56 строки
1.5 KiB
Plaintext
56 строки
1.5 KiB
Plaintext
# This has been taken from postgres-9.1+ local macros
|
|
# ( REL9_1_BETA2-1484-g293ec33 )
|
|
|
|
# PGAC_TYPE_64BIT_INT(TYPE)
|
|
# -------------------------
|
|
# Check if TYPE is a working 64 bit integer type. Set HAVE_TYPE_64 to
|
|
# yes or no respectively, and define HAVE_TYPE_64 if yes.
|
|
AC_DEFUN([PGAC_TYPE_64BIT_INT],
|
|
[define([Ac_define], [translit([have_$1_64], [a-z *], [A-Z_P])])dnl
|
|
define([Ac_cachevar], [translit([pgac_cv_type_$1_64], [ *], [_p])])dnl
|
|
AC_CACHE_CHECK([whether $1 is 64 bits], [Ac_cachevar],
|
|
[AC_TRY_RUN(
|
|
[typedef $1 ac_int64;
|
|
|
|
/*
|
|
* These are globals to discourage the compiler from folding all the
|
|
* arithmetic tests down to compile-time constants.
|
|
*/
|
|
ac_int64 a = 20000001;
|
|
ac_int64 b = 40000005;
|
|
|
|
int does_int64_work()
|
|
{
|
|
ac_int64 c,d;
|
|
|
|
if (sizeof(ac_int64) != 8)
|
|
return 0; /* definitely not the right size */
|
|
|
|
/* Do perfunctory checks to see if 64-bit arithmetic seems to work */
|
|
c = a * b;
|
|
d = (c + b) / b;
|
|
if (d != a+1)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
main() {
|
|
if (does_int64_work())
|
|
exit(0);
|
|
exit(-1);
|
|
}],
|
|
[Ac_cachevar=yes],
|
|
[Ac_cachevar=no],
|
|
[# If cross-compiling, check the size reported by the compiler and
|
|
# trust that the arithmetic works.
|
|
AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([], [sizeof($1) == 8])],
|
|
Ac_cachevar=yes,
|
|
Ac_cachevar=no)])])
|
|
|
|
Ac_define=$Ac_cachevar
|
|
if test x"$Ac_cachevar" = xyes ; then
|
|
AC_DEFINE(Ac_define, 1, [Define to 1 if `]$1[' works and is 64 bits.])
|
|
fi
|
|
undefine([Ac_define])dnl
|
|
undefine([Ac_cachevar])dnl
|
|
])# PGAC_TYPE_64BIT_INT
|