meson: Expose library build type as global variables

Given that it can be computed using an error-prone strings comparisons it
is better to provide a variable everywhere, so that we don't have the
risk of comparing values that are always false.

docs/reference/meson.build

@@ -45,12 +45,12 @@ if get_option('gtk_doc')
   dependency('gtk-doc', version : '>=1.32.1',
     fallback : ['gtk-doc', 'dummy_dep'],
     default_options : ['tests=false'])
-endif
 
-# We cannot built the API reference off of a static library,
-# as symbols might get dropped by the linker
-if get_option('gtk_doc') and get_option('default_library') == 'static'
-  error('The API reference can only be built against a shared library')
+  # We cannot built the API reference off of a static library,
+  # as symbols might get dropped by the linker
+  if not glib_build_shared
+    error('The API reference can only be built against a shared library')
+  endif
 endif
 
 subdir('gio')

gio/meson.build

@@ -601,7 +601,7 @@ gio_sources = files(
   'gliststore.c',
 )
 
-if get_option('default_library') != 'static'
+if glib_build_shared
   gio_sources += files ('../glib/gtrace.c')
 endif
 

gio/tests/gdbus-object-manager-example/meson.build

@@ -39,7 +39,7 @@ gdbus_example_objectmanager_rst_gen = custom_target('objectmanager-rst-gen',
 )
 
 extra_c_args = []
-if get_option('default_library') == 'static'
+if glib_build_static_only
   extra_c_args = '-DGDBUS_OBJECT_MANAGER_EXAMPLE_STATIC_COMPILATION'
 endif
 

gio/tests/meson.build

@@ -223,7 +223,7 @@ if host_machine.system() != 'windows'
   }
 
   # LD_PRELOAD modules don't work so well with AddressSanitizer
-  if have_rtld_next and get_option('default_library') != 'static' and get_option('b_sanitize') == 'none'
+  if have_rtld_next and glib_build_shared and get_option('b_sanitize') == 'none'
     gio_tests += {
       'gsocketclient-slow' : {
         'depends' : [
@@ -652,7 +652,7 @@ if meson.can_run_host_binaries()
 
   compiler_type = '--compiler=@0@'.format(cc.get_id())
 
-  if get_option('default_library') != 'static'
+  if glib_build_shared
     plugin_resources_c = custom_target('plugin-resources.c',
       input : 'test4.gresource.xml',
       output : 'plugin-resources.c',
@@ -983,6 +983,6 @@ endif
 
 subdir('services')
 
-if get_option('default_library') != 'static'
+if glib_build_shared
   subdir('modules')
 endif

glib/meson.build

@@ -348,7 +348,7 @@ glib_sources += files(
 platform_deps = []
 
 if host_system == 'windows'
-  if get_option('default_library') == 'shared'
+  if glib_build_shared
     glib_win_rc = configure_file(
       input: 'glib.rc.in',
       output: 'glib.rc',

glib/tests/meson.build

@@ -205,7 +205,7 @@ else
     'include' : {},
     'unix' : {},
   }
-  if have_rtld_next and get_option('default_library') != 'static'
+  if have_rtld_next and glib_build_shared
     glib_tests += {
       'gutils-user-database' : {
         'depends' : [

gmodule/tests/meson.build

@@ -38,7 +38,7 @@ if ['darwin', 'ios'].contains(host_machine.system())
   module_suffix = 'so'
 endif
 
-if get_option('default_library') != 'static'
+if glib_build_shared
   foreach module : ['moduletestplugin_a', 'moduletestplugin_b']
     shared_module(module + '_plugin', 'lib@0@.c'.format(module),
       dependencies : [libglib_dep, libgmodule_dep],

gobject/meson.build

@@ -62,7 +62,7 @@ gobject_sources += files(
   'gvaluetypes.c',
 )
 
-if host_system == 'windows' and get_option('default_library') == 'shared'
+if host_system == 'windows' and glib_build_shared
   gobject_win_rc = configure_file(
     input: 'gobject.rc.in',
     output: 'gobject.rc',

meson.build

@@ -221,11 +221,27 @@ if host_system == 'windows' and cc.get_id() != 'msvc' and cc.get_id() != 'clang-
   glib_conf.set('_FILE_OFFSET_BITS', 64)
 endif
 
-if get_option('default_library') == 'both' and (host_system == 'windows' or host_system == 'cygwin')
+glib_build_shared = false
+glib_build_static = false
+if get_option('default_library') == 'both'
+  glib_build_static = true
+  glib_build_shared = true
+elif get_option('default_library') == 'static'
+  glib_build_static = true
+elif get_option('default_library') == 'shared'
+  glib_build_shared = true
+endif
+
+glib_build_both = glib_build_static and glib_build_shared
+glib_build_static_only = glib_build_static and not glib_build_shared
+glib_build_shared_only = glib_build_shared and not glib_build_static
+
+if glib_build_shared and glib_build_static and (
+  host_system == 'windows' or host_system == 'cygwin')
   error('On Windows default_library must be "shared" or "static" but not "both"')
 endif
 
-if get_option('default_library') == 'static'
+if glib_build_static_only
   glibconfig_conf.set('GLIB_STATIC_COMPILATION', '1')
   glibconfig_conf.set('GOBJECT_STATIC_COMPILATION', '1')
   glibconfig_conf.set('GIO_STATIC_COMPILATION', '1')