adt-manual, ref-manual: Review edits for xcross-toolchain additions.

Mark Hatle reviewed the section and I updated some things based
off his input.  A rewrite to the "Makefile-Based Projects" section
to get it technically correct.  Also, removed all SDKROOT
documentation from both the adt-manual and ref-manual.

Fixes [YOCTO #7133]

(From yocto-docs rev: dd785777834611d94868a3774f2eb21ffc081b1a)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/adt-manual/adt-command.xml

@@ -210,19 +210,28 @@
 <title>Makefile-Based Projects</title>
 
     <para>
-        For Makefile-based projects, you make sure your
+        For Makefile-based projects, the cross-toolchain environment
-        <filename>Makefile</filename> has statements that ensure proper
+        variables established by running the cross-toolchain environment
-        use of the cross-toolchain.
+        setup script override any settings you might have in your
-        For example, the following statements inside a
+        <filename>Makefile</filename>.
-        <filename>Makefile</filename> ensure the C compiler, linker, flags
+        For example, if you had settings such as the following in your
-        passed to the C compiler, and flags passed to the C++ compiler are
+        <filename>Makefile</filename>, the environment variables defined
-        specifically defined for the build:
+        by the script would override them:
         <literallayout class='monospaced'>
      <ulink url='&YOCTO_DOCS_REF_URL;#var-CC'>CC</ulink>=arm-poky-linux-gnueabi-gcc
      <ulink url='&YOCTO_DOCS_REF_URL;#var-LD'>LD</ulink>=arm-poky-linux-gnueabi-ld
      <ulink url='&YOCTO_DOCS_REF_URL;#var-CFLAGS'>CFLAGS</ulink>=”${CFLAGS} --sysroot=&lt;sysroot-dir&gt;”
      <ulink url='&YOCTO_DOCS_REF_URL;#var-CXXFLAGS'>CXXFLAGS</ulink>=”${CXXFLAGS} --sysroot=&lt;sysroot-dir&gt;”
         </literallayout>
+        Consequently, you should not set variables like
+        <ulink url='&YOCTO_DOCS_REF_URL;#var-CC'><filename>CC</filename></ulink>
+        and
+        <ulink url='&YOCTO_DOCS_REF_URL;#var-LD'><filename>LD</filename></ulink>
+        in your <filename>Makefile</filename>.
+        For the list of variables set up by the cross-toolchain environment
+        setup script, see the
+        "<link linkend='setting-up-the-cross-development-environment'>Setting Up the Cross-Development Environment</link>"
+        section.
     </para>
 </section>
 

documentation/adt-manual/adt-prepare.xml

@@ -423,7 +423,6 @@
         When you run the setup script, many environment variables are
         defined:
         <literallayout class='monospaced'>
-     <ulink url='&YOCTO_DOCS_REF_URL;#var-SDKROOT'><filename>SDKROOT</filename></ulink> - The path to the installed SDK
      <ulink url='&YOCTO_DOCS_REF_URL;#var-SDKTARGETSYSROOT'><filename>SDKTARGETSYSROOT</filename></ulink> - The path to the sysroot used for cross-compilation
      <ulink url='&YOCTO_DOCS_REF_URL;#var-PKG_CONFIG_PATH'><filename>PKG_CONFIG_PATH</filename></ulink> - The path to the target pkg-config files
      <ulink url='&YOCTO_DOCS_REF_URL;#var-CONFIG_SITE'><filename>CONFIG_SITE</filename></ulink> - A GNU autoconf site file preconfigured for the target

documentation/ref-manual/ref-variables.xml

@@ -9276,17 +9276,6 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
             </glossdef>
         </glossentry>
 
-        <glossentry id='var-SDKROOT'><glossterm><imagedata fileref="figures/define-generic.png" />SDKROOT</glossterm>
-            <info>
-                SDKROOT[doc] = "The path to the installed SDK."
-            </info>
-            <glossdef>
-                <para>
-                    Defines the path to the installed SDK.
-                </para>
-            </glossdef>
-        </glossentry>
-
         <glossentry id='var-SDKTARGETSYSROOT'><glossterm><imagedata fileref="figures/define-generic.png" />SDKTARGETSYSROOT</glossterm>
             <info>
                 SDKTARGETSYSROOT[doc] = "Path to the sysroot used for cross-compilation."