doc: Update CMake and meson instructions

Author: nwellnhof

README.md

@@ -23,8 +23,7 @@ This code is released under the MIT License, see the Copyright file.
 
 ## Build instructions
 
-libxml2 can be built with GNU Autotools, CMake, meson or several other
-build systems in platform-specific subdirectories.
+libxml2 can be built with GNU Autotools, CMake or meson.
 
 ### Autotools (for POSIX systems like Linux, BSD, macOS)
 
@@ -101,12 +100,13 @@ update your list of installed shared libs.
 
 ### CMake (mainly for Windows)
 
-Another option for compiling libxml is using CMake:
+Example commands:
 
-    cmake -E tar xf libxml2-xxx.tar.gz
-    cmake -S libxml2-xxx -B libxml2-xxx-build [possible options]
-    cmake --build libxml2-xxx-build
-    cmake --install libxml2-xxx-build
+    cmake -E tar xf libxml2-xxx.tar.xz
+    cmake -S libxml2-xxx -B builddir [options]
+    cmake --build builddir
+    ctest --test-dir builddir
+    cmake --install builddir
 
 Common CMake options include:
 
@@ -122,31 +122,20 @@ directly in various IDEs such as CLion, QtCreator, or Visual Studio.
 
 ### Meson
 
-Still somewhat experimental, see
-[issue 743](https://gitlab.gnome.org/GNOME/libxml2/-/issues/743).
+Example commands:
 
-Libxml can also be built with meson. Without option, simply call
-
-    meson setup builddir
+    meson setup [options] builddir
     ninja -C builddir
-
-To add options, see the meson_options.txt file. For example:
-
-    meson setup \
-        -Dprefix=$prefix \
-        -Dhistory=enabled \
-        -Dhttp=enabled \
-        -Dschematron=disabled \
-        -Dzlib=enabled \
-        builddir
-
-To install libxml:
-
+    meson test -C builddir
     ninja -C builddir install
 
-To launch tests:
+See the `meson_options.txt` file for options. For example:
 
-    meson test -C builddir
+    -Dprefix=$prefix
+    -Dhistory=enabled
+    -Dhttp=enabled
+    -Dschematron=disabled
+    -Dzlib=enabled
 
 ## Dependencies