strange printf(9) format specifier ("Z") in dev/drm code

[Andriy Gapon]

on 05/12/2011 16:38 Alexander Best said the following:
> On Mon Dec  5 11, Sergey Kandaurov wrote:
>> On 5 December 2011 02:22, Alexander Best <arundel at freebsd.org> wrote:
>>> hi there,
>>>
>>> i was going through the clang warnings from a GENERIC buildkernel and noticed
>>> the following:
>>>
>>> ===> drm/mga (all)
>>> /usr/subversion-src/sys/modules/drm/mga/../../../dev/drm/mga_state.c:56:2: error: invalid conversion specifier 'Z' [-Werror,-Wformat-invalid-specifier]
>>>        BEGIN_DMA(2);
>>>        ^~~~~~~~~~~
>>> @/dev/drm/mga_drv.h:291:35: note: expanded from:
>>>                DRM_INFO( "   space=0x%x req=0x%Zx\n",                  \
>>>                                                ^
>>> @/dev/drm/drmP.h:317:60: note: expanded from:
>>> #define DRM_INFO(fmt, ...)  printf("info: [" DRM_NAME "] " fmt , ##__VA_ARGS__)
>>>                                                           ^
>>> these lines should cover all warnings:
>>>
>>> otaku% egrep -r "%[0-9]*Zx" /usr/src/sys/dev/drm
>>> dev/drm/mga_drv.h:              DRM_INFO( "   space=0x%x req=0x%Zx\n",                  \
>>> dev/drm/mga_drv.h:              DRM_INFO( "   DMA_WRITE( 0x%08x ) at 0x%04Zx\n",        \
>>>
>>> ... i couldn't find a reference to an upercase "Z" in the printf(9) man page.
>>> i talked to dinoex on #freebsd-clang (EFNet) and he said that the "Z" might
>>> come from linux'es libc5 and is the equaivalent to glibc's "z".
>>>
>>> can we adjust those lines, so the clang warnings disappear?
>>
>> Hi, Alexander.
>>
>> Can you build-test with this change?
>> Thanks in advance.
> 
> no that didn't work, but the following patch fixed it for me.

What about Z => z ?

-- 
Andriy Gapon