使用CMake时如何在Emscripten中导出C函数 [英] How to export C function in Emscripten when using CMake
本文介绍了使用CMake时如何在Emscripten中导出C函数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在本教程中它显示了以下导出C函数的示例
In this tutorial it shows the following example for exporting C functions
./emcc tests/hello_function.cpp -o function.html -s EXPORTED_FUNCTIONS='["_int_sqrt"]' -s EXPORTED_RUNTIME_METHODS='["ccall", "cwrap"]'
除了我像这样使用CMake之外,我想做同样的事情
I would like to do the same except that I use CMake like this
cd bin
emcmake cmake ../src
emmake make
在emmake中指定 -s
的规范方法是什么?我是否应该将其添加到 CMakeLists.txt
之类的
What is the canonical way of specifying -s
in emmake? Should I add it to CMakeLists.txt
like
set(EXPORTED_FUNCTIONS '["_int_sqrt"]')
还是做类似的事情?
推荐答案
到目前为止,我发现可以通过以下设置实现CMake
What I figured out so far is that it can be achieved CMake with the following settings
# Here you can add -s flag during compiling object files
add_definitions("-s EXPORTED_RUNTIME_METHODS='[\"ccall\",\"cwrap\"]'")
add_definitions("-s EXTRA_EXPORTED_RUNTIME_METHODS='[\"ccall\",\"cwrap\"]'")
add_definitions("-s EXPORTED_FUNCTIONS='[\"_testInt\"]'")
# Here you can add -s flag during linking
set_target_properties(web_mealy_compiler PROPERTIES LINK_FLAGS "-s EXTRA_EXPORTED_RUNTIME_METHODS=['ccall','cwrap']")
# Set this if you want to to generate sample html file
set(CMAKE_EXECUTABLE_SUFFIX ".html")
然后,您应该能够从javascript调用C函数,如下所示:
Then you should be able to call C functions from javascript as follows:
<script type="text/javascript">
Module['onRuntimeInitialized'] = function() {
console.log("wasm loaded ");
console.log(Module.ccall); // make sure it's not undefined
console.log(Module._testInt); // make sure it's not undefined
console.log(Module._testInt()); // this should work
console.log( Module.ccall('testInt', // name of C function
'number', // return type
[], // argument types
[]) // argument values
);
}
</script>
这是我对C函数的定义:
And this is my definition of C function:
#include <emscripten.h>
EMSCRIPTEN_KEEPALIVE
int testInt(){
return 69420;
}
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