Windows: Add -dllimport CLI option for more selective implicit dllimports #3763
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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.
kinke
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With this proposal, the option of only dllimporting (~all external D globals) without own dllexports (previous Until now, I've tried to handle these implicit dllimports without extra cmdline option, to keep things reasonably simple. Maybe an explicit option is better; having to use |
kinke
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I've tested this for an executable with ~150 dub dependencies (incl. big ones like vibe-d; all static libs), wanting to link it against shared druntime/Phobos - by enforcing This led to 21 undefined symbols; some TLS variables ( |
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After some fixes, down to 1 undefined symbol (ModuleInfo) - there are 3rd-party packages in |
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No more linker errors, but hitting #3690 apparently. |
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-link-defaultlib-sharedfor implicit dllimport.E.g., this enables to compile druntime DLL with
-fvisibility=publicfor pure exports and no (local) imports (such as builtin TypeInfos).-link-defaultlib-sharedalone 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=publicanymore (if the DLL itself isn't either),-link-defaultlib-sharedis 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.