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

[porton at narod dot ru]

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

            Bug ID: 83027
           Summary: Hang when attaching a SIGINT handler
           Product: gcc
           Version: 7.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
          Assignee: unassigned at gcc dot gnu.org
          Reporter: porton at narod dot ru
  Target Milestone: ---

Created attachment 42630
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42630&action=edit
The source reprising the bug

Extract attached bug.zip into an empty directory.

Run

make compile
./obj/simple_test

The command simple_test hangs.

The most wonderful thing is that if I do not compile it (as "make compile" 
does) as an .a library imported when linking simple_test, but put all source 
into a single directory and run "gnatmake simple_test", then the error does 
not happen (but Program_Error is raised as it should be accordingly the docs,
because pragma Unreserve_All_Interrupts is not in effect in this example code).

Another weird thing that it happens with SIGINT but not with SIGTERM nor with
SIGCHLD.

The bug also does not happen if I remove "with Ada.Text_IO;".

GCC 7.2.0.