On 22 November 2013 14:09, Terry Guo wrote: > But if you search i386.c, you will find many bool type variables. Why > it works for i386.c but not for i386.h? i386.h is a header, it's not only used in one place. I assume your error is because i386.c is compiled as a C++ file, but i386.h is included in a file that is compiled as a C file, e.g. libgcc.c