I had a talk with Lang about the ExecutionEngine library structuring, and it
sounds like there are some problems there that need to be worked out.
Luckily for this specific case, I think the solution is actually quite simple:
```
diff --git a/include/llvm/ExecutionEngine/ExecutionEngine.h
b/include/llvm/ExecutionEngine/ExecutionEngine.h
index f68337c..cc99f94 100644
--- a/include/llvm/ExecutionEngine/ExecutionEngine.h
+++ b/include/llvm/ExecutionEngine/ExecutionEngine.h
@@ -15,7 +15,6 @@
#ifndef LLVM_EXECUTIONENGINE_EXECUTIONENGINE_H
#define LLVM_EXECUTIONENGINE_EXECUTIONENGINE_H
-#include "RuntimeDyld.h"
#include "llvm-c/ExecutionEngine.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
@@ -49,6 +48,7 @@ class ObjectCache;
class RTDyldMemoryManager;
class Triple;
class Type;
+class JITSymbolResolver;
namespace object {
class Archive;
```
It seems to me that there is no reason why ExecutionEngine.h needs to include
RuntimeDyld.h. a forward declaration of the JITSymbolResolver class will
suffice.
-Chris
> On Mar 30, 2017, at 11:41 AM, Michał Górny via Phabricator
> <revi...@reviews.llvm.org> wrote:
>
> mgorny added a comment.
>
> In https://reviews.llvm.org/D31367#714305, @beanz wrote:
>
>> Please revert your patch. It is *not* the right solution and is masking
>> underlying problems.
>
>
> Reverted in r299095. Now I'd really appreciate some help in figuring out how
> to fix it properly.
>
>> ExecutionEngine headers directly reference symbols from RuntimeDyld, so we
>> should enforce a requirement that anyone using ExeuctionEngine also link
>> RuntimeDyld. This works today as expected for static archive builds. It is
>> only broken with `BUILD_SHARED_LIBS`. I suspect the problem is that when
>> built as a DSO ExecutionEngine has no unresolved symbols against
>> RuntimeDyld, and the linker probably isn't including the reference to
>> RuntimeDyld in the produced ExecutionEngine DSO.
>
> The DSO is linking to RuntimeDyld. However, obviously the `PRIVATE` linkage
> forced in `llvm_add_library` is not the correct solution when the symbols are
> explicitly used in the headers. It should be `PUBLIC` for that particular
> component. Any suggestion on how to fix that API? Should I add an additional
> `PUBLIC_LINK_COMPONENTS` (and `PUBLIC_LINK_LIBS`)?
>
>
> Repository:
> rL LLVM
>
> https://reviews.llvm.org/D31367
>
>
>
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