使用 CMake 内置 NDK 构建 Verilator (C++)

Question

我尝试了this 示例，但没有任何反应：

cmake_minimum_required(VERSION 3.8)
project(cmake_simulator)

set(CMAKE_SYSTEM_NAME Android)
set(CMAKE_SYSTEM_VERSION 21)
set(CMAKE_ANDROID_ARCH_ABI x86)
set(CMAKE_ANDROID_NDK /home/icarolima/Android/Sdk/ndk/21.3.6528147)
set(CMAKE_ANDROID_STL_TYPE gnustl_static)

set(CMAKE_TOOLCHAIN_FILE /home/icarolima/Android/Sdk/ndk/21.3.6528147/build/cmake/android.toolchain.cmake)

find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
if (NOT verilator_FOUND)
  message(FATAL_ERROR "Verilator was not found. Either install it, or set the VERILATOR_ROOT environment variable")
endif()

# Create a new executable target that will contain all your sources
add_library(simulator SHARED simulator.cpp)

# Add the Verilated circuit to the target
verilate(simulator
  INCLUDE_DIRS "."
  SOURCES top.sv
  VERILATOR_ARGS -Wno-CASEINCOMPLETE -Wno-WIDTH -Wno-COMBDLY -cc +1800-2012ext+sv)

例如，如果我将CMAKE_ANDROID_ARCH_ABI 更改为其他任何内容，则不会发生任何事情。就像 CMake 忽略了代码的 NDK 部分。

但是如果我将项目更改到另一个位置，就会发生不同的事情：

cmake_minimum_required(VERSION 3.8)

set(CMAKE_SYSTEM_NAME Android)
set(CMAKE_SYSTEM_VERSION 21)
set(CMAKE_ANDROID_ARCH_ABI x86)
set(CMAKE_ANDROID_NDK /home/icarolima/Android/Sdk/ndk/21.3.6528147)
set(CMAKE_ANDROID_STL_TYPE gnustl_static)

project(cmake_simulator)

set(CMAKE_TOOLCHAIN_FILE /home/icarolima/Android/Sdk/ndk/21.3.6528147/build/cmake/android.toolchain.cmake)

find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
if (NOT verilator_FOUND)
  message(FATAL_ERROR "Verilator was not found. Either install it, or set the VERILATOR_ROOT environment variable")
endif()

# Create a new executable target that will contain all your sources
add_library(simulator SHARED simulator.cpp)

# Add the Verilated circuit to the target
verilate(simulator
  INCLUDE_DIRS "."
  SOURCES top.sv
  VERILATOR_ARGS -Wno-CASEINCOMPLETE -Wno-WIDTH -Wno-COMBDLY -cc +1800-2012ext+sv)

错误：

CMake Error at /home/icarolima/Android/Sdk/cmake/3.10.2.4988404/share/cmake-3.10/Modules/Platform/Android/Determine-Compiler-NDK.cmake:97 (message):
  Android: No toolchain for ABI 'x86' found in the NDK:

    /home/icarolima/Android/Sdk/ndk/21.3.6528147

我没有使用 CMake 的经验，我认为问题在于事物的顺序。谁能帮帮我？

Answer 1

设置所有这些变量（例如CMAKE_SYSTEM_NAME、CMAKE_SYSTEM_VERSION、CMAKE_ANDROID_ARCH_ABI 等）应在工具链文件中进行。通过将这些放在 CMakeLists.txt 文件本身中，您肯定会遇到一些令人讨厌的 CMake 行为。您链接的 CMake 文档中甚至还有一个示例工具链文件 here。

另外，CMAKE_TOOLCHAIN_FILE 变量应该在调用cmake 时在命令行 上设置，而不是在CMake 文件本身中。这会将您的 CMakeLists.txt 文件缩减为以下内容：

cmake_minimum_required(VERSION 3.8)

project(cmake_simulator)
    
find_package(verilator HINTS $ENV{VERILATOR_ROOT} ${VERILATOR_ROOT})
if (NOT verilator_FOUND)
  message(FATAL_ERROR "Verilator was not found. Either install it, or set the VERILATOR_ROOT environment variable")
endif()

# Create a new executable target that will contain all your sources
add_library(simulator SHARED simulator.cpp)

# Add the Verilated circuit to the target
verilate(simulator
  INCLUDE_DIRS "."
  SOURCES top.sv
  VERILATOR_ARGS -Wno-CASEINCOMPLETE -Wno-WIDTH -Wno-COMBDLY -cc +1800-2012ext+sv)

然后，您应该调用cmake，指定要使用的工具链文件，如下所示：

cmake -DCMAKE_TOOLCHAIN_FILE=/home/icarolima/Android/Sdk/ndk/21.3.6528147/build/cmake/android.toolchain.cmake ..

Answer 2

所以，澄清一下，我解决它的方法可以在这里看到：Dockerfile，在这里：sandbox_template。

感谢@squareskittles 的回答！