From 50e725ae23124a10d56a615fb8b0ae80d0d2b4d3 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 16 Jun 2020 13:07:31 +0200
Subject: Add metadata for exe{b}, including whether it is statically-linked

Use this information to omit ad hoc C++ recipe tests is testing statically-
linked build system.
---
 build2/b.cxx | 55 ++++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 42 insertions(+), 13 deletions(-)

(limited to 'build2/b.cxx')

diff --git a/build2/b.cxx b/build2/b.cxx
index bae40b6..930dbac 100644
--- a/build2/b.cxx
+++ b/build2/b.cxx
@@ -426,32 +426,61 @@ main (int argc, char* argv[])
       fail << e;
     }
 
-    // Initialize the diagnostics state.
+    // Handle --build2-metadata (see also buildfile).
     //
-    init_diag (verbosity (),
-               ops.silent (),
-               (ops.progress ()    ? optional<bool> (true)  :
-                ops.no_progress () ? optional<bool> (false) : nullopt),
-               ops.no_line (),
-               ops.no_column (),
-               fdterm (stderr_fd ()));
+#ifndef BUILD2_BOOTSTRAP
+    if (ops.build2_metadata_specified ())
+    {
+      auto& o (cout);
+
+      // Note that the export.metadata variable should be the first non-
+      // blank/comment line.
+      //
+      o << "# build2 buildfile b" << endl
+        << "export.metadata = 1 b" << endl
+        << "b.name = [string] b" << endl
+        << "b.version = [string] '" << LIBBUILD2_VERSION_FULL << '\'' << endl
+        << "b.checksum = [string] '" << LIBBUILD2_VERSION_FULL << '\'' << endl
+        << "b.static = [bool] " <<
+#ifdef LIBBUILD2_STATIC
+        "true"
+#else
+        "false"
+#endif
+        << endl;
+
+      return 0;
+    }
+#endif
 
     // Handle --version.
     //
     if (ops.version ())
     {
-      cout << "build2 " << LIBBUILD2_VERSION_ID << endl
-           << "libbutl " << LIBBUTL_VERSION_ID << endl
-           << "host " << BUILD2_HOST_TRIPLET << endl;
+      auto& o (cout);
+
+      o << "build2 " << LIBBUILD2_VERSION_ID << endl
+        << "libbutl " << LIBBUTL_VERSION_ID << endl
+        << "host " << BUILD2_HOST_TRIPLET << endl;
 
 #ifndef BUILD2_BOOTSTRAP
-      cout << "Copyright (c) " << BUILD2_COPYRIGHT << "." << endl;
+      o << "Copyright (c) " << BUILD2_COPYRIGHT << "." << endl;
 #endif
 
-      cout << "This is free software released under the MIT license." << endl;
+      o << "This is free software released under the MIT license." << endl;
       return 0;
     }
 
+    // Initialize the diagnostics state.
+    //
+    init_diag (verbosity (),
+               ops.silent (),
+               (ops.progress ()    ? optional<bool> (true)  :
+                ops.no_progress () ? optional<bool> (false) : nullopt),
+               ops.no_line (),
+               ops.no_column (),
+               fdterm (stderr_fd ()));
+
     // Handle --help.
     //
     if (ops.help ())
-- 
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