C/C++ Compiler Invalidly Turning Warnings into Errors? - Realtek RTL8811AU USB WiFi

Sat Jan 24 23:05:12 UTC 2015

On 01/19/2015 08:02 AM, poma wrote:
> On 18.01.2015 20:45, Stephen Morris wrote:
>> On 01/17/2015 08:07 PM, poma wrote:
>>> On 17.01.2015 04:02, Stephen Morris wrote:
>>>> On 01/16/2015 08:38 AM, Stephen Morris wrote:
>>>>> On 01/15/2015 11:46 PM, poma wrote:
>>>>>> On 15.01.2015 08:50, Stephen Morris wrote:
>>>>>>> I have a driver for a wifi usb device that I need to compile because
>>>>>>> there are no drivers in the kernel, which has been obtained from the
>>>>>>> vendor of the device. When I attempt to compile the code the compile
>>>>>>> fails on the grounds that some warnings are being translated into
>>>>>>> errors. From my perspective these errors should not be happening
>>>>>>> because, when a debugging module wants to time stamp the build, that is
>>>>>>> not an error and is perfectly acceptable. How do I get the compiler to
>>>>>>> stop producing these errors. The messages I get are listed below.
>>>>>>>
>>>>>>> Authentication requested [root] for make driver:
>>>>>>> make ARCH=x86_64 CROSS_COMPILE= -C
>>>>>>> /lib/modules/3.17.8-300.fc21.x86_64/build
>>>>>>> M=/usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411
>>>>>>>
>>>>>>> modules
>>>>>>> make[1]: Entering directory '/usr/src/kernels/3.17.8-300.fc21.x86_64'
>>>>>>>       CC [M]
>>>>>>> /usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_cmd.o
>>>>>>>
>>>>>>>       CC [M]
>>>>>>> /usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_security.o
>>>>>>>
>>>>>>>       CC [M]
>>>>>>> /usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_debug.o
>>>>>>>
>>>>>>> /usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_debug.c:
>>>>>>>
>>>>>>> In function ‘dump_drv_version’:
>>>>>>> /usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_debug.c:66:64:
>>>>>>>
>>>>>>> error: macro "__DATE__" might prevent reproducible builds
>>>>>>> [-Werror=date-time]
>>>>>>>       DBG_871X_SEL_NL(sel, "build time: %s %s\n", __DATE__, __TIME__);
>>>>>>> ^
>>>>>>> /usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_debug.c:66:1:
>>>>>>>
>>>>>>> error: macro "__TIME__" might prevent reproducible builds
>>>>>>> [-Werror=date-time]
>>>>>>>       DBG_871X_SEL_NL(sel, "build time: %s %s\n", __DATE__, __TIME__);
>>>>>>>      ^
>>>>>>> /usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_debug.c:66:1:
>>>>>>>
>>>>>>> error: macro "__DATE__" might prevent reproducible builds
>>>>>>> [-Werror=date-time]
>>>>>>> /usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_debug.c:66:1:
>>>>>>>
>>>>>>> error: macro "__TIME__" might prevent reproducible builds
>>>>>>> [-Werror=date-time]
>>>>>>> /usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_debug.c:66:1:
>>>>>>>
>>>>>>> error: macro "__DATE__" might prevent reproducible builds
>>>>>>> [-Werror=date-time]
>>>>>>> /usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_debug.c:66:1:
>>>>>>>
>>>>>>> error: macro "__TIME__" might prevent reproducible builds
>>>>>>> [-Werror=date-time]
>>>>>>> cc1: some warnings being treated as errors
>>>>>>> scripts/Makefile.build:257: recipe for target
>>>>>>> '/usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_debug.o'
>>>>>>>
>>>>>>> failed
>>>>>>> make[2]: ***
>>>>>>> [/usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411/core/rtw_debug.o]
>>>>>>>
>>>>>>> Error 1
>>>>>>> Makefile:1377: recipe for target
>>>>>>> '_module_/usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411'
>>>>>>>
>>>>>>> failed
>>>>>>> make[1]: ***
>>>>>>> [_module_/usr/local/downloads/dlink/RTL8812AU_linux_v4.3.2_11100.20140411/driver/rtl8812AU_linux_v4.3.2_11100.20140411]
>>>>>>>
>>>>>>> Error 2
>>>>>>> make[1]: Leaving directory '/usr/src/kernels/3.17.8-300.fc21.x86_64'
>>>>>>> Makefile:1350: recipe for target 'modules' failed
>>>>>>> make: *** [modules] Error 2
>>>>>>> ##################################################
>>>>>>> Compile make driver error: 2
>>>>>>> Please check error Mesg
>>>>>>> ##################################################
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>> $ sed -i '/uninitialized/ i\EXTRA_CFLAGS += -Wno-error=date-time'
>>>>>> Makefile
>>>>>>
>>>>>> If it crashes, try your luck with these:
>>>>>>
>>>>>> $ git clone https://github.com/gnab/rtl8812au.git
>>>>>> $ cd rtl8812au/
>>>>>> ...
>>>>>> $ git clone https://github.com/abperiasamy/rtl8812AU_8821AU_linux.git
>>>>>> $ cd rtl8812AU_8821AU_linux/
>>>>>> ...
>>>>>> $ make
>>>>>> $ su
>>>>>> # cp 8812au.ko /lib/modules/$(uname -r)/updates/
>>>>>> # depmod
>>>>>> # modprobe -v 8812au
>>>>> Thanks poma, I'll check these out. The git source might be better than
>>>>> what I have at the moment as the vendor source I have seems to be
>>>>> requiring kernel config parameters that appear to not be active in the
>>>>> kernels I am using.
>>>> I've compiled the code and after copying the compiled module and running
>>>> the modprobe the device immediately connected. I'll run a few more tests
>>>> and try a reboot to see if it still works successfully.
>>>> I am assuming that I will need to perform all these steps everytime the
>>>> kernel is upgraded, would that be correct?
>>> If you put the source code on a permanent location,
>>> this part of the procedure is necessary for a new i.e. an upgraded kernel:
>>>
>>> $ cd /path/to/rtl8812au/
>>> $ make clean
>>> $ make
>>> $ su
>>> # cp 8812au.ko /lib/modules/$(uname -r)/updates/
>>> # depmod
>>> # modprobe -v 8812au
>> Thanks poma, I thought that might be the case. I already have the source
>> in a permanent location, I'll also place a text file in there with these
>> instructions so I don't forget.
>> Is the updates directory the location the default location for depmod
>> and modprobe? If a make install is done that places the ko file much
>> deeper in the directory path in a wireless subdirectory.
>> Is there any possibility that this driver will make it into the kernel
>> by default, or is the chipset too new with insufficient usage for that
>> to happen?
>>
> All locations are covered, however
> /lib/modules/$(name -r)/updates is checked for modules first.
>
> As for the device and official support in the kernel,
> you can read Larry's response that Bob sent me.
> Probably the same applies to the device you are using.
> https://lists.fedoraproject.org/pipermail/users/2014-November/455245.html
That's unfortunate. That support issue may not impact me for a lot 
longer, I'm having trouble with the device with games under windows 
where when the ping time goes through the roof the device never 
recovers, but my pci N adapter does, so I might look at moving back to a 
pci adapter. The only problem I have now is that it is very hard to get 
devices that support Linux from retail stores.
>

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