Rename version.h to libweston/version.h

This is an installed public header, and without the subdir would surely
conflict with something else.

include/libweston/meson.build is necessary for putting the generated header in
the right subdirectory so that '#include <libweston/version.h>' can work.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

include/libweston/meson.build

@@ -17,3 +17,15 @@ backend_wayland_h =  files('backend-wayland.h')
 backend_x11_h =      files('backend-x11.h')
 
 xwayland_api_h = files('xwayland-api.h')
+
+libweston_version_h = configuration_data()
+libweston_version_h.set('WESTON_VERSION_MAJOR', version_weston_arr[0])
+libweston_version_h.set('WESTON_VERSION_MINOR', version_weston_arr[1])
+libweston_version_h.set('WESTON_VERSION_MICRO', version_weston_arr[2])
+libweston_version_h.set('WESTON_VERSION', version_weston)
+version_h = configure_file(
+	input: 'version.h.in',
+	output: 'version.h',
+	configuration: libweston_version_h
+)
+install_headers(version_h, subdir: dir_include_libweston_install)

include/libweston/version.h.in

@@ -0,0 +1,50 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef WESTON_VERSION_H
+#define WESTON_VERSION_H
+
+#define WESTON_VERSION_MAJOR @WESTON_VERSION_MAJOR@
+#define WESTON_VERSION_MINOR @WESTON_VERSION_MINOR@
+#define WESTON_VERSION_MICRO @WESTON_VERSION_MICRO@
+#define WESTON_VERSION "@WESTON_VERSION@"
+
+/* This macro may not do what you expect.  Weston doesn't guarantee
+ * a stable API between 1.X and 1.Y, and thus this macro will return
+ * FALSE on any WESTON_VERSION_AT_LEAST(1,X,0) if the actual version
+ * is 1.Y.0 and X != Y).  In particular, it fails if X < Y, that is,
+ * 1.3.0 is considered to not be "at least" 1.4.0.
+ *
+ * If you want to test for the version number being 1.3.0 or above or
+ * maybe in a range (eg 1.2.0 to 1.4.0), just use the WESTON_VERSION_*
+ * defines above directly.
+ */
+
+#define WESTON_VERSION_AT_LEAST(major, minor, micro) \
+        (WESTON_VERSION_MAJOR == (major) && \
+         WESTON_VERSION_MINOR == (minor) && \
+         WESTON_VERSION_MICRO >= (micro))
+
+#endif