Amir Levy comments

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                                            Amir Levy

wasm-ld: warning: function signature mismatch when compiling with -flto=thin

Thanks, -Wl,--fatal-warnings solves the linker flags issue. Note that target_link_options(${target_name} PRIVATE "LINKER:--fatal-warnings") produces -Xlinker

wasm-ld: warning: function signature mismatch when compiling with -flto=thin

Still happens with 1.39.17

wasm-ld: warning: function signature mismatch when compiling with -flto=thin

It is specific to thin LTO, regular/full works. Since INTERPROCEDURAL_OPTIMIZATION produces -flto=thin, I think the toolchain (Emscripten.cmake) should change CMAKE_CXX_COMPILE_OPTIONS_IPO to full.

wasm-ld: warning: function signature mismatch when compiling with -flto=thin

https://github.com/emscripten-core/emscripten/pull/11517