diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 98 |
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 |