granicus.if.org Git - linux-pam/blob - m4/japhar_grep_cflags.m4

   1 dnl
   2 dnl JAPHAR_GREP_CFLAGS(flag, cmd_if_missing, cmd_if_present)
   3 dnl
   4 dnl From Japhar.  Report changes to japhar@hungry.com
   5 dnl
   6 AC_DEFUN([JAPHAR_GREP_CFLAGS],
   7 [case "$CFLAGS" in
   8 "$1" | "$1 "* | *" $1" | *" $1 "* )
   9   ifelse($#, 3, [$3], [:])
  10   ;;
  11 *)
  12   $2
  13   ;;
  14 esac
  15 ])
  16
  17 dnl
  18 dnl Test for __attribute__ ((unused))
  19 dnl Based on code from the tcpdump version 3.7.2 source.
  20 dnl
  21
  22 AC_DEFUN([AC_C___ATTRIBUTE__], [
  23 AC_MSG_CHECKING(for __attribute__)
  24 AC_CACHE_VAL(ac_cv___attribute__, [
  25 AC_TRY_COMPILE([
  26 #include <stdlib.h>
  27 static void foo (void) __attribute__ ((unused));
  28
  29 static void
  30 foo (void)
  31 {
  32   exit(1);
  33 }
  34 ],
  35 [
  36   exit (0);
  37 ],
  38 ac_cv___attribute__=yes,
  39 ac_cv___attribute__=no)])
  40 if test "$ac_cv___attribute__" = "yes"; then
  41   AC_DEFINE(UNUSED, __attribute__ ((unused)), [define if your compiler has __att
  42 ribute__ ((unused))])
  43 else
  44   AC_DEFINE(UNUSED,,)
  45 fi
  46 AC_MSG_RESULT($ac_cv___attribute__)
  47 ])