdf5_cv_ullong_to_ldouble_precision} = "yes"; then
- AC_DEFINE([ULLONG_TO_LDOUBLE_PRECISION], [1],
- [Define if your system can convert unsigned long long to long double with correct precision.])
- AC_MSG_RESULT([yes])
-else
- AC_MSG_RESULT([no])
-fi
-
-## ----------------------------------------------------------------------
## Set the flag to indicate that the machine can handle overflow converting
## all floating-point to all integer types.
## (This flag should be set for all machines, except for Cray X1 where