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

Sun Jan 18 21:02:36 UTC 2015

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