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Add a tunable to remove symbols from *.cwasm files - #13630

#13630
Merged
alexcrichton merged 3 commits into
bytecodealliance:mainbytecodealliance/wasmtime:mainfrom
alexcrichton:remove-symbolt-ablealexcrichton/wasmtime:remove-symbolt-ableCopy head branch name to clipboard
Jun 15, 2026
Merged

Add a tunable to remove symbols from *.cwasm files#13630
alexcrichton merged 3 commits into
bytecodealliance:mainbytecodealliance/wasmtime:mainfrom
alexcrichton:remove-symbolt-ablealexcrichton/wasmtime:remove-symbolt-ableCopy head branch name to clipboard

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@alexcrichton

@alexcrichton alexcrichton commented Jun 13, 2026

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This commit adds a tunable option via -Dsymbols={y,n} or Config::debug_symbols to disable generation of symbols in output *.cwasm artifacts. This can help minimize the size of an artifact to the absolute bare minimum in some scenarios.

This additionally adds documentation of how to build a minimal *.cwasm with all the various options that can be used which affect the output artifact.

Closes #10286

This commit adds a tunable option via `-Dsymbols={y,n}` or
`Config::debug_symbols` to disable generation of symbols in output
`*.cwasm` artifacts. This can help minimize the size of an artifact to
the absolute bare minimum in some scenarios.

This additionally adds documentation of how to build a minimal `*.cwasm`
with all the various options that can be used which affect the output artifact.
@alexcrichton
alexcrichton requested review from a team as code owners June 13, 2026 00:19
@alexcrichton
alexcrichton requested review from fitzgen and removed request for a team June 13, 2026 00:19
@github-actions github-actions Bot added fuzzing Issues related to our fuzzing infrastructure wasmtime:api Related to the API of the `wasmtime` crate itself wasmtime:config Issues related to the configuration of Wasmtime wasmtime:docs Issues related to Wasmtime's documentation winch Winch issues or pull requests labels Jun 13, 2026
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cc @fitzgen, @saulecabrera

Details This issue or pull request has been labeled: "fuzzing", "wasmtime:api", "wasmtime:config", "wasmtime:docs", "winch"

Thus the following users have been cc'd because of the following labels:

  • fitzgen: fuzzing
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Label Messager: wasmtime:config

It looks like you are changing Wasmtime's configuration options. Make sure to
complete this check list:

  • If you added a new Config method, you wrote extensive documentation for
    it.

    Details

    Our documentation should be of the following form:

    Short, simple summary sentence.
    
    More details. These details can be multiple paragraphs. There should be
    information about not just the method, but its parameters and results as
    well.
    
    Is this method fallible? If so, when can it return an error?
    
    Can this method panic? If so, when does it panic?
    
    # Example
    
    Optional example here.
    
  • If you added a new Config method, or modified an existing one, you
    ensured that this configuration is exercised by the fuzz targets.

    Details

    For example, if you expose a new strategy for allocating the next instance
    slot inside the pooling allocator, you should ensure that at least one of our
    fuzz targets exercises that new strategy.

    Often, all that is required of you is to ensure that there is a knob for this
    configuration option in wasmtime_fuzzing::Config (or one
    of its nested structs).

    Rarely, this may require authoring a new fuzz target to specifically test this
    configuration. See our docs on fuzzing for more details.

  • If you are enabling a configuration option by default, make sure that it
    has been fuzzed for at least two weeks before turning it on by default.


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@fitzgen fitzgen left a comment

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r=me with below addressed

Comment thread crates/wasmtime/src/config.rs
Comment thread docs/examples-minimal-cwasm.md Outdated
Comment thread docs/examples-minimal-cwasm.md Outdated
Comment thread docs/examples-minimal-cwasm.md Outdated
Comment thread docs/examples-minimal-cwasm.md Outdated
Comment thread docs/examples-minimal-cwasm.md Outdated
Comment thread docs/examples-minimal-cwasm.md Outdated
Comment thread docs/examples-minimal-cwasm.md Outdated
@alexcrichton

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All excellent suggestions, thanks!

@alexcrichton
alexcrichton enabled auto-merge June 15, 2026 17:59
@alexcrichton
alexcrichton added this pull request to the merge queue Jun 15, 2026
Merged via the queue into bytecodealliance:main with commit 8fb7955 Jun 15, 2026
51 checks passed
@alexcrichton
alexcrichton deleted the remove-symbolt-able branch June 15, 2026 18:36
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fuzzing Issues related to our fuzzing infrastructure wasmtime:api Related to the API of the `wasmtime` crate itself wasmtime:config Issues related to the configuration of Wasmtime wasmtime:docs Issues related to Wasmtime's documentation winch Winch issues or pull requests

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Investigate removing symbol table from *.cwasm

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