cast: fix warnings with -Wextra (specifically -Wmissing-field-initializers)

[ccan] / ccan / cast / cast.h

diff --git a/ccan/cast/cast.h b/ccan/cast/cast.h
index 9f3ecdb7179e78ae9fdea84e801252b989d5f540..b108b0c864d3b0cd07e26a497040537921d674b4 100644 (file)
--- a/ccan/cast/cast.h
+++ b/ccan/cast/cast.h
@@ -106,11 +106,11 @@
          )
 
 #define cast_const_strip1(expr)                        \
-       __typeof__(*(struct { int z; __typeof__(expr) x; }){0}.x)
+       __typeof__(*(union { int z; __typeof__(expr) x; }){0}.x)
 #define cast_const_strip2(expr) \
-       __typeof__(**(struct { int z; __typeof__(expr) x; }){0}.x)
+       __typeof__(**(union { int z; __typeof__(expr) x; }){0}.x)
 #define cast_const_strip3(expr) \
-       __typeof__(***(struct { int z; __typeof__(expr) x; }){0}.x)
+       __typeof__(***(union { int z; __typeof__(expr) x; }){0}.x)
 #define cast_const_compat1(expr, type)                                 \
        __builtin_types_compatible_p(cast_const_strip1(expr),           \
                                     cast_const_strip1(type))