Parmenides <mobile.parmenides@xxxxxxxxx> writes: > The gcc implements the stdarg.h to support variable parameters > functions. I wonder how it work. So, I find the stdarg.h at > > > /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/include/stdarg.h > > Open it , I found some definitions as follows: > > #define va_start(v,l) __builtin_va_start(v,l) > #define va_end(v) __builtin_va_end(v) > #define va_arg(v,l) __builtin_va_arg(v,l) > > Every macro has its __builtin_... version. I try to look for these > '__builtin_...' in gcc source code, but has not found. So, I want to > know how to check their source code. For va_start and va_end, see gcc/builtins.c. Look for BUILT_IN_VA_START and BUILT_IN_VA_END. For va_arg, look in c-*.[ch] and c-family/* and cp/* for RID_VA_ARG. Ian
