check compiler support for printf apostrophe flag

2006-04-26

Bill Poser <billposer@alum.mit.edu>

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cryp.to ac-archive's C Support (released)

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

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
])