[smart_holder] Remove `-fvisibility-hidden` experiment#4069

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rwgk wants to merge 9 commits intopybind:archive/smart_holderfrom

rwgk:sh_no_fvisibility_hidden

Commits on Jul 15, 2022

Commits on Jul 16, 2022

Introduce `PYBIND11_NS_VISIBILITY(...)` macro, use to fix "declared with greater visibility" warnings.
rwgk
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Completely remove coded previously only commented out under commit e0c3750ed6aff6642ee01ef9556cfff9f66ac665
rwgk
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Fix silly mistake.
rwgk
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Add more `PYBIND11_NS_VISIBILITY` for `trampoline_self_life_support`
rwgk
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Add more `PYBIND11_NS_VISIBILITY` to resolve CUDA and mingw warnings.
rwgk
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Rename test_exc_namespace_visibility.py back to test_namespace_visibility.py
rwgk
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Revert "Rename test_exc_namespace_visibility.py back to test_namespace_visibility.py"
rwgk
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