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Due to changes in LLVM 3.5 aliases now may only refer to definitions. Previously to handle symbols defined outside of the current commpilation unit GHC would emit both an `external` declaration, as well as an alias pointing to it, e.g., @stg_BCO_info = external global i8 @stg_BCO_info$alias = alias private i8* @stg_BCO_info Where references to `stg_BCO_info` will use the alias `stg_BCO_info$alias`. This is not permitted under the new alias behavior, resulting in errors resembling, Alias must point to a definition i8* @"stg_BCO_info$alias" To fix this, we invert the naming relationship between aliases and definitions. That is, now the symbol definition takes the name `@stg_BCO_info$def` and references use the actual name, `@stg_BCO_info`. This means the external symbols can be handled by simply emitting an `external` declaration, @stg_BCO_info = external global i8 Whereas in the case of a forward declaration we emit, @stg_BCO_info = alias private i8* @stg_BCO_info$def Reviewed By: austin Differential Revision: https://phabricator.haskell.org/D155
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