1 files changed, 9 insertions, 1 deletions

diff --git a/gl/intprops.h b/gl/intprops.h
index 43734f34..2f9fa0a0 100644
--- a/gl/intprops.h
+++ b/gl/intprops.h
@@ -1,6 +1,6 @@
 /* intprops.h -- properties of integer types
 
-   Copyright (C) 2001-2024 Free Software Foundation, Inc.
+   Copyright (C) 2001-2025 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
@@ -34,6 +34,14 @@
    signed or floating type.  Do not evaluate E.  */
 #define EXPR_SIGNED(e) _GL_EXPR_SIGNED (e)
 
+/* The same value as as the arithmetic expression E, but with E's type
+   after integer promotions.  For example, if E is of type 'enum {A, B}'
+   then 'switch (INT_PROMOTE (E))' pacifies gcc -Wswitch-enum if some
+   enum values are deliberately omitted from the switch's cases.
+   Here, unary + is safer than a cast or inline function, as unary +
+   does only integer promotions and is disallowed on pointers.  */
+#define INT_PROMOTE(e) (+ (e))
+
 
 /* Minimum and maximum values for integer types and expressions.  */