I found the mistake: the C::B guide says:
To compile wxWidgets in 64-bit mode add CFG=64 to the build line that is given next or use a compiler that defaults to 64 bit output. For example, MinGW-w64 has toolchains targetting 32 bits and others targetting 64 bits.
So, I pass the argument CFG=64 in command line... now I try to recompile WwWidgets without this option and it seems work properly: codeblocks release is still compiling without any error, for now.
EDIT:
||=== Build finished: 0 error(s), 4 warning(s) (7 minute(s), 40 second(s)) ===|