branches/zip: Enclose some #error checks inside #ifndef DOXYGEN

to prevent bogus Doxygen errors.

fsp/fsp0fsp.c

@@ -647,14 +647,16 @@ xdes_calc_descriptor_page(
 				0 for uncompressed pages */
 	ulint	offset)		/*!< in: page offset */
 {
-#if UNIV_PAGE_SIZE <= XDES_ARR_OFFSET \
+#ifndef DOXYGEN /* Doxygen gets confused of these */
+# if UNIV_PAGE_SIZE <= XDES_ARR_OFFSET \
 		+ (UNIV_PAGE_SIZE / FSP_EXTENT_SIZE) * XDES_SIZE
-# error
-#endif
-#if PAGE_ZIP_MIN_SIZE <= XDES_ARR_OFFSET \
+#  error
+# endif
+# if PAGE_ZIP_MIN_SIZE <= XDES_ARR_OFFSET \
 		+ (PAGE_ZIP_MIN_SIZE / FSP_EXTENT_SIZE) * XDES_SIZE
-# error
-#endif
+#  error
+# endif
+#endif /* !DOXYGEN */
 	ut_ad(ut_is_2pow(zip_size));
 
 	if (!zip_size) {