Change Details

Builds that error out on duplicate symbols can still succeed if the symbols will be dead stripped. Currently, this is the current behavior in ld64. https://github.com/apple-oss-distributions/ld64/blob/main/src/ld/Resolver.cpp#L2018. While it's strange for a linker to require `-dead_strip` in order for a link to succeed, it's far better to align with ld64's behavior to be closer as a drop-in replacement. Move the duplicate symbol check after mark live so we can use this information to determine whether we should error on the specified duplicate symbol.

Builds that error out on duplicate symbols can still succeed if the symbols will be dead stripped. Currently, this is the current behavior in ld64. https://github.com/apple-oss-distributions/ld64/blob/main/src/ld/Resolver.cpp#L2018. In order to provide an easier to path for adoption, introduce a new flag that will retain compatibility with ld64's behavior (similar to `--deduplicate-literals`). This is turned off by default since we do not encourage this behavior in the linker.

Builds that error out on duplicate symbols can still succeed if the symbols will be dead stripped. Currently, this is the current behavior in ld64. https://github.com/apple-oss-distributions/ld64/blob/main/src/ld/Resolver.cpp#L2018. While it's strange for a linker to require `-dead_strip` in order for a link to succeed, it's far better to align with ld64's behavior to be closer as a drop-in replacement.In order to provide an easier to path for adoption, introduce a new flag that will retain compatibility with ld64's behavior (similar to `--deduplicate-literals`). This is Move the duplicate symbol check after mark live so we can use this information toturned off by default since we do not encourage this behavior in the linker. determine whether we should error on the specified duplicate symbol.