configure.ac, lib: rename "extra" (version) to "development stage"

"Extra" is a term which we'll use for something else brought by a
subsequent patch.

I took the "development stage" term from
<https://en.wikipedia.org/wiki/Software_release_life_cycle#Stages_of_development>,
where "Release candidate" is one of the stages.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Change-Id: I285fbf9851cde41a520079b4c31cdc5d8bf32412
Reviewed-on: https://review.lttng.org/c/babeltrace/+/2835
Reviewed-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Tested-by: jenkins <jenkins@lttng.org>

configure.ac

@@ -29,8 +29,8 @@ AC_PREREQ([2.50])
 m4_define([bt_version_major], [2])
 m4_define([bt_version_minor], [0])
 m4_define([bt_version_patch], [0])
-m4_define([bt_version_extra], [-rc4])
-m4_define([bt_version], bt_version_major[.]bt_version_minor[.]bt_version_patch[]bt_version_extra)
+m4_define([bt_version_dev_stage], [-rc4])
+m4_define([bt_version], bt_version_major[.]bt_version_minor[.]bt_version_patch[]bt_version_dev_stage)
 m4_define([bt_version_name], [])
 m4_define([bt_version_description], [])
 
@@ -52,7 +52,7 @@ AC_CONFIG_MACRO_DIR([m4])
 AC_DEFINE([BT_VERSION_MAJOR], bt_version_major, [Babeltrace major version])
 AC_DEFINE([BT_VERSION_MINOR], bt_version_minor, [Babeltrace minor version])
 AC_DEFINE([BT_VERSION_PATCH], bt_version_patch, [Babeltrace patch version])
-AC_DEFINE([BT_VERSION_EXTRA], ["]bt_version_extra["], [Babeltrace extra version])
+AC_DEFINE([BT_VERSION_DEV_STAGE], ["]bt_version_dev_stage["], [Babeltrace version development stage (can be empty)])
 AC_DEFINE([BT_VERSION_NAME], ["]bt_version_name["], [Babeltrace version name])
 AC_DEFINE([BT_VERSION_DESCRIPTION], ["]bt_version_description["], [Babeltrace version description])
 

include/babeltrace2/version.h

@@ -50,8 +50,8 @@ library's version:
   <dt>Patch version</dt>
   <dd>bt_version_get_patch()</dd>
 
-  <dt>Extra information</dt>
-  <dd>bt_version_get_extra()</dd>
+  <dt>Development stage</dt>
+  <dd>bt_version_get_development_stage()</dd>
 </dl>
 
 You can also get the version's name and description if available with
@@ -89,15 +89,15 @@ extern unsigned int bt_version_get_patch(void);
 
 /*!
 @brief
-    Returns extra information about the version of libbabeltrace2.
+    Returns the development stage of libbabeltrace2's version.
 
-This extra information can contain a version suffix such as
+The development stage \em can contain a version suffix such as
 <code>-pre5</code> or <code>-rc1</code>.
 
 @returns
-    Extra information about the library's version, or \c NULL if none.
+    Development stage of the library's version, or \c NULL if none.
 */
-extern const char *bt_version_get_extra(void);
+extern const char *bt_version_get_development_stage(void);
 
 /*!
 @brief

src/lib/babeltrace2.c

@@ -36,13 +36,14 @@ unsigned int bt_version_get_minor(void)
 	return BT_VERSION_MINOR;
 }
 
-unsigned int bt_version_get_patch(void) {
+unsigned int bt_version_get_patch(void)
+{
 	return BT_VERSION_PATCH;
 }
 
-const char *bt_version_get_extra(void)
+const char *bt_version_get_development_stage(void)
 {
-	return strlen(BT_VERSION_EXTRA) == 0 ? NULL : BT_VERSION_EXTRA;
+	return strlen(BT_VERSION_DEV_STAGE) == 0 ? NULL : BT_VERSION_DEV_STAGE;
 }
 
 const char *bt_version_get_name(void)

src/lib/logging.c

@@ -58,8 +58,8 @@ void bt_logging_set_global_level(enum bt_logging_level log_level)
 static
 void __attribute__((constructor)) bt_logging_ctor(void)
 {
-	const char *v_extra = bt_version_get_extra() ? bt_version_get_extra() :
-		"";
+	const char *v_extra = bt_version_get_development_stage() ?
+		bt_version_get_development_stage() : "";
 
 	bt_logging_set_global_level(
 		bt_log_get_level_from_env("LIBBABELTRACE2_INIT_LOG_LEVEL"));