result of fabs or fma when <math.h> is not included?

[Vincent Lefevre]

On 2017-05-15 15:25:01 +0200, Mason wrote:
> Isn't it UB to (re)define standard functions?

Hmm... Actually yes, if there is an external linkage (7.1.3). So,
I would expect a warning by the compiler, as this should be easily
detectable. For fma(), this is also an incompatibility introduced
by C99 (AFAIK, fma wasn't reserved in C89).

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