Nick Wellnhofer created CLOWNFISH-53:
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Summary: Support MSVC in C mode
Key: CLOWNFISH-53
URL: https://issues.apache.org/jira/browse/CLOWNFISH-53
Project: Apache Lucy-Clownfish
Issue Type: Improvement
Components: Core
Reporter: Nick Wellnhofer
Priority: Minor
MSVC 12 which is part of Visual Studio 2013 has greatly improved support for
C99. This makes it possible to build Clownfish projects in normal C mode as
opposed to C++ mode which we traditionally used. I already switched to C mode
for the Clownfish compiler and runtime.
But there's a problem with projects linking to the Clownfish DLL. [As explained
here|https://msdn.microsoft.com/en-us/library/twa2aw10.aspx], it's not possible
to use the address of a global variable imported from a DLL via
{{__declspec(dllimport)}} in a global initializer. This is only a problem for C
code. C++ has much fewer restrictions regarding global initializers. We
currently need this feature for the {{parent}} and {{parent_offset}} fields in
the class and method spec structs.
I already hit the same problem with MinGW. I was able to circumvent it by
simply omitting {{__declspec(dllimport)}}. Further investigation showed that
this works because of the {{--enable-auto-import}} feature of MinGW's linker.
Unfortunately, this is a GNU-only extension.
I can think of a couple of different solutions.
* Define all spec structs as local variables in a function.
* Initialize the problematic fields in a function.
* Lookup parent classes and parent method offsets by name.
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