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Date: Wed, 30 May 2018 12:24:59 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Matt Macy <mmacy@FreeBSD.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r334361 - head/usr.sbin/pmc
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On Wed, May 30, 2018 at 12:06:17AM +0000, Matt Macy wrote:
> Author: mmacy
> Date: Wed May 30 00:06:17 2018
> New Revision: 334361
> URL: https://svnweb.freebsd.org/changeset/base/334361
> 
> Log:
>   pmc: don't break build with format issues
> 
> Modified:
>   head/usr.sbin/pmc/Makefile
> 
> Modified: head/usr.sbin/pmc/Makefile
> ==============================================================================
> --- head/usr.sbin/pmc/Makefile	Tue May 29 23:08:33 2018	(r334360)
> +++ head/usr.sbin/pmc/Makefile	Wed May 30 00:06:17 2018	(r334361)
> @@ -9,4 +9,5 @@ LIBADD=	kvm pmc m ncursesw pmcstat elf
>  
>  SRCS=	pmc.c pmc_util.c cmd_pmc_stat.c
>  
> +CWARNFLAGS.cmd_pmc_stat.c=	-Wno-format
>  .include <bsd.prog.mk>
So this builds knownly broken binary instead of stopping.

If I understand your troubles right, the usual solution for them is
	printf("%jx", (uintmax_t)trouble);
used in many places around the kernel, less so in userspace.