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

[Agner Fog <agner at agner dot org>]

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

Attached:

sqrt.cpp: program to reproduce the error. Compile clang sqrt.cpp and run 
./a.exe

stackdump

cygcheck.out

Attachment: a.exe.stackdump
Description: Text document

Attachment: cygcheck.out
Description: Text document

Attachment: sqrt.cpp
Description: Text document

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