Setting emcc options via emcmake?

[Steven Johnson]

If I am using emcmake to build an existing CMake-based executable, what's the right / best way to set emcc options? (e.g. -s ASSERTIONS=1 -s ENVIRONMENT=node)?

Random googling hasn't found a definitive answer. Some hits suggest that I can use target_compile_options() and/or target_link_opions() in my CMake build files to set these, but it would be nice if I could (also) just specify them on the command line (for cases where the CMake files aren't yet modified to be smart).

[Shlomi Fish]

Hi Steven!

On Wed, 27 Oct 2021 16:59:17 -0700
"'Steven Johnson' via emscripten-discuss" <emscripte...@googlegroups.com>
wrote:

Perhaps try using these:
https://emscripten.org/docs/tools_reference/emcc.html#environment-variables .
(Untested!)

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[Sam Clegg]

On Wed, Oct 27, 2021 at 4:59 PM 'Steven Johnson' via emscripten-discuss <emscripte...@googlegroups.com> wrote:

If I am using emcmake to build an existing CMake-based executable, what's the right / best way to set emcc options? (e.g. -s ASSERTIONS=1 -s ENVIRONMENT=node)?

Random googling hasn't found a definitive answer. Some hits suggest that I can use target_compile_options() and/or target_link_opions() in my CMake build files to set these, but it would be nice if I could (also) just specify them on the command line (for cases where the CMake files aren't yet modified to be smart).

We don't support anything special here, so the answer is the same as if you had asked "how to I pass extra compile and/or link flags to a cmake project".  

I think the answer is here: https://stackoverflow.com/questions/44284275/passing-compiler-options-cmake.  Do -DCMAKE_C_FLAGS=... and -DCMAKE_CXX_FLAGS=... work for you?

 

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[Floh]

You can handle emscripten specific options inside an if-block which check that CMAKE_SYSTEM_NAME is "Emscripten". For example see here at the start and towards the end of the CMakeLists.txt file:

https://github.com/floooh/pacman.c/blob/main/CMakeLists.txt