Help: Document CMAKE_OBJDUMP variable

Help/command/file.rst

@@ -1337,7 +1337,7 @@ Handling Runtime Binaries
     the actual path to ``objdump``, ``dumpbin``, or ``otool``.
 
     If this variable is not specified, it is determined by the value of
-    ``CMAKE_OBJDUMP`` if set, else by system introspection.
+    :variable:`CMAKE_OBJDUMP` variable if set, else by system introspection.
 
     .. versionadded:: 3.18
-      Use ``CMAKE_OBJDUMP`` if set.
+      Uses :variable:`CMAKE_OBJDUMP` if set.

Help/manual/cmake-variables.7.rst

@@ -93,6 +93,7 @@ Variables that Provide Information
    /variable/CMAKE_MINOR_VERSION
    /variable/CMAKE_NETRC
    /variable/CMAKE_NETRC_FILE
+   /variable/CMAKE_OBJDUMP
    /variable/CMAKE_PARENT_LIST_FILE
    /variable/CMAKE_PATCH_VERSION
    /variable/CMAKE_PROJECT_DESCRIPTION

Help/variable/CMAKE_OBJDUMP.rst

@@ -0,0 +1,16 @@
+CMAKE_OBJDUMP
+-------------
+
+Path to the ``objdump`` executable on the host system.  This tool, typically
+part of the Binutils collection on Unix-like systems, provides information
+about compiled object files.
+
+This cache variable may be populated by CMake when project languages are
+enabled using the :command:`project` or :command:`enable_language` commands.
+
+See Also
+^^^^^^^^
+
+* The :command:`file(GET_RUNTIME_DEPENDENCIES)` command provides a more general
+  way to get information from runtime binaries.
+* The :variable:`CPACK_OBJDUMP_EXECUTABLE` variable.