Dogcows Code - chaz/tar/blob - m4/xstrtoumax.m4

   1 #serial 3
   2
   3 # autoconf tests required for use of xstrtoumax.c
   4
   5 AC_DEFUN(jm_AC_PREREQ_XSTRTOUMAX,
   6 [
   7   AC_REQUIRE([jm_AC_TYPE_UINTMAX_T])
   8   AC_REQUIRE([jm_AC_HEADER_INTTYPES_H])
   9   AC_REQUIRE([jm_AC_TYPE_UNSIGNED_LONG_LONG])
  10   AC_CHECK_DECLS([strtoul, strtoull])
  11   AC_CHECK_HEADERS(limits.h stdlib.h)
  12
  13   AC_CACHE_CHECK([whether <inttypes.h> defines strtoumax as a macro],
  14     jm_cv_func_strtoumax_macro,
  15     AC_EGREP_CPP([inttypes_h_defines_strtoumax], [#include <inttypes.h>
  16 #ifdef strtoumax
  17  inttypes_h_defines_strtoumax
  18 #endif],
  19       jm_cv_func_strtoumax_macro=yes,
  20       jm_cv_func_strtoumax_macro=no))
  21
  22   if test "$jm_cv_func_strtoumax_macro" != yes; then
  23     AC_REPLACE_FUNCS(strtoumax)
  24   fi
  25
  26   dnl We don't need (and can't compile) the replacement strtoull
  27   dnl unless the type `unsigned long long' exists.
  28   dnl Also, only the replacement strtoumax invokes strtoull,
  29   dnl so we need the replacement strtoull only if strtoumax does not exist.
  30   case "$ac_cv_type_unsigned_long_long,$jm_cv_func_strtoumax_macro,$ac_cv_func_strtoumax" in
  31     yes,no,no)
  32       AC_REPLACE_FUNCS(strtoull strtol)
  33       ;;
  34   esac
  35
  36   case "$jm_cv_func_strtoumax_macro,$ac_cv_func_strtoumax" in
  37     no,no)
  38       AC_REPLACE_FUNCS(strtoul strtol)
  39       ;;
  40   esac
  41
  42 ])