maint: give a new function the "pure" attribute

* src/digest.c (problematic_chars): This recently introduced
function does not modify state so is pure, even though GCC 13.1 at least
did not warn about that attribute being appropriate.

diff --git a/src/digest.c b/src/digest.c
index 5490f96a49e1bf4b2e3ca1d36047fb5ca9cce349..e80eb3406a9b2c74bc531de076bba9c6fd9cccbd 100644 (file)
--- a/src/digest.c
+++ b/src/digest.c
@@ -564,6 +564,7 @@ or equivalent standalone program.\
    that need escaping.  Note we escape '\' itself to provide some forward
    compat to introduce escaping of other characters.  */
 
+ATTRIBUTE_PURE
 static bool
 problematic_chars (char const *s)
 {