Get rid of obsolescent AC_HEADER_TIME. Cleanup about sys/time.h usage.

The AC_HEADER_TIME macro is obsolescent in autoconf 2.69 (2012),
and autoconf 2.71 (2021) outputs a warning, which makes autogen.sh
fail due to "--warnings=all,error", so let's avoid the warnings.
This macro defines TIME_WITH_SYS_TIME, used only in tests/tests.c
(but actually not needed). We actually have two cases:
  1. HAVE_GETTIMEOFDAY is defined: we use gettimeofday(), which
     needs <sys/time.h>.
  2. Otherwise: we use time(), which needs <time.h>.

Based on that, we can simplify the condition in tests/tests.c for
the inclusion of time-related headers, and we no longer need to
check the <sys/time.h> availability. If gettimeofday() is defined
but <sys/time.h> is not available (which shouldn't occur), then
the current gettimeofday() usage may be incorrect anyway.

Changes:
  * acinclude.m4:
      - no longer use AC_HEADER_TIME;
      - no longer check the sys/time.h header.
  * tests/tests.c: simplify the inclusion of time-related headers.

(merged changeset r14479 from the trunk)

git-svn-id: https://scm.gforge.inria.fr/anonscm/svn/mpfr/branches/4.1@14571 280ebfd0-de03-0410-8827-d642c229c3f4

2 files changed, 4 insertions, 8 deletions

diff --git a/acinclude.m4 b/acinclude.m4
index b8462ea59..32f235214 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -40,7 +40,6 @@ AC_DEFUN([MPFR_CONFIGS],
 AC_REQUIRE([AC_OBJEXT])
 AC_REQUIRE([MPFR_CHECK_LIBM])
 AC_REQUIRE([MPFR_CHECK_LIBQUADMATH])
-AC_REQUIRE([AC_HEADER_TIME])
 AC_REQUIRE([AC_CANONICAL_HOST])
 
 dnl Features for the MPFR shared cache. This needs to be done
@@ -119,7 +118,7 @@ AC_CHECK_HEADER([stdarg.h],[AC_DEFINE([HAVE_STDARG],1,[Define if stdarg])],
     AC_MSG_ERROR([stdarg.h or varargs.h not found]))])
 
 dnl sys/fpu.h - MIPS specific
-AC_CHECK_HEADERS([sys/time.h sys/fpu.h])
+AC_CHECK_HEADERS([sys/fpu.h])
 
 dnl Android has a <locale.h>, but not the following members.
 AC_CHECK_MEMBERS([struct lconv.decimal_point, struct lconv.thousands_sep],,,
diff --git a/tests/tests.c b/tests/tests.c
index 95f58b318..87360d35a 100644
--- a/tests/tests.c
+++ b/tests/tests.c
@@ -37,13 +37,10 @@ https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
 # include <fenv.h>
 #endif
 
-#ifdef TIME_WITH_SYS_TIME
-# include <sys/time.h>  /* for struct timeval */
-# include <time.h>
-#elif defined HAVE_SYS_TIME_H
-#  include <sys/time.h>
+#ifdef HAVE_GETTIMEOFDAY
+# include <sys/time.h>
 #else
-#  include <time.h>
+# include <time.h>
 #endif
 
 /* <sys/fpu.h> is needed to have union fpc_csr defined under IRIX64