AM_PROG_LEX
AC_PROG_YACC
-dnl Check for data types which are needed by the hash function
-dnl (golden_ratio_hash).
-AC_CHECK_SIZEOF(int)
-AC_CHECK_SIZEOF(long)
-AC_CHECK_SIZEOF(long long)
-AC_CHECK_SIZEOF(void *)
dnl Switch to C++ language mode for the following libraries and headers.
AC_LANG([C++])
dnl Make sure all the necessary standard headers are installed on the system.
GINAC_STD_CXX_HEADERS
+dnl Check for data types which are needed by the hash function
+dnl (golden_ratio_hash).
+AC_CHECK_TYPE(long long)
+
dnl Check for stuff needed for building the GiNaC interactive shell (ginsh).
AC_CHECK_HEADERS(unistd.h)
GINAC_HAVE_RUSAGE
{
// This function works much better when fast arithmetic with at
// least 64 significant bits is available.
-#if SIZEOF_LONG >= 8
+ if (sizeof(long) >= 8) {
// So 'long' has 64 bits. Excellent! We prefer it because it might be
// more efficient than 'long long'.
unsigned long l = n * 0x4f1bbcddUL;
return (unsigned)l;
-#elif SIZEOF_LONG_LONG >= 8
+ }
+#ifdef HAVE_LONG_LONG
+ else if (sizeof(long long) >= 8) {
// This requires 'long long' (or an equivalent 64 bit type)---which is,
// unfortunately, not ANSI-C++-compliant.
// (Yet C99 demands it, which is reason for hope.)
unsigned long long l = n * 0x4f1bbcddULL;
return (unsigned)l;
-#else
+ }
+#endif
// Without a type with 64 significant bits do the multiplication manually
// by splitting n up into the lower and upper two bytes.
const unsigned n0 = (n & 0x0000ffffU);
const unsigned n1 = (n & 0xffff0000U) >> 16;
return (n0 * 0x0000bcddU) + ((n1 * 0x0000bcddU + n0 * 0x00004f1bU) << 16);
-#endif
}
/* Compute the sign of a permutation of a container, with and without an