Adress comments

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b14a4dc..d46b6dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt

@@ -51,7 +51,10 @@
   CACHE STRING "Semicolon-separated list of HAL drivers to build, or \"all\"." FORCE)
 set(IREE_TARGET_BACKENDS_TO_BUILD "all"
   CACHE STRING "Semicolon-separated list of target backends to build, or \"all\"." FORCE)
-# LINT.ThenChange(https://github.com/google/iree/tree/master/build_tools/cmake/iree_cross_compile.cmake:iree_cross_compile_options)
+# LINT.ThenChange(
+#   https://github.com/google/iree/tree/master/build_tools/cmake/iree_cross_compile.cmake:iree_cross_compile_options,
+#   https://github.com/google/iree/tree/master/build_tools/cmake/iree_cross_compile.cmake:iree_cross_compile_invoke
+# )
 
 if(${IREE_BUILD_SAMPLES} OR ${IREE_BUILD_EXPERIMENTAL})
   set(IREE_BUILD_COMPILER ON CACHE BOOL "Build the IREE compiler for sample projects." FORCE)
@@ -149,7 +152,9 @@
 
   # Master configuration for the binary directory containing all artifacts
   # compiled for host.
-  set(IREE_HOST_BINARY_ROOT "${CMAKE_CURRENT_BINARY_DIR}/host")
+  if(NOT IREE_HOST_BINARY_ROOT)
+    set(IREE_HOST_BINARY_ROOT "${CMAKE_CURRENT_BINARY_DIR}/host" CACHE FILEPATH "directory containing host artifacts")
+  endif()
 
   set(IREE_HOST_BUILD_COMPILER ON) # For iree-translate
   set(IREE_HOST_ENABLE_LLVM ON)    # For iree-tblgen

diff --git a/build_tools/cmake/iree_cross_compile.cmake b/build_tools/cmake/iree_cross_compile.cmake
index 4b5e3df..2568abd 100644
--- a/build_tools/cmake/iree_cross_compile.cmake
+++ b/build_tools/cmake/iree_cross_compile.cmake

@@ -20,11 +20,11 @@
 # configuration means a new IREE CMake invocation with its own set of
 # parameters.
 #
-# This function defines two custom target, `iree_prepare_${CONFIG_NAME}_dir`
-# and `iree_configure_${CONFIG_NAME}`, to drive the creation of a directory
-# for hosting the new IREE configuration and its corresponding `CMakeCache.txt`
-# file, respectively. Callers can then depend on either the file or the
-# target to make sure the configuration is invoked as a dependency.
+# This function defines a custom target, `iree_configure_${CONFIG_NAME}`,
+# to drive the generation of a new IREE configuration's `CMakeCache.txt`
+# file. Callers can then depend on either the `CMakeCache.txt` file or the
+# `iree_configure_${CONFIG_NAME}` target to make sure the configuration
+# is invoked as a dependency.
 #
 # This function is typically useful when cross-compiling towards another
 # architecture. For example, when cross-compiling towards Android, we need
@@ -91,7 +91,10 @@
   # spaces.
   string(REPLACE ";" "$<SEMICOLON>" _CONFIG_HAL_DRIVERS_TO_BUILD "${IREE_HAL_DRIVERS_TO_BUILD}")
   string(REPLACE ";" "$<SEMICOLON>" _CONFIG_TARGET_BACKENDS_TO_BUILD "${IREE_TARGET_BACKENDS_TO_BUILD}")
-  # LINT.ThenChange(https://github.com/google/iree/tree/master/CMakeLists.txt:iree_options)
+  # LINT.ThenChange(
+  #   https://github.com/google/iree/tree/master/CMakeLists.txt:iree_options,
+  #   https://github.com/google/iree/tree/master/build_tools/cmake/iree_cross_compile.cmake:iree_cross_compile_invoke
+  # )
 
   message(STATUS "C compiler for ${CONFIG_NAME} build: ${_CONFIG_C_COMPILER}")
   message(STATUS "C++ compiler for ${CONFIG_NAME} build: ${_CONFIG_CXX_COMPILER}")
@@ -102,6 +105,7 @@
         -DCMAKE_BUILD_TYPE="${CMAKE_BUILD_TYPE}"
         -DCMAKE_C_COMPILER="${_CONFIG_C_COMPILER}"
         -DCMAKE_CXX_COMPILER="${_CONFIG_CXX_COMPILER}"
+        # LINT.IfChange(iree_cross_compile_invoke)
         -DIREE_ENABLE_RUNTIME_TRACING=${_CONFIG_ENABLE_RUNTIME_TRACING}
         -DIREE_ENABLE_MLIR=${_CONFIG_ENABLE_MLIR}
         -DIREE_ENABLE_EMITC=${_CONFIG_ENABLE_EMITC}
@@ -112,6 +116,10 @@
         -DIREE_BUILD_DEBUGGER=${_CONFIG_BUILD_DEBUGGER}
         -DIREE_BUILD_PYTHON_BINDINGS=${_CONFIG_BUILD_PYTHON_BINDINGS}
         -DIREE_BUILD_EXPERIMENTAL=${_CONFIG_BUILD_EXPERIMENTAL}
+        # LINT.ThenChange(
+        #   https://github.com/google/iree/tree/master/CMakeLists.txt:iree_options,
+        #   https://github.com/google/iree/tree/master/build_tools/cmake/iree_cross_compile.cmake:iree_cross_compile_options,
+        # )
         -DIREE_HAL_DRIVERS_TO_BUILD="${_CONFIG_HAL_DRIVERS_TO_BUILD}"
         -DIREE_TARGET_BACKENDS_TO_BUILD="${_CONFIG_TARGET_BACKENDS_TO_BUILD}"
     WORKING_DIRECTORY ${_CONFIG_BINARY_ROOT}

diff --git a/build_tools/cmake/iree_macros.cmake b/build_tools/cmake/iree_macros.cmake
index 6e4602b..7b27392 100644
--- a/build_tools/cmake/iree_macros.cmake
+++ b/build_tools/cmake/iree_macros.cmake

@@ -90,9 +90,9 @@
 
 # iree_get_executable_path
 #
-# Gets the path to an executable in a cross-compilation-aware way. This is
-# meant to be used for binaries that are used to generate source files and
-# can only be built on host.
+# Gets the path to an executable in a cross-compilation-aware way. This
+# should be used when accessing binaries that are used as part of the build,
+# such as for generating files used for later build steps.
 #
 # Paramters:
 # - OUTPUT_PATH_VAR: variable name for receiving the path to the built target.
@@ -210,9 +210,9 @@
 
 # iree_add_executable_dependencies
 #
-# Adds dependency to a target in a cross-compilation-aware way. This is meant
-# to be used for dependencies that are used to generate source files and can
-# only be built on host.
+# Adds dependency on a target in a cross-compilation-aware way. This should
+# be used for depending on targets that are used as part of the build, such
+# as for generating files used for later build steps.
 #
 # Parameters:
 # TARGET: the target to take on dependencies