[gcc r13-4973] ada: Fix unescaped quotes when combining fdiagnostics-format=json and gnatdJ

[Marc Poulhi?s <dkm@gcc.gnu.org>]

https://gcc.gnu.org/g:201c21b0e847679645df1af3dd13459274f41047

commit r13-4973-g201c21b0e847679645df1af3dd13459274f41047
Author: Ghjuvan Lacambre <lacambre@adacore.com>
Date:   Mon Dec 12 14:54:47 2022 +0100

    ada: Fix unescaped quotes when combining fdiagnostics-format=json and gnatdJ
    
    This commit fixes a small bug where GNAT would emit unescaped quotes in
    its -fdiagnostics-format=json output when using -gnatdJ and emitting
    messages about operator functions (e.g. "=").
    
    gcc/ada/
    
            * errout.adb (Write_JSON_Span): Escape subprogram name.

Diff:
---
 gcc/ada/errout.adb | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gcc/ada/errout.adb b/gcc/ada/errout.adb
index b30e8b51d15..261ba2e8033 100644
--- a/gcc/ada/errout.adb
+++ b/gcc/ada/errout.adb
@@ -2193,8 +2193,9 @@ package body Errout is
          end if;
 
          if Include_Subprogram_In_Messages then
-            Write_Str
-              (",""subprogram"":""" & Subprogram_Name_Ptr (Error.Node) & """");
+            Write_Str (",""subprogram"":""");
+            Write_JSON_Escaped_String (Subprogram_Name_Ptr (Error.Node));
+            Write_Str ("""");
          end if;
 
          Write_Str ("}");