I have some C and C++ knowledge and I am bad at compiling(I have always 
used IDEs in the past to compile code).


I tried a simple example on Emscripten website about Fetch Api ( 
https://emscripten.org/docs/api_reference/fetch.html    The first example 
here)

I put the code info main.cpp file and tried compiling the code using:

emcc main.cpp -s FETCH=1

It gave the errors:

warning: unresolved symbol: emscripten_fetch_close
warning: unresolved symbol: emscripten_fetch_att_init
warning: unresolved symbol: emscripten_fetch 

I downloaded the file emscripten_fetch.cpp from github and put it into the 
same directory with main.cpp then tried compiling using:

emcc main.cpp emcc_fetch.cpp -s FETCH=1

This time the error messages changed to:

warning:unresolved symbol: emscripten_is_main_browser_thread
warning:unresolved symbol: emscripten_start_fetch
warning:unresolved symbol: _emscripten_fetch_free


When I viewed the file emscripten_fetch.cpp, I saw that although these 
functions are either called or declared
, they seem like they are not defined in the file.










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