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Re: make check fails? (emacs-26.1 w/modules)

From: Robert Pluim
Subject: Re: make check fails? (emacs-26.1 w/modules)
Date: Wed, 12 Sep 2018 15:41:55 +0200

Greg Minshall <address@hidden> writes:

> Paul,
>> I'm afraid I can't help much more. I'd try a later GCC, or file a
>> compiler bug report if you must use that particular GCC.
> thanks for the suggestions so far (esp. V=1!).
> negative persistence being what it is, i used "lxd" magic, spun up a new
> Ubuntu 16.04 release, cloned the git repository, "git checkout
> emacs-26.1", downloaded all the prereqs, autogen.sh'd, configured :
> ./configure --with-xwidgets --with-modules --without-dbus then, "make &&
> make check"; same results.  (and, for my sanity self-appraisal, i'm glad
> for Robert Pluim's confirmation -- thanks!)
> i'll try to report it to gcc (not a community with which i have
> much other-than-user experience, so, something new).

My CPU was idle for a while, so I set it to work bisecting this. It
came up with the following gcc commit:

    commit e98da821c1ee4450bbe40a0278cd75803706aa7c (HEAD, refs/bisect/new)
    Author: hubicka <address@hidden>
    Date:   Sun Dec 20 05:50:29 2015 +0000

                PR middle-end/65337
                * tree-ssa-dce.c (bb_postorder): New static var.
                (forward_edge_to_pdom): Remove.
                (remove_dead_stmt): Instead of redirecting edges only keep an 
                on a path to nearest live BB.
                (eliminate_unnecessary_stmts): Free bb_postorder.
                * cfganal.c (dfs_find_deadend): Add START_POINTES.
                * cfganal.h (inverted_post_order_compute): Update prototype.

        git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/address@hidden 

which is three years old. I guess you could try to get it backported
to the gcc in 16.04, but it might be easier for you to just install a
later version of gcc (or upgrade to a later version of Ubuntu :-) )



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