Compilation issue after including the crate through an indirect dependency

[mgrojo]

Steps to reproduce:

   alr init --bin issue_1386
   cd issue_1386
   alr with ashell
   alr build

This fails with:

posix-signals.ads:39:06: warning: unnecessary with of ancestor [-gnatwr]

   compilation of posix-signals.adb failed

gprbuild: *** compilation phase failed
error: Command ["gprbuild", "-s", "-j0", "-p", "-P", "/tmp/issue_1386/issue_1386.gpr"] exited with code 4
error: Compilation failed.

The distributed version of the crate should not treat the warnings as errors, since future versions of the compiler can raise new warnings which will impede using the library. The switch should be only used by the maintainer of the library, not for users.

See alire-project/alire#1386 (comment) and following comments.

Thanks for your work.

[mgrojo]

I found out that the problem is actually on the ashell side. See charlie5/aShell#7