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.

git-svn-id: https://scm.gforge.inria.fr/anonscm/svn/mpfr/trunk@14479 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 3 insertions, 6 deletions

diff --git a/tests/tests.c b/tests/tests.c
index 49953aba4..45d34568b 100644
--- a/tests/tests.c
+++ b/tests/tests.c
@@ -44,13 +44,10 @@ 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