[gnome-photos/wip/rishi/buffer-decoder: 5/15] build: Split some code into a private shared library

[Debarshi Ray <debarshir src gnome org>]

commit 8fb059b66b02653702add48290753794bdae621a
Author: Debarshi Ray <debarshir gnome org>
Date:   Tue Sep 25 09:21:23 2018 +0200

    build: Split some code into a private shared library
    
    The overall idea is to start adding unit tests, wherever possible.
    Putting the tested code in a private library makes it accessible from
    test cases because they can link to it.
    
    Subsequent commits will add a new codec API for GeglBuffer. It will be
    very important to have unit tests for those code paths because:
      * That code will be inherently testable and tests are great.
      * That code is likely to be security sensitive, will handle all
        sorts of dodgy input from untrusted sources, and written using
        very old APIs with brittle error handling.
    
    This is a step towards that.
    
    A private shared library seems better than a private static archive
    because the most easily testable code paths are shared across the main
    application and the thumbnailer. Therefore, the assumption is that the
    benefits of sharing that code across both processes outweigh the
    drawbacks of having to resolve yet another shared library on startup.
    However, this is just an assumption. There's no data behind it.
    
    https://gitlab.gnome.org/GNOME/gnome-photos/issues/63

 meson.build     |  1 +
 src/meson.build | 25 ++++++++++++++++++++++++-
 2 files changed, 25 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e9040dba..ffba85eb 100644
--- a/meson.build
+++ b/meson.build
@@ -13,6 +13,7 @@ photos_libexecdir = join_paths(photos_prefix, get_option('libexecdir'))
 photos_localedir = join_paths(photos_prefix, get_option('localedir'))
 
 photos_docdir = join_paths(photos_datadir, 'doc', meson.project_name())
+photos_libdir = join_paths(photos_prefix, get_option('libdir'), meson.project_name())
 
 photos_installed_test_metadir = join_paths(photos_datadir, 'installed-tests', meson.project_name())
 photos_installed_test_execdir = join_paths(photos_libexecdir, 'installed-tests', meson.project_name())
diff --git a/src/meson.build b/src/meson.build
index 88dfc4ba..40843751 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -1,3 +1,24 @@
+sources = files(
+  'photos-quarks.c',
+)
+
+deps = [
+  glib_dep,
+]
+
+libgnome_photos = shared_library(
+  meson.project_name(),
+  sources,
+  dependencies: deps,
+  include_directories: top_inc,
+  install: true,
+  install_dir: photos_libdir,
+)
+
+libgnome_photos_dep = declare_dependency(
+  link_with: libgnome_photos,
+)
+
 common_sources = files(
   'photos-debug.c',
   'photos-error.c',
@@ -15,7 +36,6 @@ common_sources = files(
   'photos-operation-svg-multiply.c',
   'photos-pipeline.c',
   'photos-png-count.c',
-  'photos-quarks.c',
 )
 
 enum_headers = files(
@@ -68,6 +88,7 @@ common_deps = [
   glib_dep,
   goa_dep,
   libdazzle_dep,
+  libgnome_photos_dep,
   libjpeg_dep,
   libpng_dep,
   m_dep,
@@ -363,6 +384,7 @@ executable(
   c_args: cflags,
   install: true,
   install_dir: photos_bindir,
+  install_rpath: photos_libdir,
 )
 
 sources = common_sources + files(
@@ -379,4 +401,5 @@ executable(
   c_args: cflags,
   install: true,
   install_dir: photos_libexecdir,
+  install_rpath: photos_libdir,
 )