Re: Problems with C floats

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  • Posted by jimcbrown (admin) Jan 30, 2010
  • 2494 views

Yep, I can reproduce the bug.

Looking at line 182 of be_callc.c it is not obvious to me what the cause of the bug is. The casting code looks correct...

I think printf() is a bad example however. See http://www.eskimo.com/scs/cclass/int/sx11c.html and http://en.wikipedia.org/wiki/Stdarg.h#Type_safety

"A float will automatically be promoted to a double."

So when dealing with vararg functions in C, one must always use C_DOUBLE and never C_FLOAT, or things break... likewise, never use C_CHAR or C_SHORT for varargs functions.

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