[6.3] Wasm: bump default stack size to 128K #2030
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The default of 64K is too low, especially as tail calls are not available by default on Wasm. It also means Swift Testing is unusable in `main` development snapshots due to stack overflows. rdar://160218251
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The current invocation as is leads to `wasm-ld: error: unknown argument: --stack-size=131072`
Adjust `SwiftDriverTests/testLinking` for correct CLI options format.
al45tair
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Dec 1, 2025
MaxDesiatov
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Dec 1, 2025
Sources/SwiftDriver/Jobs/WebAssemblyToolchain+LinkerSupport.swift
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Cherry-pick of #2026.
Explanation: The default of 64K for stack size is too low, especially as tail calls are not available by default on Wasm. It also means Swift Testing is unusable in
maindevelopment snapshots due to stack overflows.Scope: Limited to Wasm support.
Risk: Low due to isolated scope.
Testing: Added automated end-to-end test in swiftlang/swift-integration-tests#167.
Issue: rdar://160218251
Reviewer: @kateinoigakukun