Fix bug with empty Wasm file when using system binaryen for optimization #179
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| let mut optimized_wasm_file = File::create(optimized.as_os_str())?; | ||
| optimized_wasm_file.write_all(&optimized_wasm)?; |
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This was the bug: the optimized Wasm file was created here and the returned bytes from do_optimization written into it.
But:
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This was only necessary for the
do_optimizationfunction enabled withfeature = "binaryen-as-dependency". -
For the
do_optimizationfunction enabled withnot(feature = "binaryen-as-dependency")thewasm-optcli was already invoked with-o optimized-wasm-file‒ thus already creating the file.
Consequently the returned bytes from the function were always empty. I first tried to fix this bug by havingwasm-optreturn a raw bytestream, but found a bug inwasm-optwhich currently prevents this: wasm-opt fails when-ois omitted, instead of writing to stdout as fallback WebAssembly/binaryen#3579.
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Maybe it would also make sense to invoke our tests with --features=binaryen-as-dependency as well as without.
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@ascjones The regression which you found is unfortunately a bug which was introduced when making the
binaryendependency opt-in.I've added a number of asserts now and fixed it.