From a3592b51221a614de21aad20eeed69d8d13e83a8 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 1 Mar 2022 15:12:13 +0200
Subject: Add support for --std=c++20

---
 odb/odb.cxx          | 5 +++++
 odb/option-types.cxx | 5 ++++-
 odb/option-types.hxx | 3 ++-
 odb/options.cli      | 6 +++++-
 4 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/odb/odb.cxx b/odb/odb.cxx
index 9c9a175..701f6e1 100644
--- a/odb/odb.cxx
+++ b/odb/odb.cxx
@@ -707,6 +707,11 @@ main (int argc, char* argv[])
           args[3] = "-std=c++1z";
           break;
         }
+      case cxx_version::cxx20:
+        {
+          args[3] = "-std=c++2a";
+          break;
+        }
       }
     }
 
diff --git a/odb/option-types.cxx b/odb/option-types.cxx
index aac0288..c4a030b 100644
--- a/odb/option-types.cxx
+++ b/odb/option-types.cxx
@@ -18,7 +18,8 @@ static const char* cxx_version_[] =
   "c++98",
   "c++11",
   "c++14",
-  "c++17"
+  "c++17",
+  "c++20"
 };
 
 string cxx_version::
@@ -43,6 +44,8 @@ operator>> (istream& is, cxx_version& v)
       v = cxx_version::cxx14;
     else if (s == "c++17")
       v = cxx_version::cxx17;
+    else if (s == "c++20")
+      v = cxx_version::cxx20;
     else
       is.setstate (istream::failbit);
   }
diff --git a/odb/option-types.hxx b/odb/option-types.hxx
index 4739892..869fc83 100644
--- a/odb/option-types.hxx
+++ b/odb/option-types.hxx
@@ -22,7 +22,8 @@ struct cxx_version
     cxx98,
     cxx11,
     cxx14,
-    cxx17
+    cxx17,
+    cxx20
   };
 
   cxx_version (value v = value (0)) : v_ (v) {}
diff --git a/odb/options.cli b/odb/options.cli
index bb8797b..17ee438 100644
--- a/odb/options.cli
+++ b/odb/options.cli
@@ -309,11 +309,15 @@ class options
 
   // Language.
   //
+  // @@ TODO: perhaps we should switch to latest to match how we build
+  //          runtime by default?
+  //
   cxx_version --std = cxx_version::cxx98
   {
     "<version>",
     "Specify the C++ standard that should be used during compilation.
-     Valid values are \cb{c++98} (default), \cb{c++11}, and \cb{c++14}."
+     Valid values are \cb{c++98} (default), \cb{c++11}, \cb{c++14},
+     \cb{c++17}, and \cb{c++20}."
   };
 
   // Diagnostics.
-- 
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