Ubuntu 23-04 (Lunar) has g++ v13.0.1 (in the universe section,
this is not the default g++ compiler).
At least as curently shipped, this warns about the line
[[clang::fallthrough]];
(partly becuase with the default settings
[[fallthrough]];
is now needed to silence warnings where a fallthrough *is* intended).
Based on https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109653#c3
I have attached a patch for ports/cpl_port.h
--
Andrew C. Aitchison Kendal, UK
and...@aitchison.me.ukdiff --git a/port/cpl_port.h b/port/cpl_port.h
index 41fd67bc0a..7bba9ab3c7 100644
--- a/port/cpl_port.h
+++ b/port/cpl_port.h
@@ -1129,6 +1129,15 @@ extern "C++"
#define HAVE_GCC_SYSTEM_HEADER
#endif
+#if defined __has_cpp_attribute
+# if __has_cpp_attribute (clang::fallthrough)
+# define CPL_FALLTHROUGH [[clang::fallthrough]]
+# elif __has_cpp_attribute (gnu::fallthrough)
+# define CPL_FALLTHROUGH [[gnu::fallthrough]]
+# elif __has_cpp_attribute (fallthrough)
+# define CPL_FALLTHROUGH [[fallthrough]]
+# endif
+#else
#if ((defined(__clang__) && \
(__clang_major__ > 3 || \
(__clang_major__ == 3 && __clang_minor__ >= 7))) || \
@@ -1139,6 +1148,7 @@ extern "C++"
/** Macro for fallthrough in a switch case construct */
#define CPL_FALLTHROUGH
#endif
+#endif
/*! @cond Doxygen_Suppress */
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