Thanks for the tip
As I had already a CXXFLAGS="-fno-keep-inline-dllexport" (as suggested by TDM), I have simply replaced it by CXXFLAGS="-fno-keep-inline-dllexport -fpermissive"
Wx 2.8.12 compiles now in 64 bits and I have been able to compile C::B (svn 9571) with it in 64 bits too.
It seems to work !!!
- no problems with spellchecker nor with FortranProject plugin apparently.
- No messages about wxDebug alert, even on a release version of Wx 2.8.12.
Of course, it needs more testing than just trying to work with this C::B 64 bits version during a few minutes, but ...
gd_on