[Bug 760765] New: build-tools/vala-m4 recipe prevents from using any libraries that ship .vapi files

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760765

            Bug ID: 760765
           Summary: build-tools/vala-m4 recipe prevents from using any
                    libraries that ship .vapi files
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: cerbero
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: marcin at saepia.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

recipes/build-tools/vala-m4.recipe contains the following install routines:

    def install(self):
        shutil.copyfile(os.path.join(self.build_dir, 'vapigen', 'vapigen.m4'),
                        os.path.join(self.config.install_dir, 'share',
                                     'aclocal', 'vala.m4'))
        shutil.copy(os.path.join(self.build_dir, 'vapigen',
'Makefile.vapigen'),
                    os.path.join(self.config.install_dir, 'share', 'vala'))


the last line effectively prevents from using any libraries that ship .vapi
files.

I wanted to add a library that ships its .vapi during make install stage to
standard directory: PREFIX/share/vala/vapi/libraryname.vapi

It fails while using cerbero if vala-m4 recipe was resolved as a dependency
because PREFIX/share/vala is not a directory (it's a file) so it fails to
create PREFIX/share/vala/vapi/ subdirectory.

I cannot understand rationale of copying Makefile.vapigen to PREFIX/share/vala
(it looks like something really non-standard to me) so I can't suggest any
resolution.

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