[Xen-devel] XEN 3.0.1 vsprintf.c - strange macro expansion

[Armand Puccetti <apuccett@xxxxxxxxxxxxxxxxxxxxxx>]

When preprocessing the file vsprintf.c, macro 'va_arg' gets expanded 
into '__builtin_va_arg', which is not XEN code.
For instance, at line 317 of that file,

   field_width = va_arg(args,int);

becomes

   field_width = __builtin_va_arg(args,int);

using the preprocessing command below.

   cpp -C -E -nostdinc -iwithprefix include -I.../xen-3.0.1/xen/include 
-I.../xen-3.0.1/xen/include/asm-x86/mach-generic 
-I.../xen-3.0.1/xen/include/asm-x86/mach-default -DNDEBUG -D__i386__ 
vsprintf.c
The def inition of macro va_arg is located in file acenv.h:298, but has 
little to do with this result.
Settings: Compiler: gcc 4.0.2, OS: Ubuntu Linux kernel 2.6.12.10

What might be the reason of this behavior? A bug in gcc?





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