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-rw-r--r--absl/base/attributes.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/absl/base/attributes.h b/absl/base/attributes.h
index cf2cb550..4a8581e1 100644
--- a/absl/base/attributes.h
+++ b/absl/base/attributes.h
@@ -524,6 +524,13 @@
// ABSL_ATTRIBUTE_UNUSED
//
// Prevents the compiler from complaining about variables that appear unused.
+//
+// For code or headers that are assured to only build with C++17 and up, prefer
+// just using the standard '[[maybe_unused]]' directly over this macro.
+//
+// Due to differences in positioning requirements between the old, compiler
+// specific __attribute__ syntax and the now standard [[maybe_unused]], this
+// macro does not attempt to take advantage of '[[maybe_unused]]'.
#if ABSL_HAVE_ATTRIBUTE(unused) || (defined(__GNUC__) && !defined(__clang__))
#undef ABSL_ATTRIBUTE_UNUSED
#define ABSL_ATTRIBUTE_UNUSED __attribute__((__unused__))