add more info about -warn-common

diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index d2ce5920b7c7dea218190ad390e80b067748ef46..84f89730ee1c50f3005defcb52d3f89e37c182e0 100644 (file)
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -586,6 +586,8 @@ Warn when a common symbol is combined with another common symbol or with
 a symbol definition.  Unix linkers allow this somewhat sloppy practice,
 but linkers on some other operating systems do not.  This option allows
 you to find potential problems from combining global symbols.
+Unfortunately, some C libraries use this practice, so you may get some
+warnings about symbols in the libraries as well as in your programs.
 
 There are three kinds of global symbols, illustrated here by C examples: