girepository: Exclude private symbols from the ABI

This removes the gthash utility functions from the ABI, so link those
into their automated test statically.

Signed-off-by: Simon McVittie <smcv@collabora.com>

girepository/cmph/meson.build

@@ -51,6 +51,7 @@ cmph = static_library('cmph',
   sources: cmph_sources,
   c_args: custom_c_args,
   dependencies: cmph_deps,
+  gnu_symbol_visibility : 'hidden',
 )
 
 cmph_dep = declare_dependency(

girepository/meson.build

@@ -106,6 +106,7 @@ girepo_gthash_lib = static_library('girepository-gthash',
     libgmodule_dep,
     libgobject_dep,
   ],
+  gnu_symbol_visibility : 'hidden',
 )
 
 girepo_gthash_dep = declare_dependency(
@@ -132,6 +133,7 @@ libgirepository_internals = static_library('girepository-internals',
     gi_visibility_h,
   ],
   c_args: gir_c_args + custom_c_args,
+  gnu_symbol_visibility : 'hidden',
   include_directories : [configinc, girepoinc],
   dependencies: [girepo_gthash_dep, libffi_dep],
 )

girepository/tests/meson.build

@@ -6,7 +6,9 @@ if enable_gir
     'cmph-bdz': {
       'dependencies': [cmph_dep],
     },
-    'gthash' : {},
+    'gthash' : {
+      'dependencies': [girepo_gthash_dep],
+    },
     'repository' : {
       'depends': [glib_gir, gobject_gir],
     },