'generating debug info with emscripten / ninja / cmake on complex project

I am trying to debug a port of some c and c++ code to WASM. I worked out how to source level debug in the browser with a simple 10 line .c program but now I want to make that work with a non trivial code base. (mixed c and c++). The wasm code works in a simple app but not in my more complex use case, hence the need to debug it

I use CMake to generate ninja build files

Here is where I am setting flags in my CMakeLists.txt

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} \
  -s MODULARIZE=1 \
  -s SINGLE_FILE=1 \
  -s EXPORT_NAME=aubio \
  -g --bind")

this was basically copied from the original codebase (the -g instead of -Oz is mine), I am not a CMake nor ninja nor emscripten wizard. When I build this I can see that the CXX flags are not passed to the emc++ compile passes, only to the 'linker' phase

I am not even sure where the -g (perhaps with source-map) needs to be for a multi-file project 'linked' into a single file. Should it be on the compile passes or the link pass , or maybe both. But certainly at the moment I do not get any symbols anywhere, no 'map' file(s) (embedded DWARF?, since the browser plugin claims to support it)

cmakewebassemblyemscripten


Solution 1:[1]

set(CMAKE_BUILD_TYPE Debug)

seems to embed DWARF to WASM file.

I don't know why set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g") nor target_compile_options(foo PUBLIC -g) doesn't work in Release build.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 zakki

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