diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4f6c91979ff..e1c3ef53f6b 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2001-07-20  Bruce Korb  <bkorb@gnu.org>
+
+	* fixinc/fixincl.c(test_for_changes): force unsigned char comparisons
+	because getc() and char* may disagree on signedness.
+
 2001-07-20  Richard Henderson  <rth@redhat.com>
 
 	* doc/rtl.texi (REG_DEAD): Update for current semantics.
diff --git a/gcc/fixinc/fixincl.c b/gcc/fixinc/fixincl.c
index 08d94f7e34d..23d390024fc 100644
--- a/gcc/fixinc/fixincl.c
+++ b/gcc/fixinc/fixincl.c
@@ -1261,7 +1261,7 @@ test_for_changes (read_fd)
 {
   FILE *in_fp = fdopen (read_fd, "r");
   FILE *out_fp = (FILE *) NULL;
-  char *pz_cmp = pz_curr_data;
+  unsigned char *pz_cmp = (unsigned char*)pz_curr_data;
 
 #ifdef DO_STATS
   fixed_ct++;
@@ -1273,6 +1273,7 @@ test_for_changes (read_fd)
       ch = getc (in_fp);
       if (ch == EOF)
         break;
+      ch &= 0xFF; /* all bytes are 8 bits */
 
       /*  IF we are emitting the output
           THEN emit this character, too.