[llvm-bugs] [Bug 47720] New: #pragma GCC visibility push (default) doesn't work with import

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47720

            Bug ID: 47720
           Summary: #pragma GCC visibility push (default) doesn't work
                    with import
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david at doublewise.net
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

The following translation unit

```
#pragma GCC visibility push (default)

import <utility>;
```

When compiled with `-std=c++20 -stdlib=libc++ -fmodules` generates the
following error

```
x86-64 clang (trunk)
1
x86-64 clang (trunk)
- 596ms

<source>:3:8: error: expected a module name after 'import'

import <utility>;

       ^

1 error generated.

Compiler returned: 1
```

Adding in a corresponding `pop` does not resolve the issue. This occurs in
Boost.Asio headers, which means code using Boost.Asio cannot use modules.

See it live: https://godbolt.org/z/jMf89a

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