[perl #40010] [TODO] Add a mutex to eval_nr in compilers/imcc/parser_util.c

[Matt Diephouse]

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As of r13628, compilers/imcc/parser_util.c has a static global
eval_nr that keeps track of the number of EVAL_n files that have been
opened for -D20.

This variable *must* be a global to prevent IMCC from overwriting
files that have already been written to disk (a problem that was
making -D20 useless in some cases).

This does not effect reentrancy because it has no effect on parsing.

However, it is not thread safe as is. A mutex needs to be added.
Hence the todo.

--
Matt Diephouse