During closer investigation I found that it alos changes data width and similar. probably something which should be checked during configure.
I attached some code as example:
from configure:
AC_ARG_ENABLE(64,
AS_HELP_STRING([--enable-64], [64 bit pointers]))
if test "${enable_64}" = "yes" ; then
AC_MSG_CHECKING(for 64bit compilation support)
dnl Test for Linux 64 bit
if test "`uname`" = "Linux"; then
CPPFLAGS="-DAJ_Linux64 $CPPFLAGS"
fi
exmaple header:
dnl Test for FreeBSD 64 bit
#if !defined(AJ_LinuxLF) && !defined(AJ_SolarisLF) &&
!defined(AJ_IRIXLF) && !defined(AJ_AIXLF) && !defined(AJ_HPUXLF) &&
!defined(AJ_MACOSXLF) && !defined(AJ_FreeBSDLF) && !defined(WIN32)
typedef int ajint;
typedef long ajlong;
typedef unsigned int ajuint;
typedef short ajshort;
typedef unsigned short ajushort;
typedef unsigned long ajulong;
#endif
#ifdef AJ_LinuxLF
#define HAVE64
typedef int ajint;
typedef long long ajlong;
typedef unsigned int ajuint;
typedef short ajshort;
typedef unsigned short ajushort;
typedef unsigned long long ajulong;
#define ftell(a) ftello(a)
#define fseek(a,b,c) fseeko(a,b,c)
#endif
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