From 016564a920683a7ef1957cc7cb025b70664e054d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 22 Jul 2019 14:07:25 +0200
Subject: Temporarily map C++ standard to c++17 in cxx-modules-ex GCC branch

---
 build2/cxx/init.cxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/build2/cxx/init.cxx b/build2/cxx/init.cxx
index 9db5817..01130d7 100644
--- a/build2/cxx/init.cxx
+++ b/build2/cxx/init.cxx
@@ -303,6 +303,10 @@ namespace build2
                                          ? "c++-modules"
                                          : "c++-modules-ex") != string::npos)
               {
+                // @@ TMP: currently there are some issues in the c++2a mode.
+                //
+                r.back () = "-std=c++17";
+
                 // Currently defines __cpp_modules=201810 which is said to
                 // correspond to p1103 (merged modules).
                 //
-- 
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