- struct verify_type__ { unsigned int verify_error_if_negative_size__: w; };
-# define verify_true(R) \
- (!!sizeof (verify_type__<(R) ? 1 : -1>))
+ struct _gl_verify_type {
+ unsigned int _gl_verify_error_if_negative: w;
+ };
+# define GNULIB_defined_struct__gl_verify_type 1
+# endif
+# define _GL_VERIFY_TYPE(R, DIAGNOSTIC) \
+ _gl_verify_type<(R) ? 1 : -1>
+# elif defined _GL_HAVE__STATIC_ASSERT
+# define _GL_VERIFY_TYPE(R, DIAGNOSTIC) \
+ struct { \
+ _Static_assert (R, DIAGNOSTIC); \
+ int _gl_dummy; \
+ }
+# else
+# define _GL_VERIFY_TYPE(R, DIAGNOSTIC) \
+ struct { unsigned int _gl_verify_error_if_negative: (R) ? 1 : -1; }
+# endif
+
+/* Verify requirement R at compile-time, as a declaration without a
+ trailing ';'. If R is false, fail at compile-time, preferably
+ with a diagnostic that includes the string-literal DIAGNOSTIC.
+
+ Unfortunately, unlike C11, this implementation must appear as an
+ ordinary declaration, and cannot appear inside struct { ... }. */
+
+# ifdef _GL_HAVE__STATIC_ASSERT
+# define _GL_VERIFY _Static_assert