diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 155 |
1 files changed, 154 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index d8a2948..08bb371 100644 --- a/configure.ac +++ b/configure.ac @@ -26,7 +26,7 @@ AC_PREREQ([2.69]) ## NOTE: Do not forget to change the version number here when we do a ## release!!! ## -AC_INIT([HDF5], [1.9.226], [help@hdfgroup.org]) +AC_INIT([HDF5], [1.9.227], [help@hdfgroup.org]) @@ -2374,6 +2374,27 @@ else fi ## ---------------------------------------------------------------------- +## Decide whether the data accuracy has higher priority during data +## conversions. If not, some hard conversions will still be prefered even +## though the data may be wrong (for example, some compilers don't +## support denormalized floating values) to maximize speed. +## +AC_MSG_CHECKING([whether data accuracy is guaranteed during data conversions]) +AC_ARG_ENABLE([dconv-accuracy], + [AS_HELP_STRING([--enable-dconv-accuracy], + [if data accuracy is guaranteed during + data conversions [default=yes]])], + [DATA_ACCURACY=$enableval], [DATA_ACCURACY=yes]) + +if test "$DATA_ACCURACY" = "yes"; then + AC_MSG_RESULT([yes]) + AC_DEFINE([WANT_DATA_ACCURACY], [1], + [Data accuracy is prefered to speed during data conversions]) +else + AC_MSG_RESULT([no]) +fi + +## ---------------------------------------------------------------------- ## Set the flag to indicate that the machine has window style pathname, ## that is, "drive-letter:\" (e.g. "C:") or "drive-letter:/" (e.g. "C:/"). ## (This flag should be _unset_ for all machines, except for Windows, where @@ -2553,6 +2574,138 @@ else fi ## ---------------------------------------------------------------------- +## Set the flag to indicate that the machine can accurately convert +## 'long double' to '(unsigned) long long' values. (This flag should +## be set for all machines, except for Mac OS 10.4, SGI IRIX64 6.5 and +## Powerpc Linux using XL compilers. +## When the bit sequence of long double is 0x4351ccf385ebc8a0bfcc2a3c..., +## the values of (unsigned)long long start to go wrong on these +## two machines. Adjusting it higher to 0x4351ccf385ebc8a0dfcc... or +## 0x4351ccf385ebc8a0ffcc... will make the converted values wildly wrong. +## This test detects this wrong behavior and disable the test. +## +AC_MSG_CHECKING([if correctly converting long double to (unsigned) long long values]) + +if test ${ac_cv_sizeof_long_double} = 0; then + hdf5_cv_ldouble_to_llong_accurate=${hdf5_cv_ldouble_to_llong_accurate=no} +else + AC_CACHE_VAL([hdf5_cv_ldouble_to_llong_accurate], + [AC_TRY_RUN([ + int main(void) + { + long double ld = 20041683600089727.779961L; + long long ll; + unsigned long long ull; + unsigned char s[16]; + int ret = 0; + + if(sizeof(long double) == 16) { + /*make sure the long double type is the same as the failing type + *which has 16 bytes in size and 11 bits of exponent. If it is, + *the bit sequence should be like below. It's not + *a decent way to check but this info isn't available. */ + memcpy(s, &ld, 16); + if(s[0]==0x43 && s[1]==0x51 && s[2]==0xcc && s[3]==0xf3 && + s[4]==0x85 && s[5]==0xeb && s[6]==0xc8 && s[7]==0xa0 && + s[8]==0xbf && s[9]==0xcc && s[10]==0x2a && s[11]==0x3c) { + + /*slightly adjust the bit sequence (s[8]=0xdf). The converted + *values will go wild on Mac OS 10.4 and IRIX64 6.5.*/ + s[0]=0x43; s[1]=0x51; s[2]=0xcc; s[3]=0xf3; + s[4]=0x85; s[5]=0xeb; s[6]=0xc8; s[7]=0xa0; + s[8]=0xdf; s[9]=0xcc; s[10]=0x2a; s[11]=0x3c; + s[12]=0x3d; s[13]=0x85; s[14]=0x56; s[15]=0x20; + + memcpy(&ld, s, 16); + ll = (long long)ld; + ull = (unsigned long long)ld; + + if(ll != 20041683600089728 || ull != 20041683600089728) + ret = 1; + } + } + done: + exit(ret); + } + ], [hdf5_cv_ldouble_to_llong_accurate=yes], [hdf5_cv_ldouble_to_llong_accurate=no],)]) +fi + +if test ${hdf5_cv_ldouble_to_llong_accurate} = "yes"; then + AC_DEFINE([LDOUBLE_TO_LLONG_ACCURATE], [1], + [Define if your system can convert long double to (unsigned) long long values correctly.]) + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi + + +## ---------------------------------------------------------------------- +## Set the flag to indicate that the machine can accurately convert +## '(unsigned) long long' to 'long double' values. (This flag should be +## set for all machines, except for Mac OS 10.4 and Powerpc Linux using +## XL compilers. +## When the bit sequences are 003fff..., 007fff..., 00ffff..., 01ffff..., +## ..., 7fffff..., the converted values are twice as big as they should be. +## +AC_MSG_CHECKING([if correctly converting (unsigned) long long to long double values]) + +if test ${ac_cv_sizeof_long_double} = 0; then + hdf5_cv_llong_to_ldouble_correct=${hdf5_cv_llong_to_ldouble_correct=no} +else + AC_CACHE_VAL([hdf5_cv_llong_to_ldouble_correct], + [AC_TRY_RUN([ + int main(void) + { + long double ld; + long long ll; + unsigned long long ull; + unsigned char s[16]; + int flag=0, ret=0; + + /*Determine if long double has 16 byte in size, 11 bit exponent, and + *the bias is 0x3ff */ + if(sizeof(long double) == 16) { + ld = 1.0L; + memcpy(s, &ld, 16); + if(s[0]==0x3f && s[1]==0xf0 && s[2]==0x00 && s[3]==0x00 && + s[4]==0x00 && s[5]==0x00 && s[6]==0x00 && s[7]==0x00) + flag = 1; + } + + if(flag==1 && sizeof(long long)==8) { + ll = 0x01ffffffffffffffLL; + ld = (long double)ll; + memcpy(s, &ld, 16); + /*Check if the bit sequence is as supposed to be*/ + if(s[0]!=0x43 || s[1]!=0x7f || s[2]!=0xff || s[3]!=0xff || + s[4]!=0xff || s[5]!=0xff || s[6]!=0xff || s[7]!=0xff || + s[8]!=0xf0 || s[9]!=0x00 || s[10]!=0x00 || s[11]!=0x00) + ret = 1; + } + if(flag==1 && sizeof(unsigned long long)==8) { + ull = 0x01ffffffffffffffULL; + ld = (long double)ull; + memcpy(s, &ld, 16); + if(s[0]!=0x43 || s[1]!=0x7f || s[2]!=0xff || s[3]!=0xff || + s[4]!=0xff || s[5]!=0xff || s[6]!=0xff || s[7]!=0xff || + s[8]!=0xf0 || s[9]!=0x00 || s[10]!=0x00 || s[11]!=0x00) + ret = 1; + } + done: + exit(ret); + } + ], [hdf5_cv_llong_to_ldouble_correct=yes], [hdf5_cv_llong_to_ldouble_correct=no],)]) +fi + +if test ${hdf5_cv_llong_to_ldouble_correct} = "yes"; then + AC_DEFINE([LLONG_TO_LDOUBLE_CORRECT], [1], + [Define if your system can convert (unsigned) long long to long double values correctly.]) + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi + +## ---------------------------------------------------------------------- ## Set some variables for general configuration information to be saved ## and installed with the libraries (used to generate libhdf5.settings). ## |