[PATCH 2/4] ref-manual/variables.rst: document missing SDK_*_ARCH variables

[Antonin Godard <antonin.godard@bootlin.com>]

These variables control the flags for the assembler, compiler and linker
when building for nativesdk recipes.

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
---
 documentation/ref-manual/variables.rst | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 24b3f7db9..4063fda8c 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -7793,11 +7793,21 @@ system and gives an overview of their function and contents.
 
       Only one archive type can be specified.
 
+   :term:`SDK_AS_ARCH`
+      Specifies architecture-specific assembler flags when building
+      :ref:`ref-classes-nativesdk` recipes. By default, the value of
+      :term:`SDK_AS_ARCH` equals the one of :term:`BUILD_AS_ARCH`.
+
    :term:`SDK_BUILDINFO_FILE`
       When using the :ref:`ref-classes-image-buildinfo` class,
       specifies the file in the SDK to write the build information into. The
       default value is "``/buildinfo``".
 
+   :term:`SDK_CC_ARCH`
+      Specifies the architecture-specific C compiler flags when building
+      :ref:`ref-classes-nativesdk` recipes. By default, the value of
+      :term:`SDK_CC_ARCH` equals the one of :term:`BUILD_CC_ARCH`.
+
    :term:`SDK_CUSTOM_TEMPLATECONF`
       When building the extensible SDK, if :term:`SDK_CUSTOM_TEMPLATECONF` is set to
       "1" and a ``conf/templateconf.cfg`` file exists in the :term:`Build Directory`
@@ -7879,6 +7889,11 @@ system and gives an overview of their function and contents.
       :term:`SDK_EXT_TYPE` is set to "minimal", and defaults to "1" if
       :term:`SDK_EXT_TYPE` is set to "full".
 
+   :term:`SDK_LD_ARCH`
+      Specifies architecture-specific linker flags when building
+      :ref:`ref-classes-nativesdk` recipes. By default, the value of
+      :term:`SDK_LD_ARCH` equals the one of :term:`BUILD_LD_ARCH`.
+
    :term:`SDK_NAME`
       The base name for SDK output files. The default value (as set in
       ``meta-poky/conf/distro/poky.conf``) is derived from the

-- 
2.47.0