[wasm-split] Allow empty string for options#8243
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aheejin merged 5 commits intoWebAssembly:mainfrom Jan 28, 2026
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We weren't able to give empty strings as options like `--import-namespace=` or `--import-namespace=""` so far because 1. When `command-line.cpp` parses `--option=`, it parses the next option as its value. For example, if we have `wasm-split ... --import-namespace -o output.wasm`, it parses `-o` as the value for `--import-namespace`. 2. Even if we fix 1, many places in `wasm-split.cpp` checks for `if (options.optionName.size())` so the option with size 0 cannot be processed. This fixes them and allow `--import-namespace` and other similar options take an empty string for a value. Since WebAssembly#7966 changed the default primary export namespace to `primary`, acx_gallery failed to run (which I realized it only recently) and giving it `--import-namespace=""` didn't work because of the above reasons.
tlively
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Jan 27, 2026
src/tools/wasm-split/split-options.h
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| std::string importNamespace; | ||
| bool hasImportNamespace = false; |
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Let's make these all std::optional<std::string> instead of having separate bools.
tlively
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Jan 28, 2026
| #define wasm_tools_wasm_split_options_h | ||
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| #include "tools/tool-options.h" | ||
| #include <optional> |
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This system include should go above the non-system includes.
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We weren't able to give empty strings as options like
--import-namespace=or--import-namespace=""so far becausecommand-line.cppparses--option=, it parses the next option as its value. For example, if we havewasm-split ... --import-namespace -o output.wasm, it parses-oas the value for--import-namespace.wasm-split.cppchecks forif (options.optionName.size())so the option with size 0 cannot be processed.This fixes them and allow
--import-namespaceand other similar options take an empty string for a value.Since #7966 changed the default primary export namespace to
primary, acx_gallery failed to run (which I realized it only recently) because it assumed the empty string namespace, and giving it--import-namespace=""didn't work because of the above reasons.