For reconcat, if the `optr` can only be used as the last one
of string list, aka, we cannot append something to it.
Let's add some note into the document.
libiberty:
* concat.c (reconcat): Add note about append string to NULL
into document.
---
libiberty/concat.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libiberty/concat.c b/libiberty/concat.c
index 4cb1df3baf3..3a6b4ca71e8 100644
--- a/libiberty/concat.c
+++ b/libiberty/concat.c
@@ -169,6 +169,9 @@ loop:
str = reconcat (str, "pre-", str, NULL);
@end example
+Note: don't try to append string(s) to the a NULL string,
+as the process will stop at the first NULL argument.
+
@end deftypefn
*/
--
2.39.2
