configure: Add --with-extra flag to allow setting the extra version string.

Intended use in Fedora and RHEL is to encode the release
string, eg.

  ./configure [...] --with-extra="-%{release}"
(cherry picked from commit a4db75521d6026410425187fc2c5c9cb931a69b5)

diff --git a/configure.ac b/configure.ac
index 491053a..1bc1950 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -15,12 +15,12 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-# major/minor/release must be numbers
+# The major, minor, and release fields MUST be numbers.  Packagers can
+# add extra information using --with-extra="..." which may be any
+# freeform string.
 m4_define([libguestfs_major],   [1])
 m4_define([libguestfs_minor],   [10])
 m4_define([libguestfs_release], [8])
-# extra can be any string
-m4_define([libguestfs_extra],   [])
 
 AC_INIT([libguestfs],libguestfs_major.libguestfs_minor.libguestfs_release)
 AC_CONFIG_AUX_DIR([build-aux])
@@ -31,12 +31,6 @@ AM_SILENT_RULES([yes]) # make --enable-silent-rules the default.
 
 AC_CONFIG_MACRO_DIR([m4])
 
-dnl Split up the version string.
-AC_DEFINE([PACKAGE_VERSION_MAJOR],[libguestfs_major],[Major version number])
-AC_DEFINE([PACKAGE_VERSION_MINOR],[libguestfs_minor],[Minor version number])
-AC_DEFINE([PACKAGE_VERSION_RELEASE],[libguestfs_release],[Release number])
-AC_DEFINE([PACKAGE_VERSION_EXTRA],["libguestfs_extra"],[Extra version string])
-
 dnl Stable or unstable version?
 AC_MSG_CHECKING([if this is a stable or unstable branch of libguestfs])
 AS_IF([test "$((libguestfs_minor % 2))" -eq 0 ],[
@@ -53,6 +47,22 @@ please see the section "LIBGUESTFS VERSION NUMBERS" in guestfs(3).
 ***])
        ])
 
+dnl Extra string, a freeform string defined by packagers.
+AC_ARG_WITH([extra],
+  [AS_HELP_STRING([--with-extra],
+                  [extra version string (for use by packagers)])],
+  [libguestfs_extra="$withval"],
+  [libguestfs_extra=]
+)
+
+AC_MSG_NOTICE([libguestfs version libguestfs_major.libguestfs_minor.libguestfs_release$libguestfs_extra])
+
+dnl Split up the version string.
+AC_DEFINE([PACKAGE_VERSION_MAJOR],[libguestfs_major],[Major version number])
+AC_DEFINE([PACKAGE_VERSION_MINOR],[libguestfs_minor],[Minor version number])
+AC_DEFINE([PACKAGE_VERSION_RELEASE],[libguestfs_release],[Release number])
+AC_DEFINE_UNQUOTED([PACKAGE_VERSION_EXTRA],["$libguestfs_extra"],[Extra version string])
+
 dnl Early gnulib initialization.
 gl_EARLY
 gl_INIT