[gcc r12-3804] [Ada] Allow more cases of import with Relaxed_RM_Semantics

[Pierre-Marie de Rodat]

https://gcc.gnu.org/g:326b74705c26a52226bc737cc94be584dd2505e1

commit r12-3804-g326b74705c26a52226bc737cc94be584dd2505e1
Author: Arnaud Charlet <charlet@adacore.com>
Date:   Thu Jul 15 17:31:11 2021 +0000

    [Ada] Allow more cases of import with Relaxed_RM_Semantics
    
    gcc/ada/
    
            * sem_prag.adb (Process_Import_Or_Interface): Relax error when
            Relaxed_RM_Semantics.

Diff:
---
 gcc/ada/sem_prag.adb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gcc/ada/sem_prag.adb b/gcc/ada/sem_prag.adb
index 9cad55d9cc2..0228717d707 100644
--- a/gcc/ada/sem_prag.adb
+++ b/gcc/ada/sem_prag.adb
@@ -9532,7 +9532,11 @@ package body Sem_Prag is
 
             Process_Import_Predefined_Type;
 
-         else
+         --  Emit an error unless Relaxed_RM_Semantics since some legacy Ada
+         --  compilers may accept more cases, e.g. JGNAT allowed importing
+         --  a Java package.
+
+         elsif not Relaxed_RM_Semantics then
             if From_Aspect_Specification (N) then
                Error_Pragma_Arg
                   ("entity for aspect% must be object, subprogram "