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[api][visibility] Make the visibility macros more consistent

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1. Follow the scheme introduced in PR #2501 for both `zdict.h` and `zstd_errors.h`.
2. If the `*_VISIBLE` macro isn't set, but the `*_VISIBILITY` macro is, use that.
   Also make this change for `zstd.h`, since we probably shouldn't have changed
   that macro name without backward compatibility in the first place.
3. Change all references to `*_VISIBILITY` to `*_VISIBLE`.

Fixes #3359.
This commit is contained in:
Nick Terrell
2022-12-16 12:54:45 -08:00
committed by Nick Terrell
parent 58508398f4
commit 358a237484
6 changed files with 95 additions and 32 deletions
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lib/README.md
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@@ -161,6 +161,13 @@ The file structure is designed to make this selection manually achievable for an
`ZSTD_DCtx` decompression contexts,
but might also result in a small decompression speed cost.
- The C compiler macros `ZSTDLIB_VISIBLE`, `ZSTDERRORLIB_VISIBLE` and `ZDICTLIB_VISIBLE`
can be overridden to control the visibility of zstd's API. Additionally,
`ZSTDLIB_STATIC_API` and `ZDICTLIB_STATIC_API` can be overridden to control the visibility
of zstd's static API. Specifically, it can be set to `ZSTDLIB_HIDDEN` to hide the symbols
from the shared library. These macros default to `ZSTDLIB_VISIBILITY`,
`ZSTDERRORLIB_VSIBILITY`, and `ZDICTLIB_VISIBILITY` if unset, for backwards compatibility
with the old macro names.
#### Windows : using MinGW+MSYS to create DLL