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Dodge a name-conflict with the math.h logarithm function. D'oh.
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Currently we have to log by writing something like:
static log_var_t log_a_b_c = LOG_VAR_INIT("a.b.c");
log (log_a_b_c, "msg");
This is sort of annoying. Let's just write:
log("a.b.c", "msg");
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Currently, the log macro requires at least one argument after the format string,
because of the way the preprocessor handles varargs macros. We can hide some of
that irritation by pushing the extra arguments into a varargs function.
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This sets up a hierarchical logging facility, so that we can add logging
statements liberally, and turn them on in a fine-grained manner.
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