[gcc r15-11400] testsuite: cast argument to char* in can_deref_null [PR126261]

https://gcc.gnu.org/g:223e11e08039a864ffc7fa4ae6d03de8c3e5f69e

commit r15-11400-g223e11e08039a864ffc7fa4ae6d03de8c3e5f69e
Author: Torbjörn SVENSSON <[email protected]>
Date:   Mon Jul 20 17:07:07 2026 +0200

    testsuite: cast argument to char* in can_deref_null [PR126261]
    
    gcc/testsuite/ChangeLog:
    
            PR testsuite/126261
            * lib/target-supports.exp (check_effective_target_can_deref_null):
            Cast argument to char*.
    
    Signed-off-by: Torbjörn SVENSSON <[email protected]>
    (cherry picked from commit d97947a3067c13dcd33eb1ef7aef14ca279316cf)

Diff:
---
 gcc/testsuite/lib/target-supports.exp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index d91c8378d01e..bbc56f8d529c 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -14562,7 +14562,7 @@ proc check_effective_target_can_deref_null { } {
 	int
 	main ()
 	{
-	  read_mem (0);
+	  read_mem ((char *)0);
 	  return 0;
 	}
       } "-O0 -fno-delete-null-pointer-checks -Wno-null-dereference"]