cross compile problem about srpc

[holmes1412]

编译srpc需要依赖workflow作为third_party。请问git clone https://github.com/sogou/srpc.git时是否有带上--recursive呢？

如果已经clone完了，可以通过执行命令：git submodule update --init --recursive初始化刚才没有拉下来的third_party，然后再试试～

有什么进展欢迎反馈，谢谢～

[ouclbc]

我下载的时候带着--recursive

Add the installation prefix of "Workflow" to CMAKE_PREFIX_PATH or set
"Workflow_DIR" to a directory containing one of the above files. If
"Workflow" provides a separate development package or SDK, be sure it has
been installed.

[holmes1412]

1、你执行make的路径是在srpc根目录吗？
2、cd workflow看看里边有东西么？

[holmes1412]

我试了一下，如果没有--recursive拉代码的话，确实会有找不到third_party的错误，比如我这里会：

CMake Error at src/CMakeLists.txt:41 (find_package):
  Could not find a package configuration file provided by "Snappy" (requested
  version 1.1.6) with any of the following names:

    SnappyConfig.cmake
    snappy-config.cmake

  Add the installation prefix of "Snappy" to CMAKE_PREFIX_PATH or set
  "Snappy_DIR" to a directory containing one of the above files.  If "Snappy"
  provides a separate development package or SDK, be sure it has been
  installed.

然后你的报错那行是srpc/src的CMakeLists.txt：find_package(Workflow REQUIRED CONFIG HINTS ../workflow)
也就是说如果srpc/workflow/这个目录下如果有workflow-config.cmake.in，就会生成workflow-config.cmake

所以麻烦确认下srpc根目录下的workflow目录里是否有东西?

[ouclbc]

linux x86下设置交叉编译环境，完整的错误：
mkdir -p build.cmake
cd build.cmake && cmake /home/barton/holly/srpc
CMake Warning at CMakeLists.txt:45 (find_package):
By not providing "FindSnappy.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "Snappy", but
CMake did not find one.

Could not find a package configuration file provided by "Snappy" with any
of the following names:

SnappyConfig.cmake
snappy-config.cmake

Add the installation prefix of "Snappy" to CMAKE_PREFIX_PATH or set
"Snappy_DIR" to a directory containing one of the above files. If "Snappy"
provides a separate development package or SDK, be sure it has been
installed.

CMake Error at src/CMakeLists.txt:33 (find_package):
Could not find a package configuration file provided by "Workflow" with any
of the following names:

WorkflowConfig.cmake
workflow-config.cmake

Add the installation prefix of "Workflow" to CMAKE_PREFIX_PATH or set
"Workflow_DIR" to a directory containing one of the above files. If
"Workflow" provides a separate development package or SDK, be sure it has
been installed.
在cmakelist.txt里面设置set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/third_party/snappy;${CMAKE_SOURCE_DIR}/workflow;${CMAKE_MODULE_PATH}")好像也不行

[holmes1412]

按说src/CMakeLists.txt里的find_package()里已经制定了HINTS的路径才对。
要不你试试set一下Snappy_DIR和Workflow_DIR，看看ok吗？

[ouclbc]

本地可以编译过，但是交叉编译有问题。set一下Snappy_DIR和Workflow_DIR好像不起作用。

[holmes1412]

我们不懂交叉编译，所以还得请你多帮定位🙏

我看workflow的交叉编译有一个小伙伴提过一个PR：https://github.com/sogou/workflow/pull/655/files 虽然现在你已经编译好workflow了，但不知道这个改动有可以参考的地方吗？比如设置CMAKE_FIND_ROOT_PATH这种。

另外问了下GPT，基本也是建议改这两个：

cmake -DCMAKE_PREFIX_PATH=/path/to/cross/toolchain ..

或者

set(Workflow_DIR "/path/to/cross/toolchain/lib/cmake/Workflow")
find_package(Workflow REQUIRED CONFIG)

要么是否可以先安装workflow、snappy、lz4，然后再编译srpc，从系统里找依赖？

[ouclbc]

非常感谢你们这边及时的回答，我这边再排查一下cmake的执行流程，看看哪里有问题。

[holmes1412]

好的，有任何进展欢迎反馈，感谢～

[ouclbc]

我这边在src/CMakelist.txt里面设置绝对路径：set(Workflow_DIR "/home/barton/holly/srpc/workflow")编译通过了，另外请问一下这个srpc怎么切换是brpc还是Thrift 这种有文档说明么？我们想用在嵌入式设备上

[holmes1412]

太好了～

关于收发协议，可以参考这两个文档：
https://github.com/sogou/srpc/blob/master/docs/docs-03-server.md
https://github.com/sogou/srpc/blob/master/docs/docs-04-client.md

比如你在文档里看到SRPCServer/SRPCClient，那就是SRPC协议+protobuf，如果你是用BRPCServer/BRPCClient，那么就是brpc，如此类推。你可以把tutorial编译出来，有各个协议对应的写法和示例可以run～