ref-manual: classes.rst: improvements to cmake class documentation

- Fix quoting for path to cmake modules
- Document OECMAKE_GENERATOR variable
- Style simplifications

(From yocto-docs rev: ecdc1775e27717ec87442575f65b1f24ca2b0348)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reviewed-by: Quentin Schulz <foss+yocto@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 62176f7ee8..c204f49aac 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -5399,6 +5399,16 @@ system and gives an overview of their function and contents.
       :term:`Source Directory` for details on how this class
       applies these additional sed command arguments.
 
+   :term:`OECMAKE_GENERATOR`
+      A variable for the :ref:`ref-classes-cmake` class, allowing to choose
+      which back-end will be generated by CMake to build an application.
+
+      By default, this variable is set to ``Ninja``, which is faster than GNU
+      make, but if building is broken with Ninja, a recipe can use this
+      variable to use GNU make instead::
+
+         OECMAKE_GENERATOR = "Unix Makefiles"
+
    :term:`OE_IMPORTS`
       An internal variable used to tell the OpenEmbedded build system what
       Python modules to import for every Python function run by the system.