Import of a GCC 2.96 SNAPSHOT taken from the trunk of the GCC anoncvs

server on 3-June-2000.

1 files changed, 64 insertions, 16 deletions

diff --git a/contrib/libf2c/libU77/aclocal.m4 b/contrib/libf2c/libU77/aclocal.m4
index d230dad..b9a74fd 100644
--- a/contrib/libf2c/libU77/aclocal.m4
+++ b/contrib/libf2c/libU77/aclocal.m4
@@ -1,16 +1,64 @@
-dnl See whether we have struct timezone
-dnl LIBU77_HAVE_STRUCT_TIMEZONE
-AC_DEFUN(LIBU77_HAVE_STRUCT_TIMEZONE,
-[AC_MSG_CHECKING([whether struct timezone exists])
-AC_CACHE_VAL(libu77_cv_have_struct_timezone,
-[AC_TRY_COMPILE([#include <sys/time.h>],
-[struct timezone tz;],
-libu77_ac_have_struct_timezone=yes, libu77_ac_have_struct_timezone=no)])
-if test $libu77_ac_have_struct_timezone = yes; then
-  AC_MSG_RESULT(yes)
-  AC_DEFINE_UNQUOTED(HAVE_STRUCT_TIMEZONE)
-else
-  AC_MSG_RESULT(no)
-fi
-])dnl
-
+dnl Check:
+dnl * If we have gettimeofday;
+dnl * If we have struct timezone for use in calling it;
+dnl * If calling it with a timezone pointer actually works -- this is deemed
+dnl   obsolete or undefined on some systems which say you should use a null
+dnl   pointer -- and undefine HAVE_TIMEZONE if so;
+dnl * Whether it only takes one arg.
+AC_DEFUN(LIBU77_GETTIMEOFDAY, [
+  AC_CHECK_FUNCS(gettimeofday)
+  if test "$ac_cv_func_gettimeofday" = yes; then
+    AC_CACHE_CHECK([for struct timezone], g77_cv_struct_timezone,
+      [AC_TRY_COMPILE([#include <sys/time.h>],
+      [struct timezone tz;],
+      g77_cv_struct_timezone=yes, g77_cv_struct_timezone=no)])
+    if test $g77_cv_struct_timezone = yes; then
+      dnl It may be that we can't call gettimeofday with a non-null pointer.
+      dnl In that case we'll lie about struct timezone.
+      AC_TRY_RUN([
+#ifdef TIME_WITH_SYS_TIME
+#include <sys/time.h>
+#include <time.h>
+#else
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#else
+#include <time.h>
+#endif
+#endif
+main ()
+{
+  struct timeval time;
+  struct timezone dummy;
+  if (gettimeofday (&time, &dummy))
+    exit (1);
+  else
+    exit (0);
+}],
+      [AC_DEFINE(HAVE_TIMEZONE)], ,[AC_DEFINE(HAVE_TIMEZONE)])
+    fi
+    AC_REQUIRE([AC_HEADER_TIME])
+    AC_CACHE_CHECK(whether gettimeofday can accept two arguments,
+      emacs_cv_gettimeofday_two_arguments,
+      AC_TRY_LINK([
+#ifdef TIME_WITH_SYS_TIME
+#include <sys/time.h>
+#include <time.h>
+#else
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#else
+#include <time.h>
+#endif
+#endif
+      ],
+      [
+      struct timeval time;
+      struct timezone dummy;
+      gettimeofday (&time, &dummy);],
+      emacs_cv_gettimeofday_two_arguments=yes,
+      emacs_cv_gettimeofday_two_arguments=no))
+    if test $emacs_cv_gettimeofday_two_arguments = no; then
+      AC_DEFINE(GETTIMEOFDAY_ONE_ARGUMENT)
+    fi
+  fi])