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tools/xenstore: Check the format printf for xprintf() and barf{,_perr…
…or}() Allow GCC to analyze the format printf for xprintf() and barf{,_perror}(). Take the opportunity to define __noreturn to make the prototype for barf{,_perror})() easier to read. Also document why 'extern' is used for xprintf(). Signed-off-by: Julien Grall <jgrall@amazon.com> Reviewed-by: Juergen Gross <jgross@suse.com> Reviewed-by: Ian Jackson <iwj@xenproject.org> Release-Acked-by: Ian Jackson <iwj@xenproject.org>
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