[glib/wip/pwithnall/macos-werror] build: Disable -Wvariadic-macros

[Philip Withnall <pwithnall src gnome org>]

commit f87c36c7b67f6c69f516a00d89899985a6e6a66a
Author: Philip Withnall <pwithnall endlessos org>
Date:   Thu Nov 18 11:58:18 2021 +0000

    build: Disable -Wvariadic-macros
    
    We explicitly require support for variadic macros; see
    https://wiki.gnome.org/Projects/GLib/CompilerRequirements.
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 meson.build | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/meson.build b/meson.build
index ef75306c2..60a58de47 100644
--- a/meson.build
+++ b/meson.build
@@ -442,6 +442,8 @@ if cc.get_id() == 'gcc' or cc.get_id() == 'clang'
     '-Wno-pedantic',
     # A zero-length format string shouldn't be considered an issue.
     '-Wno-format-zero-length',
+    # We explicitly require variadic macros
+    '-Wno-variadic-macros',
     '-Werror=declaration-after-statement',
     '-Werror=format=2',
     '-Werror=implicit-function-declaration',
@@ -462,6 +464,7 @@ else
 endif
 
 add_project_arguments(cc.get_supported_arguments(warning_c_args), language: 'c')
+add_project_arguments(cxx.get_supported_arguments(warning_c_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