From e919b652af622fcfc59e850a25c08acfda567466 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Tue, 16 Aug 2022 19:09:04 +0300
Subject: [PATCH] Disable __VA_OPT__ on g++ 8/9 in c++2a mode, as vaopt.cpp
 fails

---
 include/boost/preprocessor/variadic/has_opt.hpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/boost/preprocessor/variadic/has_opt.hpp b/include/boost/preprocessor/variadic/has_opt.hpp
index b2cceff..7054e94 100644
--- a/include/boost/preprocessor/variadic/has_opt.hpp
+++ b/include/boost/preprocessor/variadic/has_opt.hpp
@@ -17,10 +17,14 @@
 # /* BOOST_PP_VARIADIC_HAS_OPT */
 #
 # if defined(__cplusplus) && __cplusplus > 201703L
-# include <boost/preprocessor/variadic/detail/has_opt.hpp>
-# define BOOST_PP_VARIADIC_HAS_OPT() \
+#  if defined(__GNUC__) && !defined(__clang__) && __GNUC__ >= 8 && __GNUC__ < 10
+#   define BOOST_PP_VARIADIC_HAS_OPT() 0
+#  else
+#   include <boost/preprocessor/variadic/detail/has_opt.hpp>
+#   define BOOST_PP_VARIADIC_HAS_OPT() \
   BOOST_PP_VARIADIC_HAS_OPT_ELEM2(BOOST_PP_VARIADIC_HAS_OPT_FUNCTION(?),) \
 /**/
+#  endif
 # else
 # define BOOST_PP_VARIADIC_HAS_OPT() 0
 # endif