[cfe-dev] Clang Plugins on Windows

[Andrzej Warzynski via cfe-dev]

Hi Chris,

This patch by Serge Guelton automates integration of static pass plugins:

https://reviews.llvm.org/D61446?id=221321

I'm not sure whether your plugin falls into similar category, but it's
definitely worth having a look.

-Andrzej

On 30/09/2019 14:12, Stephan Bergmann via cfe-dev wrote:
> On 30/09/2019 14:40, Christopher Baish via cfe-dev wrote:
>> I have written a plugin for Clang which does additional type checking
>> around format strings. It is currently running as a plugin on Linux
>> and macOS machines.
>> We are hoping to also run it on our Windows builds, in order to boost
>> our coverage, however I understand that the 'normal' way to use a
>> clang plugin doesn't work on Windows.
>>
>> The plugin currently works via a RecursiveASTVisitor, and then having
>> found an instance of a var-args function call runs the custom type
>> checker.
>>
>> This
>> (https://stackoverflow.com/questions/25657586/how-to-enable-dll-building-for-windows-in-llvm)
>> implies that it would be possible to alter something in the build
>> system to compile in the plugin library statically. This would be
>> ideal for our use case, because we are building clang from source
>> already, and we are only using it with the plugin, never alone.
>> Unfortunately I can't find any information on how to go about
>> statically linking the library into the main executable, or about
>> other ways we could go about getting this working.
>
> We're using such a dynamic library plugin for LibreOffice.  I can't
> remember all the details of how I got it working on Windows, but what
> probably is relevant is building LLVM/Clang with
> -DLLVM_EXPORT_SYMBOLS_FOR_PLUGINS=ON and maybe some of the options we
> pass to cl.exe (aka $(COMPILER_PLUGINS_CXX) in our makefile) when
> linking the plugin DLL at
> <https://opengrok.libreoffice.org/xref/core/compilerplugins/Makefile-clang.mk?r=db123aba#202>.
>   Maybe that helps a bit...
>
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