https://bugs.llvm.org/show_bug.cgi?id=36101

            Bug ID: 36101
           Summary: LLD COFF produces bad diagnostics for undefined
                    /include symbol
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: COFF
          Assignee: unassignedb...@nondot.org
          Reporter: smee...@fb.com
                CC: compn...@compnerd.org, llvm-bugs@lists.llvm.org,
                    pe...@pcc.me.uk, r...@google.com, r...@google.com,
                    ztur...@google.com

% cat using.c
int main() { return 0; }
#pragma comment(linker, "/include:undefined")

% clang -target x86_64-windows-msvc -c using.c
$ lld-link -entry:main using.o
lld-link: error: <root>: undefined symbol: undefined

Undefined symbols from /include directives in object files are reported as
originating from the GC root, which is confusing and makes the user have to
manually hunt for the errant object file.

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