m4/off_t-format.m4

   1 #serial 1                                                     -*- autoconf -*-
   2
   3 dnl FIXME
   4 AC_DEFUN(jm_SYS_OFF_T_PRINTF_FORMAT,
   5 [dnl
   6     AC_CHECK_HEADERS(string.h stdlinb.h)
   7     AC_CACHE_CHECK([for printf format that works with type off_t],
   8                    jm_cv_sys_off_t_printf_format,
   9     [
  10      for jm_fmt in '' L ll q; do
  11        jm_OFF_T_FORMAT="$jm_fmt"
  12        export jm_OFF_T_FORMAT
  13        AC_TRY_RUN([
  14 #        include <sys/types.h>
  15 #        include <stdio.h>
  16 #        if HAVE_STDLIB_H
  17 #         include <stdlib.h>
  18 #        endif
  19 #        if HAVE_STRING_H
  20 #         include <string.h>
  21 #        endif
  22          int
  23          main()
  24          {
  25            static off_t x[] = {1, 255, 65535, 99999999};
  26            char buf[50], fmt[50];
  27
  28            /* this should be one of these values: "", "L", "ll", "q"  */
  29            char *f = getenv ("jm_OFF_T_FORMAT");
  30
  31            sprintf (fmt, "%%%sd %%%sx %%%sx %%%sd", f, f, f, f);
  32            sprintf (buf, fmt, x[0], x[1], x[2], x[3]);
  33            exit (strcmp (buf, "1 ff ffff 99999999"));
  34          }
  35          ], jm_cv_sys_off_t_printf_format=$jm_fmt; break
  36          , jm_cv_sys_off_t_printf_format=no dnl The library version does NOT work.
  37          , jm_cv_sys_off_t_printf_format=no dnl We're cross compiling.
  38        )
  39      done
  40     ])
  41   fi
  42
  43   if test $am_cv_func_working_getline = no; then
  44     AC_LIBOBJ(getline)
  45   fi
  46 ])