Index: gcc/testsuite/gcc.dg/torture/pr35634.c
===================================================================
--- gcc/testsuite/gcc.dg/torture/pr35634.c	(revision 194077)
+++ gcc/testsuite/gcc.dg/torture/pr35634.c	(working copy)
@@ -14,6 +14,6 @@ void foo (int i)
 
 int main ()
 {
-    char c;
+    signed char c;
     for (c = 0; ; c++) foo (c);
 }
Index: gcc/testsuite/g++.dg/torture/pr35634.C
===================================================================
--- gcc/testsuite/g++.dg/torture/pr35634.C	(revision 194077)
+++ gcc/testsuite/g++.dg/torture/pr35634.C	(working copy)
@@ -14,6 +14,6 @@ void foo (int i)
 
 int main ()
 {
-    char c;
+    signed char c;
     for (c = 0; ; c++) foo (c);
 }