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Windows: Make implicit dllimport more selective

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* Newly require `-link-defaultlib-shared` for implicit dllimport.
  E.g., this enables to compile druntime DLL with `-fvisibility=public`
  for pure exports and no (local) imports (such as builtin TypeInfos).
* `-link-defaultlib-shared` alone now only implicitly imports symbols
  from druntime/Phobos.
  This simplifies building complex DLLs linked against a bunch of
  static libs (dub only supports static lib dependencies!); the static
  libs don't need to be compiled with `-fvisibility=public` anymore
  (if the DLL itself isn't either), `-link-defaultlib-shared` is
  sufficient.
  This is mainly useful for existing DLLs with explicit exports, to make
  them link against *shared* druntime/Phobos and so end up with a single
  druntime/Phobos for the whole process.
This commit is contained in:
Martin Kinkelin 2021-06-14 15:27:34 +02:00
parent 2f0ece3274
commit 9865e459d1
15 changed files with 73 additions and 23 deletions
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5
gen/modules.cpp
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@ -190,8 +190,9 @@ LLFunction *build_module_reference_and_ctor(const char *moduleMangle,
LLConstant *mref = gIR->module.getNamedGlobal(mrefIRMangle);
LLType *modulerefPtrTy = getPtrToType(modulerefTy);
if (!mref) {
mref = declareGlobal(Loc(), gIR->module, modulerefPtrTy, mrefIRMangle,
false, false, global.params.dllimport);
mref =
declareGlobal(Loc(), gIR->module, modulerefPtrTy, mrefIRMangle, false,
false, global.params.dllimport != DLLImport::none);
}
mref = DtoBitCast(mref, getPtrToType(modulerefPtrTy));