collect2: error: ld returned 1 exit status

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   98ac9a608dc79ba8a20cee77fe959a6dfccdaa63
commit: 2527ecc9195e9c66252af24c4689e8a67cd4ccb9 gpio: Fix OF build problem on UM
date:   3 weeks ago
config: um-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        git checkout 2527ecc9195e9c66252af24c4689e8a67cd4ccb9
        # save the attached .config to linux build tree
        make ARCH=um 

All errors (new ones prefixed by >>):

   arch/um/drivers/built-in.o: In function `vde_open_real':
   (.text+0xc7d1): warning: Using 'getgrnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `vde_open_real':
   (.text+0xc61c): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `vde_open_real':
   (.text+0xc935): warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `pcap_nametoaddr':
   (.text+0x1d3c5): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `pcap_nametonetaddr':
   (.text+0x1d465): warning: Using 'getnetbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `pcap_nametoproto':
   (.text+0x1d685): warning: Using 'getprotobyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/built-in.o: In function `pcap_nametoport':
   (.text+0x1d4b7): warning: Using 'getservbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   drivers/built-in.o: In function `fwnode_get_named_gpiod':
   drivers/gpio/gpiolib.c:3215: undefined reference to `of_get_named_gpiod_flags'
   drivers/built-in.o: In function `gpiod_get_index':
   drivers/gpio/gpiolib.c:3140: undefined reference to `of_get_named_gpiod_flags'
   drivers/built-in.o: In function `zx_gpio_probe':
   drivers/gpio/gpio-zx.c:229: undefined reference to `devm_ioremap_resource'
   `.text.exit' referenced in section `.fini_array' of /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/libc.a(sdlerror.o): defined in discarded section `.text.exit' of /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/libc.a(sdlerror.o)
>> collect2: error: ld returned 1 exit status

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