[PATCH] D28728: [libc++] Introduce _LIBCPP_EXTERN_VIS to fix __libcpp_debug_function link errors

Eric Fiselier via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Sat Jan 14 03:04:53 PST 2017

EricWF created this revision.
EricWF added reviewers: smeenai, compnerd.
EricWF added a subscriber: cfe-commits.

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.



Index: include/__debug
--- include/__debug
+++ include/__debug
@@ -74,7 +74,7 @@
 /// __libcpp_debug_function - The handler function called when a _LIBCPP_ASSERT
 ///    fails.
-extern __libcpp_debug_function_type __libcpp_debug_function;
+extern _LIBCPP_EXTERN_VIS __libcpp_debug_function_type __libcpp_debug_function;
 /// __libcpp_abort_debug_function - A debug handler that aborts when called.
Index: include/__config
--- include/__config
+++ include/__config
@@ -583,6 +583,7 @@
 #define _LIBCPP_TYPE_VIS            _LIBCPP_DLL_VIS
 #define _LIBCPP_FUNC_VIS            _LIBCPP_DLL_VIS
@@ -636,6 +637,10 @@
Index: docs/DesignDocs/VisibilityMacros.rst
--- docs/DesignDocs/VisibilityMacros.rst
+++ docs/DesignDocs/VisibilityMacros.rst
@@ -22,6 +22,12 @@
   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.
+  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.
   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`.

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