Hi Reid,
Thanks for taking a look at this.
Here was the full error:

llvm\tools\clang\lib\ASTMatchers\Dynamic\Registry.cpp : fatal error C1128: 
number of sections exceeded object file format limit: compile with /bigobj

That file seems to have quite a bit of macro magic going on, so I'll try to dig deeper into this when I'm back in the office tomorrow.

On 09/02/2016 17:11, Reid Kleckner wrote:
Which object file has crossed the limit? When this has happened before, this has usually highlighted over use of templates, which is worth fixing because it speeds up builds on other platforms as well. If MSVC 2015 instead just happens to generate say one extra section per function, then we should probably use bigobj.

On Tue, Feb 9, 2016 at 3:55 AM, Aidan Dodds via lldb-dev <lldb-dev@lists.llvm.org <mailto:lldb-dev@lists.llvm.org>> wrote:

    Hi all,

    I pulled in recent changes to upstream llvm, clang and lldb and it
    seems
    to have tipped my windows build over the edge, and its complaining
    that
    my object files have exceeded the section limit.
    This error is raised while building the clang libraries. Has anyone
    else seen this problem while doing an x64 build with with Visual
    Studio
    2015?

    This problem can be fixed however by specifying /bigobj as a compiler
    flag.  The problem is however that this needs to be given to clang,
    which in turn inherits most of its cmake from llvm.

    I have attached my prospective patch for this issue, but wanted to
    check
    in with the lldb folk first to see if anyone has hit this issue,
    and if
    they would have any feedback before I submit it to llvm.

    Thanks,
    Aidan

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