Steven Wu a32dd9539b [Modules] Avoid false swift module sharing ...

When the swiftmodule is built with different clang importer arguments,
they can have the same module hash, causing them to be wrongly re-used even
they contains different interfaces. Add ReducedExtraArgs to the module hash to
disambiguate them.

However, some Xcc arguments, most commonly `-D` options do not affect the
swiftmodule being generated. Do not pass `-Xcc -DARGS` to swift
interface compilation to reduce the amount of module variants in the
build.

rdar://131408266

2024-07-10 14:48:12 -07:00

118 KiB

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