CODEWITHSUNDEEP
c++cmakemoduleazerothcore
Alex Ly
Alex Ly

Reputation: 139

How to configure an AzerothCore module to link with the external library?

I am developing a module, which depends on another library(wasmtime). I put files into:

The problem which I faced is that when I compile the acore server with

./acore.sh compiler all

it gives me the error:

[100%] Linking CXX executable worldserver
/usr/bin/ld: ../../../modules/libmodules.a(ModWasm.cpp.o): in function `readWasmFile(char const*)':
ModWasm.cpp:(.text+0x63): undefined reference to `wasm_byte_vec_new_uninitialized'
/usr/bin/ld: ModWasm.cpp:(.text+0xce): undefined reference to `wasm_byte_vec_delete'

The question is it required somehow add to a config that library? If yes, then how to do that?

I was testing my code in simple main.cpp file and it was working with options like "-L${workspaceFolder}/lib" and "-lwasmtime". Maybe, these options are also required for my module?

Here is a link to azerothcore project which I use. my module locates in modules/mod-wasm folder

azerothcore-wotlk/modules ‹master*› » tree -L 3 mod-wasm
mod-wasm
├── CMakeLists.txt
├── LICENSE
├── Makefile
├── README.md
├── conf
│   ├── conf.sh.dist
│   └── wasm.conf.dist
├── include.sh
├── mod-wasm.cmake
├── setup_git_commit_template.sh
├── src
│   ├── ModWasm.cpp
│   ├── include
│   │   ├── doc-wasm.h
│   │   ├── wasi.h
│   │   ├── wasm.h
│   │   ├── wasmtime
│   │   ├── wasmtime.h
│   │   └── wasmtime.hh
│   ├── lib
│   │   ├── libwasmtime.a
│   │   └── libwasmtime.so
│   └── wasm_loader.cpp
└── wasm_modules
    └── rust_wasm_app.wasm

As I understood from the logs what I see and because CMakeList.txt exists in modules folder, the project considers the folder as module. Which in its turn scans subdirs for *.cmake files and configures the project.

The question now is how to properly configure my module to show that it contains the compiled library wasmtime inside src/lib folder? As I understood, I could use target_link_libraries, but it requires a target name, and I have no idea what it should be and where I can take it.

Upvotes: 2

Views: 363

Answers (1)

Alex Ly
Alex Ly

Reputation: 139

At the end, I was able to find an answer with try and catch. Azerothcore modules supports modname.cmake file to be run when configure libmodules.a which contains all extra modules(if I understood it correctly. this is part of modules/CMakeFiles.txt

# Enables Devs to Include a cmake file in their module that will get run inline with the config.
foreach(SOURCE_MODULE ${MODULES_MODULE_LIST})
message("SOURCE_MODULE: ${SOURCE_MODULE}")
    include("${CMAKE_SOURCE_DIR}/modules/${SOURCE_MODULE}/${SOURCE_MODULE}.cmake" OPTIONAL)
endforeach()

here I have my dirty cmake file which allow me to compile the server

set(WASM_MODULE_DIR ${CMAKE_SOURCE_DIR}/modules/${SOURCE_MODULE})
set(WASM_MODULE_SRC_DIR ${WASM_MODULE_DIR}/src)

message("--------------------->>>>> APPLICATION_NAME : ${APPLICATION_NAME}")
message("--------------------->>>>> APP_PROJECT_NAME : ${APP_PROJECT_NAME}")
message("--------------------->>>>> SOURCE_MODULE : ${SOURCE_MODULE}")
message("--------------------->>>>> WASM_MODULE_DIR : ${WASM_MODULE_DIR}")
message("--------------------->>>>> WASM_MODULE_SRC_DIR : ${WASM_MODULE_SRC_DIR}")
# include wasmtime
target_include_directories(modules PUBLIC ${WASM_MODULE_SRC_DIR}/include)
target_link_directories(modules PUBLIC ${WASM_MODULE_SRC_DIR}/lib)

find_library(LIBWASMTIME_TO_INCLUDE NAMES wasmtime PATHS ${WASM_MODULE_SRC_DIR}/lib REQUIRED)
message("--------------------->>>>>>>>> LIBWASMTIME_TO_INCLUDE: ${LIBWASMTIME_TO_INCLUDE}")
target_link_libraries(modules PUBLIC wasmtime)

So, it compiles now. But I have next problem, which I am trying to resolve. but this is another story.

Thank you all for the help

Upvotes: 2

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