WebAssembly template size bold and export un wanted symbol!

[Radu]

On Friday, 10 August 2018 at 06:41:51 UTC, learnfirst1 wrote:
> I try to build WebAssembly project, the wasm size is grow into 
> 300kb even with "-Os -inline -release -noboundscheck".
>
>
> there is a lot symbol like:
>
> _foreachbody2MFPSQDfQDd10GameAssertZQBnMFPSQEfQEd10GameMethodZQCnMFPSQFfQFd12S2OptionZi
>
>
> To build a c base game engine the size only like 90kb,  to 
> build with D there is not so much login the size already be 
> huge.
>
>
> And the LLD is not inline  function for WASM like linux static 
> binary format.
>
> How can we cut down the size so we can make the LDC  generate 
> WASM more deploy friendly.
>
>
> Hidden un want symbol can cut down the size huge,  since WASM 
> really don't want to expose internal symbol.   I think some 
> option like https://github.com/ldc-developers/ldc/issues/2431  
> will be great.
>
> Please share your opinion.

Indeed there will be dead code left in the binary. This example 
shows that the foreach body gets inlined but the symbol emitted 
is still present.

https://godbolt.org/g/hwU8Zf

I think this will get solved by newer LLD (LLVM linker), I see 
that they added a `-gc-sections` option. 
https://github.com/llvm-mirror/lld/blob/master/wasm/Options.td#L70