How to check the source code of stdarg?

Wed Nov 2 13:37:00 GMT 2011


    The gcc implements the stdarg.h to support variable parameters
functions. I wonder how it work. So, I find the stdarg.h at


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.

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