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Author SHA1 Message Date
Chuanqi Xu 9c04851cf5 [C++20] [Module] Support reachable definition initially/partially 
This patch introduces a new kind of ModuleOwnershipKind as
ReachableWhenImported. This intended the status for reachable described
at: https://eel.is/c++draft/module.reach#3.

Note that this patch is not intended to support all semantics about
reachable semantics. For example, this patch didn't implement discarded
declarations in GMF. (https://eel.is/c++draft/module.global.frag#3).

This fixes: https://bugs.llvm.org/show_bug.cgi?id=52281 and
https://godbolt.org/z/81f3ocjfW.

Reviewed By: rsmith, iains

Differential Revision: https://reviews.llvm.org/D113545
 2022-06-29 12:48:48 +08:00
Chuanqi Xu 7a541406b5 Revert "[C++20] [Modules] Implement Reachable initiallly" 
This reverts commit a223ba0a69.

The previous commit don't contain additional information, which is bad.
 2022-06-29 12:43:26 +08:00
Chuanqi Xu a223ba0a69 [C++20] [Modules] Implement Reachable initiallly 2022-06-29 12:32:31 +08:00
Richard Smith 0a088ead85 Improve diagnostics for missing import / #include of module. 
Fix a few bugs where we would fail to properly determine header to
module correspondence when determining whether to suggest a #include or
import, and suggest a #include more often in language modes where there
is no import syntax. Generally, if the target is in a header with
include guards or #pragma once, we should suggest either #including or
importing that header, and not importing a module that happens to
textually include it.

In passing, improve the notes we attach to the corresponding
diagnostics: calling an entity that we couldn't see "previous" is
confusing.
 2020-04-28 18:41:14 -07:00
Richard Smith e867e98314 [c++2a] Improve diagnostic for use of declaration from another TU's 
global module fragment.

We know that the declaration in question should have been introduced by
a '#include', so try to figure out which one and suggest it. Don't
suggest importing the global module fragment itself!

llvm-svn: 358631
 2019-04-18 00:56:58 +00:00