Bug report. Clang sqrtl(-1) causes access violation

[Agner Fog]

On 10/05/2019 15.50, Jose Isaias Cabrera wrote:

> It works for me.

Now it turns out that all the long double math functions cause access 
violations.

If you can't reproduce the error, what can I do to trace it?


Exception: STATUS_ACCESS_VIOLATION at rip=00180173164



Sam Habiel wrote:

> Wow I can't believe that The Agner Fog posted on the Cygwin mailing list!

This is the place to post bug reports, right?



On 10/05/2019 15.50, Jose Isaias Cabrera wrote:
> Agner Fog, on Friday, May 10, 2019 08:57 AM, wrote...
> >
> >Bug description:
> >
> >The sqrtl function under Clang causes an access violation when the
> >argument is negative.
> >
> >This error occurs only under Cygwin.
> >
> >This error occurs only with the sqrtl function, not with sqrt or sqrtf
> >
> It works for me.
>
> e608313@HOR711318E /cygdrive/c/source/c++/cygwin
> $ clang sqrt.cpp
>
> e608313@HOR711318E /cygdrive/c/source/c++/cygwin
> $ ls
> a.exe  a.exe.stackdump  ATT00001.txt  cygcheck.out  sqrt.cpp
>
> e608313@HOR711318E /cygdrive/c/source/c++/cygwin
> $ ./a.exe
> -1.000000
>
> e608313@HOR711318E /cygdrive/c/source/c++/cygwin
> $ uname -a
> CYGWIN_NT-6.1 HOR711318E 3.0.7(0.338/5/3) 2019-04-30 18:04 i686 Cygwin
>
> e608313@HOR711318E /cygdrive/c/source/c++/cygwin
> $ clang --version
> clang version 5.0.1 (tags/RELEASE_501/final)
> Target: i686-pc-windows-cygnus
> Thread model: posix
> InstalledDir: /usr/bin
>
> e608313@HOR711318E /cygdrive/c/source/c++/cygwin
> $ cat sqrt.cpp
>
>
> #include <stdio.h>
> #include <math.h>
> float a = -1.f;
>
> int main() {
> Â  Â  float b = sqrtl(a);
> Â  Â  printf("%f\n", b);
> Â  Â  return 0;
> }
>
>
>
>

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