varasm.c (mergeable_string_section): Don't try to move zero-length strings to the merge section.

2018-10-10  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * varasm.c (mergeable_string_section): Don't try to move zero-length
        strings to the merge section.

From-SVN: r265025

gcc/ChangeLog

+2018-10-10  Bernd Edlinger  <bernd.edlinger@hotmail.de>
+
+	* varasm.c (mergeable_string_section): Don't try to move zero-length
+	strings to the merge section.
+
 2018-10-10  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/87573

gcc/varasm.c

@@ -804,7 +804,7 @@ mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
       && TREE_CODE (decl) == STRING_CST
       && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
       && align <= 256
-      && (len = int_size_in_bytes (TREE_TYPE (decl))) >= 0
+      && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
       && TREE_STRING_LENGTH (decl) == len)
     {
       scalar_int_mode mode;