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[libc++] Introduce _LIBCPP_EXTERN_VIS to fix __libcpp_debug_function link errors

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Summary: On Windows tests that use `_LIBCPP_ASSERT` fail to link because the assertion handler function isn't correctly exported from the libc++ dylib. This patch fixes the dll import/export issues by introducing a new visibility macro `_LIBCPP_EXTERN_VIS` for use on external variables.

Reviewers: compnerd, smeenai, EricWF

Reviewed By: EricWF

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D28728

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@292158 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2017-01-16 21:01:00 +00:00
parent bde2871b62
commit dae39608bb
3 changed files with 12 additions and 1 deletions
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6
docs/DesignDocs/VisibilityMacros.rst
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@@ -22,6 +22,12 @@ Visibility Macros
Mark a symbol as being exported by the libc++ library. This attribute must
be applied to the declaration of all functions exported by the libc++ dylib.
**_LIBCPP_EXTERN_VIS**
Mark a symbol as being exported by the libc++ library. This attribute may
only be applied to objects defined in the libc++ library. On Windows this
macro applies `dllimport`/`dllexport` to the symbol. On all other platforms
this macro has no effect.
**_LIBCPP_OVERRIDABLE_FUNC_VIS**
Mark a symbol as being exported by the libc++ library, but allow it to be
overridden locally. On non-Windows, this is equivalent to `_LIBCPP_FUNC_VIS`.