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

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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


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