gnu/dist/diffutils/m4/check-decl.m4

   1 #serial 18
   2
   3 dnl This is just a wrapper function to encapsulate this kludge.
   4 dnl Putting it in a separate file like this helps share it between
   5 dnl different packages.
   6 AC_DEFUN([jm_CHECK_DECLS],
   7 [
   8   AC_REQUIRE([_jm_DECL_HEADERS])
   9   AC_REQUIRE([AC_HEADER_TIME])
  10   headers='
  11 #include <stdio.h>
  12 #if HAVE_STRING_H
  13 # if !STDC_HEADERS && HAVE_MEMORY_H
  14 #  include <memory.h>
  15 # endif
  16 # include <string.h>
  17 #else
  18 # if HAVE_STRINGS_H
  19 #  include <strings.h>
  20 # endif
  21 #endif
  22 #if HAVE_STDLIB_H
  23 # include <stdlib.h>
  24 #endif
  25 #if HAVE_UNISTD_H
  26 # include <unistd.h>
  27 #endif
  28
  29 #include <sys/types.h>
  30 #if TIME_WITH_SYS_TIME
  31 # include <sys/time.h>
  32 # include <time.h>
  33 #else
  34 # if HAVE_SYS_TIME_H
  35 #  include <sys/time.h>
  36 # else
  37 #  include <time.h>
  38 # endif
  39 #endif
  40
  41 #if HAVE_UTMP_H
  42 # include <utmp.h>
  43 #endif
  44
  45 #if HAVE_GRP_H
  46 # include <grp.h>
  47 #endif
  48
  49 #if HAVE_PWD_H
  50 # include <pwd.h>
  51 #endif
  52 '
  53
  54   AC_CHECK_DECLS([
  55     free,
  56     getenv,
  57     geteuid,
  58     getgrgid,
  59     getlogin,
  60     getpwuid,
  61     getuid,
  62     getutent,
  63     lseek,
  64     malloc,
  65     memchr,
  66     memrchr,
  67     nanosleep,
  68     realloc,
  69     stpcpy,
  70     strndup,
  71     strnlen,
  72     strstr,
  73     strtoul,
  74     strtoull,
  75     ttyname], , , $headers)
  76 ])
  77
  78 dnl FIXME: when autoconf has support for it.
  79 dnl This is a little helper so we can require these header checks.
  80 AC_DEFUN([_jm_DECL_HEADERS],
  81 [
  82   AC_REQUIRE([AC_HEADER_STDC])
  83   AC_CHECK_HEADERS(grp.h memory.h pwd.h string.h strings.h stdlib.h \
  84                    unistd.h sys/time.h utmp.h utmpx.h)
  85 ])