From e241c2d3aac91c6845fe33df0630fd7294be72ce Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Sat, 4 Apr 2020 22:58:47 +0300
Subject: Make use of project configuration variable for specifying database
 client library

---
 build/root.build    | 26 ++++++++++++++++++++++++++
 odb/mysql/buildfile | 10 +++-------
 2 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/build/root.build b/build/root.build
index ba74c09..49d1911 100644
--- a/build/root.build
+++ b/build/root.build
@@ -1,6 +1,32 @@
 # file      : build/root.build
 # license   : GNU GPL v2; see accompanying LICENSE file
 
+# Configure which database client library to use for build2 versions greater
+# than 0.12.0 and always use MySQL client library otherwise (due to the lack
+# of the project configuration variables support).
+#
+if ($build.version.number > 12000000000)
+{
+  # Whether to use the MySQL or MariaDB client library.
+  #
+  config [string] config.libodb_mysql.client_lib ?= 'mysql'
+
+  # Verify the config.libodb_mysql.client_lib configuration variable value and
+  # provide the short alias for it.
+  #
+  switch $config.libodb_mysql.client_lib
+  {
+    case 'mysql'
+    case 'mariadb'
+      client_lib = $config.libodb_mysql.client_lib
+
+    default
+      fail "invalid config.libodb_mysql.client_lib value '$config.libodb_mysql.client_lib'"
+  }
+}
+else
+  client_lib = 'mysql'
+
 cxx.std = latest
 
 using cxx
diff --git a/odb/mysql/buildfile b/odb/mysql/buildfile
index 556caf1..2796103 100644
--- a/odb/mysql/buildfile
+++ b/odb/mysql/buildfile
@@ -1,15 +1,11 @@
 # file      : odb/mysql/buildfile
 # license   : GNU GPL v2; see accompanying LICENSE file
 
-client_lib = 'mysql'
-#client_lib = 'mariadb'
-
 import int_libs = libodb%lib{odb}
 
-if ($client_lib == 'mysql')
-  import int_libs += libmysqlclient%lib{mysqlclient}
-else
-  import int_libs += libmariadb%lib{mariadb}
+import int_libs += ($client_lib == 'mysql'            \
+                    ? libmysqlclient%lib{mysqlclient} \
+                    : libmariadb%lib{mariadb})
 
 lib{odb-mysql}: {hxx ixx txx cxx}{* -version-build2} {hxx}{version-build2}   \
         details/{hxx ixx txx cxx}{* -options} details/{hxx ixx cxx}{options} \
-- 
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