[Ada] Provide dummy body for big integers library used in reduced runtimes
Commit Message
The version of Ada.Numerics.Big_Numbers.Big_Integers used in the light
and embedded runtimes is only meant for proof, not execution. As a
result, all subprograms were previously marked as imported, but this
leads to a spurious compilation error in GNAT. Work around that bug for
now by providing a dummy body for the generics inside that unit.
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* libgnat/a-nbnbin__ghost.adb (Signed_Conversions,
Unsigned_Conversions): Mark subprograms as not imported.
* libgnat/a-nbnbin__ghost.ads: Provide a dummy body.
new file mode 100644
@@ -0,0 +1,76 @@
+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- ADA.NUMERICS.BIG_NUMBERS.BIG_INTEGERS --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2021, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This body is provided as a work-around for a GNAT compiler bug, as GNAT
+-- currently does not compile instantiations of the spec with imported ghost
+-- generics for packages Signed_Conversions and Unsigned_Conversions.
+
+package body Ada.Numerics.Big_Numbers.Big_Integers with
+ SPARK_Mode => Off
+is
+
+ package body Signed_Conversions with
+ SPARK_Mode => Off
+ is
+
+ function To_Big_Integer (Arg : Int) return Valid_Big_Integer is
+ begin
+ raise Program_Error;
+ return (null record);
+ end To_Big_Integer;
+
+ function From_Big_Integer (Arg : Valid_Big_Integer) return Int is
+ begin
+ raise Program_Error;
+ return 0;
+ end From_Big_Integer;
+
+ end Signed_Conversions;
+
+ package body Unsigned_Conversions with
+ SPARK_Mode => Off
+ is
+
+ function To_Big_Integer (Arg : Int) return Valid_Big_Integer is
+ begin
+ raise Program_Error;
+ return (null record);
+ end To_Big_Integer;
+
+ function From_Big_Integer (Arg : Valid_Big_Integer) return Int is
+ begin
+ raise Program_Error;
+ return 0;
+ end From_Big_Integer;
+
+ end Unsigned_Conversions;
+
+end Ada.Numerics.Big_Numbers.Big_Integers;
@@ -89,12 +89,10 @@ is
function To_Big_Integer (Arg : Int) return Valid_Big_Integer
with
- Import,
Global => null;
function From_Big_Integer (Arg : Valid_Big_Integer) return Int
with
- Import,
Pre => In_Range (Arg,
Low => To_Big_Integer (Int'First),
High => To_Big_Integer (Int'Last))
@@ -108,12 +106,10 @@ is
function To_Big_Integer (Arg : Int) return Valid_Big_Integer
with
- Import,
Global => null;
function From_Big_Integer (Arg : Valid_Big_Integer) return Int
with
- Import,
Pre => In_Range (Arg,
Low => To_Big_Integer (Int'First),
High => To_Big_Integer (Int'Last))