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Date: Fri, 13 Aug 2021 00:23:14 -0700 (PDT)
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Subject: Raising "exception" in a .gpr file
From: mockturtle <framefritti@gmail.com>
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Dear.all,
I am linting an old library of mine (suid_helper) thought to help in writin=
g setuid programs. (Basically, it drops suid privileges when program starts=
 and allows to run in privileged mode only via few selected procedures, see=
 https://gitlab.com/mockturtle/suid-helper  if you are curious).

At the moment the library works for Linux (since I use Linux) and I guess i=
t could work with most other *nixes (but setuid stuff portability is tricky=
). =20
As you can imagine, there is a part that is OS-dependent.  I isolated it in=
to a directory that is selected in the gpr files on the basis of the curren=
t OS=20

(BTW: I am using an external value for this, there is some more "standard" =
way to get the OS within the gpr file?)

For sure it does not work with Windows since that OS does not have the conc=
ept of "setuid executable" (as far as I know). =20
It would be nice to be able to "raise an exception" when the OS is Windows,=
 in the sense that the user that tries to compile (by mistake) the library =
under Windows  gets a message like=20

"You cannot compile this in Windows since Windows has no setuid concept"

rather than getting some mysterious compile error later.

Just to be clear, I am thinking to something like


  case OS is
  ...when "linux" =3D>
   ......Arch_Sources :=3D "src/Linux";

  ...when "macos" =3D>
   ......Arch_Sources :=3D "src/Mac";

  ...when "windows" =3D>
   ......raise "This library makes no sense with this OS";
    end case;

I tried to look in the manual, this newsgroup and googled a bit, but I did =
not find anything.  I am afraid that this is not possible (although I think=
 it could be a nice addition).

Do you know if this is possible and how?

Thank you in advance

Riccardo