[Buildroot] [Bug 11641] New: linux kernel .config timestamp always out of date fixed with KCONFIG_NOSILENTUPDATE

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=11641

            Bug ID: 11641
           Summary: linux kernel .config timestamp always out of date
                    fixed with KCONFIG_NOSILENTUPDATE
           Product: buildroot
           Version: 2018.11.1
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: dcraw101 at yahoo.com
                CC: buildroot at uclibc.org
  Target Milestone: ---

Just noticed this when migrating from kernel 4.9 to 4.19.  I noticed that now
in the linux kernel build dir the .config timestamp is always later than the
.stamp_kconfig_fixup_done.  So every incremental buildroot make causes the
kernel build to always run starting at the kconfig fixup phase.

I traced the problem to somewhere in the kernel syncconfig step in the kernel
"build" phase.  I think it is related to this new kernel 4.19 commit.

16952b77d8 kconfig: make syncconfig update .config regardless of
sym_change_count

If I define KCONFIG_NOSILENTUPDATE in my environment the problem goes away and
the timestamps are correct.  Should buildroot set this env variable?  I am not
sure what the other side affects would be.

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