AC_DEFUN([gt_PRINTF_POSIX],
[
AC_REQUIRE([AC_PROG_CC])
AC_CACHE_CHECK([whether printf() supports POSIX/XSI format strings],
gt_cv_func_printf_posix,
[
AC_TRY_RUN([
/* The string "%2$d %1$d", with dollar characters protected from the shell's
dollar expansion (possibly an autoconf bug). */
static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };
static char buf[100];
int main ()
{
sprintf (buf, format, 33, 55);
return (strcmp (buf, "55 33") != 0);
}], gt_cv_func_printf_posix=yes, gt_cv_func_printf_posix=no,
[
AC_EGREP_CPP(notposix, [
notposix
], gt_cv_func_printf_posix="guessing no",
gt_cv_func_printf_posix="guessing yes")
])
])
case $gt_cv_func_printf_posix in
*yes)
AC_DEFINE(HAVE_POSIX_PRINTF, 1,
[Define if your printf() function supports format strings with positions.])
;;
esac
])