[Bug 239266] lang/gcc8 fails to build with clang8: tree-vect-loop.c:4979:12: error: expected unqualified-id

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239266

            Bug ID: 239266
           Summary: lang/gcc8 fails to build with clang8:
                    tree-vect-loop.c:4979:12: error: expected
                    unqualified-id
           Product: Ports & Packages
           Version: Latest
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gerald at FreeBSD.org
          Reporter: leandro.lupori at gmail.com
                CC: powerpc at FreeBSD.org
          Assignee: gerald at FreeBSD.org
             Flags: maintainer-feedback?(gerald at FreeBSD.org)
                CC: powerpc at FreeBSD.org

With a not yet official PPC64 ELFv2 system, where clang8 is the system
compiler, lang/gcc8 fails to build with the following errors (listed only the
first 3):

/usr/ports/lang/gcc8/work/gcc-8.3.0/gcc/tree-vect-loop.c:4979:12: error:
expected unqualified-id
      tree vec_step = build_vector_from_val (cr_index_vector_type, step);
           ^
/usr/ports/lang/gcc8/work/gcc-8.3.0/gcc/tree-vect-loop.c:4985:39: error:
expected expression
      create_iv (series_vect, vec_step, NULL_TREE, loop, &incr_gsi,
                                      ^
/usr/ports/lang/gcc8/work/gcc-8.3.0/gcc/tree-vect-loop.c:7653:27: error:
expected unqualified-id
  tree new_vec, vec_init, vec_step, t;


The problem seems to be related with conflicting definitions of vec_step,
between gcc and clang.

This seems to be related with the issues reported here:
https://lists.freebsd.org/pipermail/freebsd-ports/2017-December/111461.html

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