can't link against math.h

[Christopher Hall]

Hello blubee,

On Thu, 26 Oct 2017 10:05:00 +0800, blubee blubeeme
<gurenchan at gmail.com> wrote:

> I wrote a simple test program to test and see if math.h has the
> function: exp10f

grep -r exp10f /usr/include
shows that is does not.  I could not find this function in man pages
either and also http://en.cppreference.com/w/c/numeric/math/exp does
not list it.  log10 exists but did not see and kind of exp10.
Could you have been thin of a macro you saw in an app?

the only ref I found from searching ports/math was:
 /usr/ports/math/ldouble/files/i386-makefile-patch: exp10l.o
exp2l.o expl.o expx2l.o fdtrl.o gammal.o gdtrl.o igamil.o igaml.o \

> 
> #include <math.h>
> 
> int main(int argc, char** argv)
> {
> (void)argv;
> return ((int*)(&exp10))[argc];
> }
> 
> tried compiling it with clang:
> clang++ test.cpp -o test -lm
> test.cpp:7:17: error: use of undeclared identifier 'expf10'
> return ((int*)(&expf10))[argc];
>                 ^
> 1 error generated.
> 
> tried with gcc:
> gcc test.cpp -o test -lm
> test.cpp: In function 'int main(int, char**)':
> test.cpp:7:17: error: 'expf10' was not declared in this scope
>  return ((int*)(&expf10))[argc];
> 
> Does FreeBSD math.h have expf10 and if so, how do I link against it?
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-- 
Best Regards.
Christopher Hall.