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authorIain Sandoe <iain@sandoe.co.uk>2022-06-03 10:43:38 +0100
committerIain Sandoe <iain@sandoe.co.uk>2023-03-29 08:52:28 +0530
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re-land [C++20][Modules] Introduce an implementation module.
We need to be able to distinguish individual TUs from the same module in cases where TU-local entities either need to be hidden (or, for some cases of ADL in template instantiation, need to be detected as exposures). This creates a module type for the implementation which implicitly imports its primary module interface per C++20: [module.unit/8] 'A module-declaration that contains neither an export-keyword nor a module-partition implicitly imports the primary module interface unit of the module as if by a module-import-declaration. Implementation modules are never serialized (-emit-module-interface for an implementation unit is diagnosed and rejected). Differential Revision: https://reviews.llvm.org/D126959
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