meson: disable warnings about unused variables for NDEBUG builds

With assertions disabled, we'd get a bunch of warnings that really bring no
value. With this change, a default meson build with -Db_ndebug=true generates
no warnings.

diff --git a/meson.build b/meson.build
index 20bcb9d8b1af04645369c1c7df303aa115e31089..e446fe73702e2af12eff9fedf40b8dd1fe75e87f 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -383,6 +383,16 @@ if get_option('buildtype') != 'debug'
         possible_link_flags += '-Wl,--gc-sections'
 endif
 
+if get_option('b_ndebug') == 'true'
+        # With asserts disabled with get a bunch of warnings about variables which
+        # are used only in the asserts. This is not useful at all, so let's just silence
+        # those warnings.
+        possible_cc_flags += [
+                '-Wno-unused-variable',
+                '-Wno-unused-but-set-variable',
+        ]
+endif
+
 add_project_arguments(cc.get_supported_arguments(possible_cc_flags), language : 'c')
 add_project_link_arguments(cc.get_supported_link_arguments(possible_link_flags), language : 'c')