Virgin import of Christos Zoulas's FILE 3.37.

1 files changed, 45 insertions, 0 deletions

diff --git a/contrib/file/aclocal.m4 b/contrib/file/aclocal.m4
index 39c1ebc..b8a4955 100644
--- a/contrib/file/aclocal.m4
+++ b/contrib/file/aclocal.m4
@@ -33,6 +33,51 @@ dnl From: eggert@twinsun.com (Paul Eggert)
 dnl Subject: autoconf 2.13 AC_CHECK_TYPE doesn't allow shell vars
 dnl Newsgroups: gnu.utils.bug
 
+dnl from autoconf 2.13 acspecific.m4, with changes to check for daylight
+
+AC_DEFUN(AC_STRUCT_TIMEZONE_DAYLIGHT,
+[AC_REQUIRE([AC_STRUCT_TM])dnl
+AC_CACHE_CHECK([for tm_zone in struct tm], ac_cv_struct_tm_zone,
+[AC_TRY_COMPILE([#include <sys/types.h>
+#include <$ac_cv_struct_tm>], [struct tm tm; tm.tm_zone;],
+  ac_cv_struct_tm_zone=yes, ac_cv_struct_tm_zone=no)])
+if test "$ac_cv_struct_tm_zone" = yes; then
+  AC_DEFINE(HAVE_TM_ZONE)
+fi
+AC_CACHE_CHECK(for tzname, ac_cv_var_tzname,
+[AC_TRY_LINK(
+changequote(<<, >>)dnl
+<<#include <time.h>
+#ifndef tzname /* For SGI.  */
+extern char *tzname[]; /* RS6000 and others reject char **tzname.  */
+#endif>>,
+changequote([, ])dnl
+[atoi(*tzname);], ac_cv_var_tzname=yes, ac_cv_var_tzname=no)])
+  if test $ac_cv_var_tzname = yes; then
+    AC_DEFINE(HAVE_TZNAME)
+  fi
+
+AC_CACHE_CHECK([for tm_isdst in struct tm], ac_cv_struct_tm_isdst,
+[AC_TRY_COMPILE([#include <sys/types.h>
+#include <$ac_cv_struct_tm>], [struct tm tm; tm.tm_isdst;],
+  ac_cv_struct_tm_isdst=yes, ac_cv_struct_tm_isdst=no)])
+if test "$ac_cv_struct_tm_isdst" = yes; then
+  AC_DEFINE(HAVE_TM_ISDST)
+fi
+AC_CACHE_CHECK(for daylight, ac_cv_var_daylight,
+[AC_TRY_LINK(
+changequote(<<, >>)dnl
+<<#include <time.h>
+#ifndef daylight /* In case IRIX #defines this, too  */
+extern int daylight;
+#endif>>,
+changequote([, ])dnl
+[atoi(daylight);], ac_cv_var_daylight=yes, ac_cv_var_daylight=no)])
+  if test $ac_cv_var_daylight = yes; then
+    AC_DEFINE(HAVE_DAYLIGHT)
+  fi
+])
+
 dnl AC_CHECK_TYPE2(TYPE, DEFAULT)
 AC_DEFUN(AC_CHECK_TYPE2,
 [AC_REQUIRE([AC_HEADER_STDC])dnl