... so I might investigate that path instead.
Why? From what I see, the smoker is working as intended. The functions are not available on that platform and trying to use them ends in failure.

Standard C gives the specification for many functions; this allows the compiler to make optimizations. Such as replacing a memcpy() with immediate moves. Or replacing a printf() by puts(), etc. Or eliminating a function call that has no effect...

What you need to test is the presence of a function *in the system library*. Thus, for the purpose of said test, you can (a) make a sufficiently complicated test, avoiding constants; (b) disable the compilers awareness of those functions by disabling c99 mode, or by using -fno-builtin.

Gcc defines its internal builtins with the expectation that fallback is available. But if the libm is deficient... Using gnu tools on a non-gnu platform, you may run into problems like that.

In reply to Re^5: [C Question] Determine if gcc provides erfl() function by Anonymous Monk
in thread [C Question] Determine if gcc provides erfl() function by syphilis

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