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-rw-r--r--tests/warn-on-use.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/tests/warn-on-use.h b/tests/warn-on-use.h
index 94f5b920..701013a0 100644
--- a/tests/warn-on-use.h
+++ b/tests/warn-on-use.h
@@ -1,5 +1,5 @@
/* A C macro for emitting warnings if a function is used.
- Copyright (C) 2010-2022 Free Software Foundation, Inc.
+ Copyright (C) 2010-2024 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
@@ -32,6 +32,10 @@
_GL_WARN_ON_USE_ATTRIBUTE is for functions with 'static' or 'inline'
linkage.
+ _GL_WARN_ON_USE should not be used more than once for a given function
+ in a given compilation unit (because this may generate a warning even
+ if the function is never called).
+
However, one of the reasons that a function is a portability trap is
if it has the wrong signature. Declaring FUNCTION with a different
signature in C is a compilation error, so this macro must use the