John Hemmick 6372f515fe Allow debug prints without __VA_ARGS__ ...

__VA_ARGS__ are frustrating in C. Even for their main purpose (printf),
they fall short in that they don't have a _portable_ way to have zero
arguments after the format string in a printf call.

Even if we detect compilers and use ##__VA_ARGS__ where available, GCC
emits a warning with -pedantic that is _impossible_ to explicitly
disable.

This commit contains the best solution we can think of. A bit of
indirection that adds a hidden "%s" % "" to the end of the format
string. This solution does not work everywhere as it has a runtime
cost, but it is hopefully ok for debug statements.

2020-03-29 21:58:49 -05:00

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