Merge branch 'wip/pwithnall/macos-werror' into 'main'

gutils: Disable some dead code on macOS

See merge request GNOME/glib!2345

.gitlab-ci.yml

@@ -436,7 +436,6 @@ macos:
     - pip3 install --user ninja
     - export PATH=/Users/gitlabrunner/Library/Python/3.7/bin:$PATH
   script:
-    # FIXME: Add --werror
     # FIXME: Use --wrap-mode=default so we download dependencies each time,
     # until the macOS runner is a VM where we can use a pre-made image which
     # already contains the dependencies. See:
@@ -444,6 +443,7 @@ macos:
     #  - https://gitlab.gnome.org/Infrastructure/Infrastructure/issues/225
     - meson ${MESON_COMMON_OPTIONS}
             --wrap-mode=default
+            --werror
             _build
     - ninja -C _build
     # FIXME: Multiple unit tests currently fails

glib/gosxutils.m

@@ -21,6 +21,8 @@
 #include "gutils.h"
 #include "gstrfuncs.h"
 
+void load_user_special_dirs_macos (gchar **table);
+
 static gchar *
 find_folder (NSSearchPathDirectory type)
 {

glib/gutils.c

@@ -1368,7 +1368,7 @@ get_windows_version (gboolean with_windows)
 }
 #endif
 
-#ifdef G_OS_UNIX
+#if defined (G_OS_UNIX) && !defined (__APPLE__)
 static gchar *
 get_os_info_from_os_release (const gchar *key_name,
                              const gchar *buffer)
@@ -1497,7 +1497,7 @@ get_os_info_from_uname (const gchar *key_name)
   else
     return NULL;
 }
-#endif
+#endif  /* defined (G_OS_UNIX) && !defined (__APPLE__) */
 
 /**
  * g_get_os_info:

glib/tests/utils.c

@@ -553,7 +553,7 @@ test_os_info (void)
 {
   gchar *name;
   gchar *contents = NULL;
-#ifdef G_OS_UNIX
+#if defined (G_OS_UNIX) && !(defined (G_OS_WIN32) || defined (__APPLE__))
   struct utsname info;
 #endif
 

meson.build

@@ -425,31 +425,40 @@ endforeach
 
 # Compiler flags
 if cc.get_id() == 'gcc' or cc.get_id() == 'clang'
-  warning_c_args = [
+  warning_common_args = [
     '-Wduplicated-branches',
     '-Wimplicit-fallthrough',
     '-Wmisleading-indentation',
-    '-Wstrict-prototypes',
     '-Wunused',
     # Due to maintained deprecated code, we do not want to see unused parameters
     '-Wno-unused-parameter',
     # Due to pervasive use of things like GPOINTER_TO_UINT(), we do not support
     # building with -Wbad-function-cast.
-    '-Wno-bad-function-cast',
     '-Wno-cast-function-type',
     # Due to function casts through (void*) we cannot support -Wpedantic:
     # https://wiki.gnome.org/Projects/GLib/CompilerRequirements#Function_pointer_conversions.
     '-Wno-pedantic',
     # A zero-length format string shouldn't be considered an issue.
     '-Wno-format-zero-length',
-    '-Werror=declaration-after-statement',
+    # We explicitly require variadic macros
+    '-Wno-variadic-macros',
     '-Werror=format=2',
-    '-Werror=implicit-function-declaration',
     '-Werror=init-self',
     '-Werror=missing-include-dirs',
-    '-Werror=missing-prototypes',
     '-Werror=pointer-arith',
   ]
+
+  warning_c_args = warning_common_args + [
+    '-Wstrict-prototypes',
+    # Due to pervasive use of things like GPOINTER_TO_UINT(), we do not support
+    # building with -Wbad-function-cast.
+    '-Wno-bad-function-cast',
+    '-Werror=declaration-after-statement',
+    '-Werror=implicit-function-declaration',
+    '-Werror=missing-prototypes',
+  ]
+  warning_cxx_args = warning_common_args
+  warning_objc_args = warning_c_args
   warning_c_link_args = [
     '-Wl,-z,nodelete',
   ]
@@ -458,10 +467,13 @@ if cc.get_id() == 'gcc' or cc.get_id() == 'clang'
   endif
 else
   warning_c_args = []
+  warning_cxx_args = []
+  warning_objc_args = []
   warning_c_link_args = []
 endif
 
 add_project_arguments(cc.get_supported_arguments(warning_c_args), language: 'c')
+add_project_arguments(cxx.get_supported_arguments(warning_cxx_args), language: 'cpp')
 
 # FIXME: We cannot build some of the GResource tests with -z nodelete, which
 # means we cannot use that flag in add_project_link_arguments(), and must add
@@ -755,6 +767,8 @@ if host_system == 'darwin'
   add_languages('objc')
   objcc = meson.get_compiler('objc')
 
+  add_project_arguments(objcc.get_supported_arguments(warning_objc_args), language: 'objc')
+
   osx_ldflags += ['-Wl,-framework,CoreFoundation']
 
   # Mac OS X Carbon support