From 88bc304ba815e21b09373cfec4e2f1f087482214 Mon Sep 17 00:00:00 2001
From: Carlos Santos
Date: Wed, 3 Jul 2019 13:31:34 -0300
Subject: hwclock: use CMOS clock only if available

- Add --disable-hwclock-cmos configuration argument
- Add USE_HWCLOCK_CMOS (enabled by default for i386/x86_64)
- Add define(USE_HWCLOCK_CMOS)
- Compile hwclock-cmos.c only if USE_HWCLOCK_CMOS is true
- Remove all unnecessary #ifdefs from hwclock-cmos.c
- Add #ifdef USE_HWCLOCK_CMOS around the determine_clock_access_method()
  call in hwclock.c

Signed-off-by: Carlos Santos <unixmania@gmail.com>
---
 configure.ac | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 997b6388c..8aa2fed38 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1517,6 +1517,19 @@ UL_REQUIRES_HAVE([hwclock], [io, linuxdummy], [ioperm iopl function or Linux])
 AM_CONDITIONAL([BUILD_HWCLOCK], [test "x$build_hwclock" = xyes])
 
 
+AC_ARG_ENABLE([hwclock-cmos],
+  AS_HELP_STRING([--disable-hwclock-cmos], [do not use CMOS clock]),
+  [], [use_hwclock_cmos="$build_hwclock"]
+)
+
+AS_IF([test "x$use_hwclock_cmos" = xyes], [
+  AM_CONDITIONAL([USE_HWCLOCK_CMOS], [true])
+  AC_DEFINE([USE_HWCLOCK_CMOS], [1], [Define to 1 if want to use CMOS clock.])
+],[
+  AM_CONDITIONAL([USE_HWCLOCK_CMOS], [false])
+])
+
+
 UL_BUILD_INIT([mkfs], [yes])
 AM_CONDITIONAL([BUILD_MKFS], [test "x$build_mkfs" = xyes])
 
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