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https://issues.apache.org/jira/browse/LUCY-215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235876#comment-13235876
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Nick Wellnhofer commented on LUCY-215:
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I created a new branch LUCY-215-cf-extensions. As a first step, I added support
for multiple source directories to Clownfish.
> Support extensions written in C
> -------------------------------
>
> Key: LUCY-215
> URL: https://issues.apache.org/jira/browse/LUCY-215
> Project: Lucy
> Issue Type: New Feature
> Components: Clownfish
> Reporter: Nick Wellnhofer
> Assignee: Nick Wellnhofer
>
> Currently, all Lucy extensions that contain C code must be shipped with the
> Lucy source tree. In order to support external C-based extensions, Clownfish
> must be able to compile .cfh files that extend classes from a separate source
> tree. As discussed on the mailing list, a solution could look like this:
> * Install the .cfh files together with Lucy.
> * When building the extension, rebuild the complete Clownfish hierarchy
> together with the new classes.
> * Generate C headers, regenerating the headers for Lucy's core classes.
> * Compile the extension.
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