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

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