[Bug 232930] biology/canu fails to build with GCC 8

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232930

            Bug ID: 232930
           Summary: biology/canu fails to build with GCC 8
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: jwb at freebsd.org
          Reporter: gerald at FreeBSD.org
            Blocks: 231590
             Flags: maintainer-feedback?(jwb at freebsd.org)
          Assignee: jwb at freebsd.org

This port fails to build with GCC 8, blocking the update of the default
version of GCC to that version.

http://package22.nyi.freebsd.org/data/112amd64-default-PR231590/2018-10-29_06h48m05s/logs/errors/canu-1.7_2.log

AS_UTL/stddev.H: In member function 'std::vector<long unsigned int>&
genericStatistics<TT>::Nstatistics()':
AS_UTL/stddev.H:346:12: error: invalid initialization of non-const reference of
type 'std::vector<long unsigned int>&' from an rvalue of type 'std::vector<long
unsigned int>*'
     return(&_Nstatistics);
           ~^~~~~~~~~~~~~~
gmake[1]: *** [Makefile:659:
/wrkdirs/usr/ports/biology/canu/work/canu-1.7/src/usr/local/FreeBSD-amd64/obj/lib/libcanu.a/utgcns/libNDalign/NDalign.o]
Error 1
gmake[1]: Leaving directory '/wrkdirs/usr/ports/biology/canu/work/canu-1.7/src'
*** Error code 1


Note: upstream released Canu v1.8 two weeks ago, which may address this
bug?


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231590
[Bug 231590] [exp-run] Update GCC_DEFAULT from 7 to 8
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