patch 8.2.3510: changes are only detected with one second accuracyv8.2.3510

Problem:    Changes are only detected with one second accuracy.
Solution:   Use the nanosecond time if possible.  (Leah Neukirchen,
            closes #8873, closes #8875)

1 files changed, 46 insertions, 0 deletions

diff --git a/src/auto/configure b/src/auto/configure
index cab7bc9fca..cd5e59366e 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -13149,6 +13149,52 @@ if test "x$vim_cv_stat_ignores_slash" = "xyes" ; then
 
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for nanoseconds field of struct stat" >&5
+$as_echo_n "checking for nanoseconds field of struct stat... " >&6; }
+if ${ac_cv_struct_st_mtim_nsec+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_save_CPPFLAGS="$CPPFLAGS"
+   ac_cv_struct_st_mtim_nsec=no
+   # st_mtim.tv_nsec -- the usual case
+   # st_mtim._tv_nsec -- Solaris 2.6, if
+   #	(defined _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED == 1
+   #	 && !defined __EXTENSIONS__)
+   # st_mtim.st__tim.tv_nsec -- UnixWare 2.1.2
+   # st_mtime_n -- AIX 5.2 and above
+   # st_mtimespec.tv_nsec -- Darwin (Mac OSX)
+   for ac_val in st_mtim.tv_nsec st_mtim._tv_nsec st_mtim.st__tim.tv_nsec st_mtime_n st_mtimespec.tv_nsec; do
+     CPPFLAGS="$ac_save_CPPFLAGS -DST_MTIM_NSEC=$ac_val"
+     cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <sys/types.h>
+#include <sys/stat.h>
+int
+main ()
+{
+struct stat s; s.ST_MTIM_NSEC;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_struct_st_mtim_nsec=$ac_val; break
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+   done
+   CPPFLAGS="$ac_save_CPPFLAGS"
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_struct_st_mtim_nsec" >&5
+$as_echo "$ac_cv_struct_st_mtim_nsec" >&6; }
+if test $ac_cv_struct_st_mtim_nsec != no; then
+
+cat >>confdefs.h <<_ACEOF
+#define ST_MTIM_NSEC $ac_cv_struct_st_mtim_nsec
+_ACEOF
+
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for iconv_open()" >&5
 $as_echo_n "checking for iconv_open()... " >&6; }
 save_LIBS="$LIBS"