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From: Jose Isaias Cabrera <jicman AT outlook DOT com>
To: Agner Fog <agner AT agner DOT org>, "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: Bug report. Clang sqrtl(-1) causes access violation
Date: Fri, 10 May 2019 13:50:16 +0000
Message-ID: <DB7PR01MB53860FB36CC45154C5862E99DE0C0@DB7PR01MB5386.eurprd01.prod.exchangelabs.com>
References: <c80240c2-a30e-41b5-7635-cf31f54741d1 AT agner DOT org>
In-Reply-To: <c80240c2-a30e-41b5-7635-cf31f54741d1@agner.org>
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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 AT HOR711318E /cygdrive/c/source/c++/cygwin
$ clang sqrt.cpp

e608313 AT HOR711318E /cygdrive/c/source/c++/cygwin
$ ls
a.exe  a.exe.stackdump  ATT00001.txt  cygcheck.out  sqrt.cpp

e608313 AT HOR711318E /cygdrive/c/source/c++/cygwin
$ ./a.exe
-1.000000

e608313 AT 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 AT 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 AT HOR711318E /cygdrive/c/source/c++/cygwin
$ cat sqrt.cpp


#include <stdio.h>
#include <math.h>
float a = -1.f;

int main() {
    float b = sqrtl(a);
    printf("%f\n", b);
    return 0;
}





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