The codebase I'm porting to WebAssembly is mostly C, rather than C++, and
parts of it are decades old. I'm having to clean up places where it gets
clever with function calling, to get rid of function signature mismatches.

Today I'm trying -sEMULATE_FUNCTION_POINTER_CASTS=1, which produces this
error:

Fatal: max-func-params needs to be at least 26Fatal: max-func-params needs
to be at least 26
em++: error:
'/sdl/prairie/tools/kernel_tools/webasm/emscripten/v4.0.21/emsdk/upstream/bin/wasm-opt
--fpcast-emu /u/jgd/regimes/webasm_vdevel/kid.wasm -o
/u/jgd/regimes/webasm_vdevel/kid.wasm -g --mvp-features --enable-threads
--enable-bulk-memory --enable-bulk-memory-opt
--enable-call-indirect-overlong --enable-multivalue
--enable-mutable-globals --enable-nontrapping-float-to-int
--enable-reference-types --enable-sign-ext' failed (returned 1)
Warning: Error building /u/jgd/regimes/webasm_vdevel/kid.js

It appears wasm-opt needs to be given a bigger value for "max-func-params"
Binaryen *appears* to be the same software as wasm-opt, but confirmation of
that would be good.

I tried --max-func-params=30, and that gave me:

Fatal: max-func-params needs to be at least 17
em++: error:
'/sdl/prairie/tools/kernel_tools/webasm/emscripten/v4.0.21/emsdk/upstream/bin/wasm-opt
--fpcast-emu /u/jgd/regimes/webasm_vdevel/kid.wasm -o
/u/jgd/regimes/webasm_vdevel/kid.wasm -g --mvp-features --enable-threads
--enable-bulk-memory --enable-bulk-memory-opt
--enable-call-indirect-overlong --enable-multivalue
--enable-mutable-globals --enable-nontrapping-float-to-int
--enable-reference-types --enable-sign-ext' failed (returned 1)
Warning: Error building /u/jgd/regimes/webasm_vdevel/kid.js

Yes, that is what I'm seeing. Specifying 30 parameters produces an error
asking for a *lower* minimum. The manpage I found for wasm-opt at Debian
doesn't have an option for setting the maximum number of parameters that I
can see.
https://manpages.debian.org/experimental/binaryen/wasm-opt.1.en.html

How do I set a higher maximum number of parameters?

My full command line is:

em++ -pthread -Wcast-function-type --pre-js
/Parasolid/lx86/tools/patssy/com/kid_node_prerun.js -sMAXIMUM_MEMORY=4000MB
-sEXPORTED_FUNCTIONS=ENV,_main -sALLOW_MEMORY_GROWTH -sSTACK_SIZE=4096KB
-sNODERAWFS -sEXIT_RUNTIME=1 -sENVIRONMENT=node --emit-symbol-map
-sSTRICT=1 -sINCOMING_MODULE_JS_API=preRun -pthread -sSUPPORT_LONGJMP=1
-sDEFAULT_PTHREAD_STACK_SIZE=1MB -sEMULATE_FUNCTION_POINTER_CASTS=1
--max-func-params=30 -sASSERTIONS=1 -sSAFE_HEAP=0
/Parasolid/lx86/vdevel_webasm/lsp/kernel.o clu/clu_gra_structure.o
gra/gra_structure.o lop/lop_deform_operations.o vol/vol_offset.o
/shamrock/sw_tools/lib/webasm/aga_fix.o
/Parasolid/lx86/vdevel_webasm/system/release/kid_support.a
/Parasolid/lx86/vdevel_webasm/system/release/pskernel_archive.a -o
/u/jgd/regimes/webasm_vdevel/kid.js

Thanks,

John Dallman

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