##### http://autoconf-archive.cryp.to/ac_c_printf_thsep.html
#
# SYNOPSIS
#
#   AC_C_PRINTF_THSEP
#
# DESCRIPTION
#
#   This macro checks whether the compiler supports the ' flag in
#   printf, which causes the non-fractional digits to be separated
#   using a separator and grouping determined by the locale. If true,
#   HAVE_PRINTF_THSEP is defined in config.h
#
# LAST MODIFICATION
#
#   2006-04-26
#
# COPYLEFT
#
#   Copyright (c) 2006 Bill Poser <billposer@alum.mit.edu>
#
#   Copying and distribution of this file, with or without
#   modification, are permitted in any medium without royalty provided
#   the copyright notice and this notice are preserved.

AC_DEFUN([AC_C_PRINTF_THSEP],
[AC_TRY_COMPILE(,[printf("%'2d",101);],ac_cv_c_printf_thsep=yes,ac_cv_c_printf_thsep=no)
 if test $ac_cv_c_printf_thsep = yes; then
  AC_DEFINE(HAVE_PRINTF_THSEP, 1, [compiler understands printf flag for thousands separation in ints])
 fi
])