I use tcc as a part of a numerical framework on Windows.
I can confirm that:
- sinf does not work
- some math functions (not just limited to sin) do not announce as
undeclared when math.h is missing. Instead these undeclared math functions
return strange values. In my case, sin(1.0) returns 639.0 when math.h is
missing. Apart from a wrong return value, the framework malfunctions
(following function calls are unpredictable), suggesting that the memory is
messed up.
Indeed sizeof sin(1.0) is 8 when math.h is included and 4 when it is not
(which should correspond to float). My best guess is that printf tries to
display a 4 byte as an 8 byte value, hence the wrong output (and memory
mess-up). This is indeed toxic and requires a fix, and I hope a qualified
someone is able to resolve this issue.
~Mads
2014-12-24 3:08 GMT+01:00 Oleg N. Cher <al...@ukr.net>:
> Hi all,
>
> float version sinf does not work as expected:
>
> #include <stdio.h>
> #include <math.h>
>
> int main(int argc, char **argv) {
> float f = sinf(0.1);
> printf("%f", f);
> return 0;
> }
>
> >tcc testsinf.c
> tcc: error: undefined symbol 'sinf'
>
>
>
> Next question is a very evil problem, I think. if #include <Math> not
> specified, absolutely no bugs/warnings, but code works wrong:
>
>
> #include <stdio.h>
>
> int main(int argc, char **argv) {
>
> printf("\n%f", sin(-3.0));
> printf("\n%f", sin(-2.0));
> printf("\n%f", sin(-1.0));
> printf("\n%f", sin(0.0));
> printf("\n%f", sin(1.0));
> printf("\n%f", sin(2.0));
> printf("\n%f", sin(3.0));
> printf("\n%f", sin(3.1415926));
>
> return 0;
> }
>
> >tcc testsinf.c
> >testsinf.exe
>
> 0.000000
> 0.000000
> 0.000000
> 0.000000
> 0.000000
> 0.000000
> 0.000000
> 0.000000
>
> Please agree with me that this must be fixed.
>
> Thank you.
>
>
> --
> Oleg
>
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