Sterling-Augustine wrote:
This may be relevant to the fact that these are Clang modules, not C++ 20
modules. Not sure.
We are seeing some issues with this change. Where things built fine before, we
now have the problem below.
header_b.h:
```
#include "header_a.h" // Declares namespace_a, and various things inside it.
namespace namespace_b = namespace_a;
```
and the error is:
```
<header_b.h>:13:34: error: declaration of 'namespace_a' must be imported from
module 'module_c' before it is required
13 | namespace namespace_b = ::<namespace_a>;
| ^
1 error generated.
```
Module_c declares more things in namespace_a, as do many other modules.
I'm working on a reduction, but there are thousands of files involved.
https://github.com/llvm/llvm-project/pull/171769
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