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The pseudo-random number function magic() needs to be primed via magic_init() before being invoked. The standard (but klunky) way of handling this is with a static bool inside the function which indicates whether initialization has happened, and if not, handles initialization and then sets the flag. Sometimes it's more desireable to have initialization happen in a known order before program execution starts (this helps with reproducibility). We can do this by indicating to the compiler/ linker that particular functions need to be executed after __start() but before main().
This was referenced Dec 5, 2016
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Isolate all platform dependencies into
magic.c.Use constructor notation to cause magic to be self-initializing.
Remove dependency on pthreads.
This PR should go in before PR #72 or PR #78.