aclocal.m4

   1 dnl aclocal.m4 -- custom autoconf macros for various purposes
   2 dnl Updated for Autoconf v2
   3 dnl
   4 dnl ******** save/restore stuff **********
   5 define(AC_KNFSD_SAVE,
   6   [AC_LANG_SAVE
   7    save_LDFLAGS=$LDFLAGS
   8    save_CFLAGS=$CFLAGS
   9    save_CXXFLAGS=$CXXFLAGS
  10    save_LIBS=$LIBS
  11 ])dnl
  12 define(AC_KNFSD_RESTORE,
  13   [LDFLAGS=$save_LDFLAGS
  14    CFLAGS=$save_CFLAGS
  15    CXXFLAGS=$save_CXXFLAGS
  16    LIBS=$save_LIBS
  17    AC_LANG_RESTORE
  18 ])dnl
  19 dnl *********** GNU libc 2 ***************
  20 define(AC_GNULIBC,
  21   [AC_MSG_CHECKING(for GNU libc2)
  22   AC_CACHE_VAL(knfsd_cv_glibc2,
  23   [AC_TRY_CPP([
  24       #include <features.h>
  25       #if !defined(__GLIBC__)
  26       # error Nope
  27       #endif], knfsd_cv_glibc2=yes, knfsd_cv_glibc2=no)])
  28   AC_MSG_RESULT($knfsd_cv_glibc2)
  29   if test $knfsd_cv_glibc2 = yes; then
  30     CFLAGS="$CFLAGS -D_GNU_SOURCE"
  31     CXXFLAGS="$CXXFLAGS -D_GNU_SOURCE"
  32   fi
  33 ]) dnl
  34 dnl
  35 dnl ************* egcs *******************
  36 define(AC_PROG_EGCS,
  37   [AC_MSG_CHECKING(for egcs)
  38   AC_CACHE_VAL(knfsd_cv_prog_EGCS,
  39   [case `$CC --version 2>/dev/null` in
  40    egcs*)
  41         knfsd_cv_prog_EGCS=yes;;
  42    *)
  43         knfsd_cv_prog_EGCS=no;;
  44    esac
  45   ])
  46   AC_MSG_RESULT($knfsd_cv_prog_EGCS)
  47   test $knfsd_cv_prog_EGCS = yes && AC_DEFINE(HAVE_EGCS)
  48 ]) dnl
  49 dnl *********** sizeof(dev_t) **************
  50 dnl ** We have to kludge this rather than use AC_CHECK_SIZEOF because
  51 dnl ** we have to include sys/types.h. Ugh.
  52 define(AC_DEV_T_SIZE,
  53   [AC_MSG_CHECKING(size of dev_t)
  54    AC_CACHE_VAL(ac_cv_sizeof_dev_t,
  55    [AC_TRY_RUN(
  56     [#include <stdio.h>
  57      #include <sys/types.h>
  58      main()
  59      {
  60       FILE *f=fopen("conftestval", "w");
  61       if (!f) exit(1);
  62       fprintf(f, "%d\n", sizeof(dev_t));
  63       exit(0);
  64     }], ac_cv_sizeof_dev_t=`cat conftestval`, ac_cv_sizeof_dev_t=0)])
  65     AC_MSG_RESULT($ac_cv_sizeof_dev_t)
  66     AC_DEFINE(SIZEOF_DEV_T,$ac_cv_sizeof_dev_t)
  67   ])
  68 dnl *********** sizeof(xxx_t) **************
  69 dnl ** Overwrite the AC_CHECK_SIZEOF macro as we must include sys/types.h
  70 define([AC_CHECK_SIZEOF],
  71   [changequote(<<, >>)dnl
  72    define(<<AC_TYPE_NAME>>,translit(sizeof_$1, [a-z *], [A-Z_P]))dnl
  73    define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl
  74    changequote([, ])dnl
  75    AC_MSG_CHECKING(size of $1)
  76    AC_CACHE_VAL(AC_CV_NAME,
  77    [AC_TRY_RUN(
  78     [#include <stdio.h>
  79      #include <sys/types.h>
  80      main()
  81      {
  82       FILE *f=fopen("conftestval", "w");
  83       if (!f) exit(1);
  84       fprintf(f, "%d\n", sizeof($1));
  85       exit(0);
  86     }], AC_CV_NAME=`cat conftestval`, AC_CV_NAME=0)])
  87     AC_MSG_RESULT($AC_CV_NAME)
  88     AC_DEFINE_UNQUOTED(AC_TYPE_NAME,$AC_CV_NAME)
  89     undefine([AC_TYPE_NAME])dnl
  90     undefine([AC_CV_NAME])dnl
  91   ])
  92 dnl *********** BSD vs. POSIX signal handling **************
  93 define([AC_BSD_SIGNALS],
  94   [AC_MSG_CHECKING(for BSD signal semantics)
  95   AC_CACHE_VAL(knfsd_cv_bsd_signals,
  96     [AC_TRY_RUN([
  97         #include <signal.h>
  98         #include <unistd.h>
  99         #include <sys/wait.h>
 100
 101         static int counter = 0;
 102         static RETSIGTYPE handler(int num) { counter++; }
 103
 104         int main()
 105         {
 106                 int     s;
 107                 if ((s = fork()) < 0) return 1;
 108                 if (s != 0) {
 109                         if (wait(&s) < 0) return 1;
 110                         return WIFSIGNALED(s)? 1 : 0;
 111                 }
 112
 113                 signal(SIGHUP, handler);
 114                 kill(getpid(), SIGHUP); kill(getpid(), SIGHUP);
 115                 return (counter == 2)? 0 : 1;
 116         }
 117     ], knfsd_cv_bsd_signals=yes, knfsd_cv_bsd_signals=no)]) dnl
 118     AC_MSG_RESULT($knfsd_cv_bsd_signals)
 119     test $knfsd_cv_bsd_signals = yes && AC_DEFINE(HAVE_BSD_SIGNALS)
 120 ])dnl