Commit 9968502d authored by Committed by Ben Gamari
Make list of deprecated symbols on Windows weak.
We have a unfortunate workaround in place for the fact that most packages out there use POSIX names for symbols even on Windows. This means that we have to recognize e.g. both `_ungetch` and `ungetch`. The former is the actual symbol name on windows and the latter is the POSIX variant. The problem is that on normal windows programs `ungetch` should not be in the global namespace. To work around this, we now mark the deprecated symbols as weak symbols in the global namespace. This provides the flexibility we need: * If you use the symbol without defining it, we assume you meant to use the POSIX variant. * If you actually define the symbol, we'll hence forth use that definition and assume you didn't mean to use POSIX code. This is how MingW64's wrapper also works. This requires D3028. Fixes #13210. Test Plan: ./validate Reviewers: austin, bgamari, erikd, simonmar Reviewed By: bgamari Subscribers: thomie, #ghc_windows_task_force Differential Revision: https://phabricator.haskell.org/D3154
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