[Bug ada/83027] Hang when attaching a SIGINT handler

[tero.koskinen at iki dot fi]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83027

--- Comment #14 from Tero Koskinen <tero.koskinen at iki dot fi> ---
Created attachment 42640
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42640&action=edit
ahven sources + modified simple_test

I added a way to reproduce the problem.

Extract all files, check Makefile, run "make all && make run".

Expected results:
"make run" (simple_test) finishes successfully.

Actual results (with gcc 7.2 on Fedora 26):
"make run" (simple_test) gets stuck to infinite loop.

I simplified simple_test.adb into following:
  with Text_IO;

  procedure Simple_Test is
  begin
     null;
  end Simple_Test;

Note that if you remove "for Library_Interface use .." statement from
ahven_simple_lib.gpr, the problem does not appear.

Also, if you use static library, the problem does not appear.

It is required that you use shared library and specify the library interface
files.