[Bug 215985] Cannot build world of 11.0.1 on 10.1-RELEASE

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215985

Warner Losh <imp at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |imp at FreeBSD.org

--- Comment #1 from Warner Losh <imp at FreeBSD.org> ---
>From UPDATING:
***************************** SPECIAL WARNING: ******************************

        Due to a bug in some versions of clang that's very hard to workaround
in
        the upgrade process, to upgrade to -current you must first upgrade
        either stable/9 after r286035 or stable/10 after r286033 (including
        10.3-RELEASE) or current after r286007 (including stable/11 and
        11.0-RELEASE). These revisions post-date the 10.2 and 9.3 releases, so
        you'll need to take the unusual step of upgrading to the tip of the
        stable branch before moving to 11 or -current via a source upgrade.
        stable/11 and 11.0-RELEASE have working newer compiler. This differs
        from the historical situation where one could upgrade from anywhere on
        the last couple of stable branches, so be careful.

        If you're running a hybrid system on 9.x or 10.x with an updated clang
        compiler or are using an supported external toolchain, the build system
        will allow the upgrade. Otherwise it will print a reminder.

It was too late to include this in 11.0 when it was discovered.

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