build: Read version number from VERSION file

CMakeLists.txt

@@ -1,14 +1,12 @@
 cmake_minimum_required(VERSION 3.18)
 
-file(STRINGS "configure.ac" CONFIGURE_AC_LINES)
-foreach(line ${CONFIGURE_AC_LINES})
-    if(line MATCHES [[^m4_define\(\[(MAJOR_VERSION|MINOR_VERSION|MICRO_VERSION)\],[ \t]*([0-9]+)\)$]])
-        set(LIBXML_${CMAKE_MATCH_1} ${CMAKE_MATCH_2})
-    elseif(line MATCHES "^(LIBXML_MAJOR_VERSION|LIBXML_MINOR_VERSION|LIBXML_MICRO_VERSION)=([0-9]+)$")
-        set(${CMAKE_MATCH_1} ${CMAKE_MATCH_2})
-    endif()
-endforeach()
-set(VERSION "${LIBXML_MAJOR_VERSION}.${LIBXML_MINOR_VERSION}.${LIBXML_MICRO_VERSION}")
+file(READ "VERSION" VERSION)
+string(STRIP ${VERSION} VERSION)
+if(${VERSION} MATCHES [[([0-9]+)\.([0-9]+)\.([0-9]+)]])
+    set(LIBXML_MAJOR_VERSION ${CMAKE_MATCH_1})
+    set(LIBXML_MINOR_VERSION ${CMAKE_MATCH_2})
+    set(LIBXML_MICRO_VERSION ${CMAKE_MATCH_3})
+endif()
 
 project(libxml2 VERSION ${VERSION} LANGUAGES C)
 

MAINTAINERS.md

@@ -50,8 +50,7 @@ You can get started by running
 
 ### Bump the version number
 
-Edit the version numbers in `configure.ac` and `meson.build` if you
-haven't done so already.
+Update the version number in `VERSION` if you haven't done so already.
 
 ### Build the tarball
 

VERSION

@@ -0,0 +1 @@
+2.14.0

configure.ac

@@ -1,21 +1,19 @@
 dnl Process this file with autoconf to produce a configure script.
 AC_PREREQ([2.63])
 
-m4_define([MAJOR_VERSION], 2)
-m4_define([MINOR_VERSION], 14)
-m4_define([MICRO_VERSION], 0)
+m4_define([version_macro], m4_normalize(m4_include([VERSION])))
 
-AC_INIT([libxml2],[MAJOR_VERSION.MINOR_VERSION.MICRO_VERSION])
+AC_INIT([libxml2],[version_macro])
 AC_CONFIG_SRCDIR([entities.c])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CANONICAL_HOST
 
-LIBXML_MAJOR_VERSION=MAJOR_VERSION
-LIBXML_MINOR_VERSION=MINOR_VERSION
-LIBXML_MICRO_VERSION=MICRO_VERSION
+LIBXML_VERSION=version_macro
+LIBXML_MAJOR_VERSION=`echo $LIBXML_VERSION | cut -d . -f 1`
+LIBXML_MINOR_VERSION=`echo $LIBXML_VERSION | cut -d . -f 2`
+LIBXML_MICRO_VERSION=`echo $LIBXML_VERSION | cut -d . -f 3`
 LIBXML_MICRO_VERSION_SUFFIX=
-LIBXML_VERSION=$LIBXML_MAJOR_VERSION.$LIBXML_MINOR_VERSION.$LIBXML_MICRO_VERSION$LIBXML_MICRO_VERSION_SUFFIX
 
 # The oldest minor version we are compatible with.
 LIBXML_MINOR_COMPAT=0

meson.build

@@ -1,7 +1,7 @@
 project(
     'libxml2',
     'c',
-    version: '2.13.0',
+    version: files('VERSION'),
     license: 'MIT',
     default_options: ['buildtype=debug', 'warning_level=3'],
     meson_version: '>= 0.61',