On 18 Sep 2016, at 20:37, Alex T. <diox...@gmail.com> wrote:
> 
> I'm on stable/10 branch and have been using it to rebuild world
> and kernel. This is the revision I'm currently trying to build but
> started seeing the following issue way before it.
> 
> URL: svn://svn.freebsd.org/base/stable/10
> Revision: 305760
> 
> The world builds fine, but building the kernel fails with this error:
> 
> /usr/src/sys/cam/cam_xpt.c:1060:27: error:
>      invalid conversion specifier 'b'
>      [-Werror,-Wformat-invalid-specifier]
>  ...printf("%s%d: quirks=0x%b\n", perip...
>                            ~^
> /usr/src/sys/cam/cam_xpt.c:1061:36: error:
>      data argument not used by format
>      string [-Werror,-Wformat-extra-args]
>  ...periph->unit_number, quirks, bit_st...
> 
> This is how my /etc/make.conf looks like:
> WITH_PKGNG=yes
> SSP_CFLAGS=-fstack-protector-all
> WITH_SSP_PORTS=yes
> WITHOUT="DOCS"
> 
> and I don't have /etc/src.conf. Has anyone seen this issue?
> 
> Any idea what might me misconfigured missing here?

It's hard to say what is different on your system, but it looks like the
-fformat-extensions flag is somehow not being used for building your
kernel.  If you can't figure out what causes this, you can try to work
around it by setting WITHOUT_FORMAT_EXTENSIONS, or setting WERROR to
empty.

-Dimitry

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