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

[poma]

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