[BYOC] Retire the example json runtime (apache#6177)

CMakeLists.txt

@@ -317,12 +317,6 @@ if(USE_VM_PROFILER)
   list(APPEND RUNTIME_SRCS ${RUNTIME_VM_PROFILER_SRCS})
 endif(USE_VM_PROFILER)
 
-if(USE_EXAMPLE_EXT_RUNTIME)
-  message(STATUS "Build with example external runtime...")
-  file(GLOB RUNTIME_EXAMPLE_EXTERNAL_SRCS src/runtime/contrib/example_ext_runtime/*.cc)
-  list(APPEND RUNTIME_SRCS ${RUNTIME_EXAMPLE_EXTERNAL_SRCS})
-endif(USE_EXAMPLE_EXT_RUNTIME)
-
 # Module rules
 include(cmake/modules/VTA.cmake)
 include(cmake/modules/StandaloneCrt.cmake)

cmake/config.cmake

@@ -221,9 +221,6 @@ set(USE_VTA_TSIM OFF)
 # Whether to build VTA FPGA driver (device side only)
 set(USE_VTA_FPGA OFF)
 
-# Whether to build the example external runtime module
-set(USE_EXAMPLE_EXT_RUNTIME OFF)
-
 # Whether to build TVM with TensorFlow's compile flags.
 # This is most commonly used to ensure ABI compatibility between TVM and TF.
 set(USE_TF_COMPILE_FLAGS OFF)

docs/dev/relay_bring_your_own_codegen.rst

@@ -625,7 +625,7 @@ The next step is to implement a customized runtime to make use of the output of
 Implement a Customized Runtime
 ==============================
 
-In this section, we will implement a customized TVM runtime step-by-step and register it to TVM runtime modules. The customized runtime should be located at ``src/runtime/contrib/<your-runtime-name>/``. In our example, we name our runtime "example_ext_runtime" and put it under `/src/runtime/contrib/example_ext_runtime/ <https://github.com/apache/incubator-tvm/blob/master/src/runtime/contrib/example_ext_runtime/example_ext_runtime.cc>`_. Feel free to check this file for a complete implementation.
+In this section, we will implement a customized TVM runtime step-by-step and register it to TVM runtime modules. The customized runtime should be located at ``src/runtime/contrib/<your-runtime-name>/``. In our example, we name our runtime "example_ext_runtime".
 
 Again, we first define a customized runtime class as follows. The class has to be derived from TVM ``ModuleNode`` in order to be compatible with other TVM runtime modules.