X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=book_make.cpp;h=1b8fe6c90cd198f73417ba6dc3d103c8c6753c38;hb=5eed4adb3552562329c0b0b460c8851efb1a38bb;hp=ba02f512baa9357408530a0c55b0f3e6fb319e4d;hpb=ad2265d4fc54fc9ba99fc606e6174df34bfb4a0f;p=polyglot.git

diff --git a/book_make.cpp b/book_make.cpp
index ba02f51..1b8fe6c 100644
--- a/book_make.cpp
+++ b/book_make.cpp
@@ -35,16 +35,22 @@ struct entry_t {
     uint64 key;
     uint16 move;
     uint16 count;
-    union{   // unfortunately minggw32 seems to have a bug with anon unions.
-        struct { 
+// Unfortunately the minggw32 cross compiler [4.2.1-sjlj (mingw32-2)] 
+// seems to have a bug with anon structs contained in unions when using -O2.
+// See the ASSERT below in "read_entry_file"...
+// To be fair this seems to be illegal in C++
+// although it is hard to understand why, and the compiler does not complain
+// even with -Wall.
+//    union {   
+//        struct { 
             uint16 n;
             uint16 sum;
-        };
-        struct{
+//        };
+//        struct {
             uint8 height;
             int line;
-        };
-    };
+//        };
+        //   };
     uint8 colour;
 };