[Bug web/82686] Debian sid powerpc64-unknown-linux-gnu 4.13.0-1-powerpc64 bootstrap breaks in stage3 with unexpected requirement for bdw-gc

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82686

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |documentation
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-10-24
                 CC|                            |doko at gcc dot gnu.org
          Component|bootstrap                   |web
     Ever confirmed|0                           |1

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
--enable-objc-gc requires you to provide boehm-gc yourself now.  Quoting the
installation instructions:

@item --enable-objc-gc
Specify that an additional variant of the GNU Objective-C runtime library
is built, using an external build of the Boehm-Demers-Weiser garbage
collector (@uref{http://www.hboehm.info/gc/}).  This library needs to be
available for each multilib variant, unless configured with
@option{--enable-objc-gc=@samp{auto}} in which case the build of the
additional runtime library is skipped when not available and the build
continues.

This change should have been mentioned in gcc-7/changes.html but it doesn't
seem to be.

Otherwise it's behaving as expected (thus not a bug).

Matthias, can you amend changes.html?