Extensions support #66
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* Add `load_module` function that dynamically opens shared object and calls special `schaufel_module_init` func; * Create `contrib` directory for modules and a Makefile to build modules in the directory; * Extracted postgres module to `contrib` directory and added a Makefile to build it as a shared library.
… that print include path and library path and make use of those to build contribs and extensions
autogenerated headers and update .gitignore
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Add support for extensions implemented as shared libraries. External modules must implement the interface provided by
modules.hand register themselves withregister_module()function. A single library can register multiple modules.Some of existing modules (those that depend on other libraries) were moved to
contribdirectory and were provided with its own Makefiles. Contrib modules and extensions should includecontrib.mkwhich incorporates all necessary targets for building and installing modules.Top level
Makefilehas been splitted into to parts:Makefileitself andMakefile.global. The latter contains common variables useful for bothMakefileandcontrib.mk. After installation theMakefile.globalandcontrib.mkfile are located inschaufel's libraries path.Added
-L(library path) and-I(include path) options toschaufelexecutable. Those are needed bycontrib.mkto provide correct include path to a compiler and to install modules.Also
autoconfscript has been added. It checks for compiler options, shared libraries needed byschaufelto build, generates makefiles andbuild.hheader file.