[m-rev.] for review: fix mantis bug 514

[Zoltan Somogyi]

The attached diff has bootchecked in a deep profiling grade both with and without
-fno-common, and I am just now testing it in other LLDS grades, but my laptop
has gcc 7.5. Does anyone have gcc 10? If so, could you please try it out,
either before or after review (by anyone) or commit?

Zoltan.
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