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[Windows] Fix dllimport issue in unit tests #35246
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loic-sharma
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Aug 8, 2022
In flutter#35106, I landed a parameter type fix for the declaration of FlutterDesktopEngineGetTextureRegistrar in our public Windows C API. I also added a unit test that called this function. That function (and all others) in our public Windows API is marked FLUTTER_EXPORT, which resolves to __declspec(dllexport) or __declspec(dllimport) depending on whether FLUTTER_DESKTOP_LIBRARY is defined. It can be defined by adding the following build config: //flutter/shell/platform/common:desktop_library_implementation If the function is marked as an import, we get linker warnings that we're importing a function that's defined in the same executable image. This patch resolves this by marking the functions as export. An alternative fix would be to support a third macro resolution that resolves to nothing in the presence of some definition like FLUTTER_NO_EXPORT; however, since flutter_export.h is a public header, I'd prefer not to complicate it further. See: https://github.com/flutter/engine/blob/main/shell/platform/common/public/flutter_export.h See: https://github.com/flutter/engine/blob/a51c7638e702b086dffaae3ce92f52130a2c23ff/shell/platform/common/BUILD.gn#L8-L10
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In flutter#35106, I landed a parameter type fix for the declaration of FlutterDesktopEngineGetTextureRegistrar in our public Windows C API. I also added a unit test that called this function. That function (and all others) in our public Windows API is marked FLUTTER_EXPORT, which resolves to __declspec(dllexport) or __declspec(dllimport) depending on whether FLUTTER_DESKTOP_LIBRARY is defined. It can be defined by adding the following build config: //flutter/shell/platform/common:desktop_library_implementation If the function is marked as an import, we get linker warnings that we're importing a function that's defined in the same executable image. This patch resolves this by marking the functions as export. An alternative fix would be to support a third macro resolution that resolves to nothing in the presence of some definition like FLUTTER_NO_EXPORT; however, since flutter_export.h is a public header, I'd prefer not to complicate it further, and this is a unit test that can't be linked against either way. Issue: flutter/flutter#109184 Original issue: flutter/flutter#86617 See: https://github.com/flutter/engine/blob/main/shell/platform/common/public/flutter_export.h See: https://github.com/flutter/engine/blob/a51c7638e702b086dffaae3ce92f52130a2c23ff/shell/platform/common/BUILD.gn#L8-L10 No new tests since this simply fixes a link warning message in unit tests.
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In #35106, I landed a parameter type fix for the
declaration of FlutterDesktopEngineGetTextureRegistrar in our public
Windows C API. I also added a unit test that called this function.
That function (and all others) in our public Windows API is marked
FLUTTER_EXPORT, which resolves to __declspec(dllexport) or
__declspec(dllimport) depending on whether FLUTTER_DESKTOP_LIBRARY is
defined. It can be defined by adding the following build config:
//flutter/shell/platform/common:desktop_library_implementation
If the function is marked as an import, we get linker warnings that
we're importing a function that's defined in the same executable image.
This patch resolves this by marking the functions as export.
An alternative fix would be to support a third macro resolution that
resolves to nothing in the presence of some definition like
FLUTTER_NO_EXPORT; however, since flutter_export.h is a public header,
I'd prefer not to complicate it further, and this is a unit test that
can't be linked against either way.
Issue: flutter/flutter#109184
Original issue: flutter/flutter#86617
See: https://github.com/flutter/engine/blob/main/shell/platform/common/public/flutter_export.h
See:
engine/shell/platform/common/BUILD.gn
Lines 8 to 10 in a51c763
No new tests since this simply fixes a link warning message in unit tests.
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