diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 36 |
1 files changed, 31 insertions, 5 deletions
diff --git a/configure.in b/configure.in index 3dfacbc..898bd18 100644 --- a/configure.in +++ b/configure.in @@ -2509,13 +2509,39 @@ fi dnl ----------------------------------------------------------------------- dnl Set flag to indicate that the machine can handle conversion from -dnl long double to integers. (This flag should be set "yes" for all -dnl machines except all SGIs and HP-UX 11.00, where some conversions are +dnl long double to integers. This flag should be set "yes" for all +dnl machines except all SGIs and HP-UX 11.00. For SGIs, some conversions are dnl incorrect and its cache value is set "no" in its config/irix6.x and -dnl irix5.x and config/hpux11.00 files.) -dnl +dnl irix5.x. For HP-UX 11.00, the compiler has 'floating exception' +dnl when converting 'long double' to all integers except 'unsigned long long'. +dnl Other HP-UX systems are unknown yet. (1/8/05 - SLU) + AC_MSG_CHECKING([if accurately converting from long double to integers works]) -AC_CACHE_VAL([hdf5_cv_sw_ldouble_to_integer_works], [hdf5_cv_sw_ldouble_to_integer_works=yes]) + +AC_CACHE_VAL([hdf5_cv_sw_ldouble_to_integer_works], + [AC_TRY_RUN([ + int main(void) + { + void *align; + long double ld= 9701917572145405952.00L; + unsigned char v1; + short v2; + unsigned int v3; + int ret = 0; + + align = (void*)malloc(sizeof(long double)); + memcpy(align, &ld, sizeof(long double)); + + /*For HU-UX11.00, there's floating exception(core dump) when doing some of casting + *from 'long double' to integers*/ + v1=(unsigned char)(*((long double*)align)); + v2=(short)(*((long double*)align)); + v3=(unsigned int)(*((long double*)align)); + +done: + exit(ret); + } + ], [hdf5_cv_sw_ldouble_to_integer_works=yes], [hdf5_cv_sw_ldouble_to_integer_works=no],)]) if test ${hdf5_cv_sw_ldouble_to_integer_works} = "yes"; then AC_DEFINE([SW_LDOUBLE_TO_INTEGER_WORKS], [1], |