Edit: printf-posix.m4
# printf-posix.m4 serial 6 (gettext-0.18.2) dnl Copyright (C) 2003, 2007, 2009-2016 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl From Bruno Haible. dnl Test whether the printf() function supports POSIX/XSI format strings with dnl positions. 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_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <stdio.h> #include <string.h> /* 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], [ #if defined __NetBSD__ || defined __BEOS__ || defined _MSC_VER || defined __MINGW32__ || defined __CYGWIN__ notposix #endif ], [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 ])
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