Richard Smith 6bc7502385 When making modules transitively visible, don't take into account
whether they have missing header files.

Whether a module's headers happen to be present on the local file system
should make no difference to whether we make its contents visible when
importing another module that re-exports it. If we have an up-to-date
AST file that we can load, that's all that matters.

This fixes the ability to header syntax checking for modular headers in
C++20 mode (or in prior modes where -fmodules-local-submodule-visibility
is enabled but -fmodules is not).
2020-04-17 22:49:58 -07:00

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module M {
module A { header "a.h" export * }
module B { header "b.h" export * }
module X { header "x.h" header "missing.h" export * }
module All { header "all.h" export * }
}