From 647492377897cf3b7d112d99e9a961a0f786a6b8 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 30 Mar 2011 13:08:56 +0200
Subject: Add autotools test for SQLite unlock notify feature

---
 configure.ac                   |  6 ++++++
 m4/libsqlite.m4                | 22 ++++++++++++++++++++++
 odb/sqlite/details/config.h.in |  1 +
 3 files changed, 29 insertions(+)

diff --git a/configure.ac b/configure.ac
index c99dab6..269564d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -34,6 +34,12 @@ LIBSQLITE(
   [],
   [AC_MSG_ERROR([libsqlite3 is not found; consider using CPPFLAGS/LDFLAGS to specify its location])])
 
+AS_IF([test x$libsqlite_unlock_notify = xyes],
+AC_DEFINE([LIBODB_SQLITE_HAVE_UNLOCK_NOTIFY], [1], [Have sqlite3_unlock_notify.]))
+
+AS_IF([test x$threads != xnone -a x$libsqlite_unlock_notify = xno],
+AC_MSG_WARN([libsqlite3 is built without sqlite3_unlock_notify support; multi-threaded support will be limited]))
+
 # Check for libodb.
 #
 LIBODB([],[AC_MSG_ERROR([libodb is not found; consider using --with-libodb=DIR])])
diff --git a/m4/libsqlite.m4 b/m4/libsqlite.m4
index 2ad9eb1..acb4fe3 100644
--- a/m4/libsqlite.m4
+++ b/m4/libsqlite.m4
@@ -5,9 +5,12 @@ dnl license   : GNU GPL v2; see accompanying LICENSE file
 dnl
 dnl LIBSQLITE([ACTION-IF-FOUND[,ACTION-IF-NOT-FOUND]])
 dnl
+dnl Also sets libsqlite_unlock_notify to yes if sqlite3_unlock_notify()
+dnl functionality is available.
 dnl
 AC_DEFUN([LIBSQLITE], [
 libsqlite_found=no
+libsqlite_unlock_notify=no
 
 AC_MSG_CHECKING([for libsqlite3])
 
@@ -37,6 +40,25 @@ if test x"$libsqlite_found" = xno; then
   LIBS="$save_LIBS"
 fi
 
+# Check for unlock_notify.
+#
+if test x"$libsqlite_found" = xyes; then
+CXX_LIBTOOL_LINK_IFELSE(
+AC_LANG_SOURCE([[
+#include <sqlite3.h>
+
+int
+main ()
+{
+  sqlite3* handle (0);
+  sqlite3_unlock_notify (handle, 0, 0);
+}
+]]),
+[
+libsqlite_unlock_notify=yes
+])
+fi
+
 if test x"$libsqlite_found" = xyes; then
   AC_MSG_RESULT([yes])
   $1
diff --git a/odb/sqlite/details/config.h.in b/odb/sqlite/details/config.h.in
index ff8c029..7e3eb4a 100644
--- a/odb/sqlite/details/config.h.in
+++ b/odb/sqlite/details/config.h.in
@@ -10,5 +10,6 @@
 #define ODB_SQLITE_DETAILS_CONFIG_H
 
 #undef LIBODB_SQLITE_STATIC_LIB
+#undef LIBODB_SQLITE_HAVE_UNLOCK_NOTIFY
 
 #endif /* ODB_SQLITE_DETAILS_CONFIG_H */
-- 
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