PR27722, error: array subscript has type char

PR 27722
	* libdep_plugin.c (str2vec): Don't pass a potentially signed char
	to isspace.

ld/ChangeLog

@@ -1,3 +1,9 @@
+2021-04-13  Alan Modra  <amodra@gmail.com>
+
+	PR 27722
+	* libdep_plugin.c (str2vec): Don't pass a potentially signed char
+	to isspace.
+
 2021-04-12  Alan Modra  <amodra@gmail.com>
 
 	* configure.ac (--enable-checking): Add support.

ld/libdep_plugin.c

@@ -139,7 +139,7 @@ str2vec (char *in)
 
   end = in + strlen (in);
   s = in;
-  while (isspace (*s)) s++;
+  while (isspace ((unsigned char) *s)) s++;
   first = s;
 
   i = 1;
@@ -163,12 +163,12 @@ str2vec (char *in)
 	  memmove (s, s+1, end-s-1);
 	  end--;
 	}
-      if (isspace (*s))
+      if (isspace ((unsigned char) *s))
 	{
 	  if (sq || dq)
 	    continue;
 	  *s++ = '\0';
-	  while (isspace (*s)) s++;
+	  while (isspace ((unsigned char) *s)) s++;
 	  if (*s)
 	    res[++i] = s;
 	}