Wireguard not building on pre-rc1 4.19 kernels (Fedora)

Wireguard not building on pre-rc1 4.19 kernels (Fedora)

[Bruno Wolff III]

[bruno@cerberus src]$ make KERNELDIR=/lib/modules/4.19.0-0.rc0.git6.1.fc30.x86_64/build clean all
  CLEAN   /home/bruno/WireGuard/src/.tmp_versions
  CLEAN   /home/bruno/WireGuard/src/tools/{wg,*.o,*.d}
  CC [M]  /home/bruno/WireGuard/src/main.o
In file included from <command-line>:
/home/bruno/WireGuard/src/compat/compat.h:684:20: error: static declaration of ‘rng_is_initialized’ follows non-static declaration
 static inline bool rng_is_initialized(void)
                    ^~~~~~~~~~~~~~~~~~
In file included from ./include/linux/net.h:22,
                 from ./include/linux/skbuff.h:29,
                 from ./include/linux/ip.h:20,
                 from /home/bruno/WireGuard/src/compat/compat.h:640,
                 from <command-line>:
./include/linux/random.h:39:13: note: previous declaration of ‘rng_is_initialized’ was here
 extern bool rng_is_initialized(void);
             ^~~~~~~~~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:311: /home/bruno/WireGuard/src/main.o] Error 1
make[1]: *** [Makefile:1514: _module_/home/bruno/WireGuard/src] Error 2
make: *** [Makefile:36: module] Error 2
[bruno@cerberus src]$ 

Re: Wireguard not building on pre-rc1 4.19 kernels (Fedora)

[Aaron Jones]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

This will be because Jason's RNG patch landed in mainline, but the
kernel version number won't get bumped (so compat.h can use it
properly) until 4.19 is released.

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Re: Wireguard not building on pre-rc1 4.19 kernels (Fedora)

[Bruno Wolff III]

On Mon, Aug 20, 2018 at 14:43:53 +0000,
  Aaron Jones <aaronmdjones@gmail.com> wrote:
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA512
>
>This will be because Jason's RNG patch landed in mainline, but the
>kernel version number won't get bumped (so compat.h can use it
>properly) until 4.19 is released.

Thanks. That was enough information to tell me what to do to get it to 
work with a temporary hack. I'm using a successful build as I type this.

Re: Wireguard not building on pre-rc1 4.19 kernels (Fedora)

[Bruno Wolff III]

Jason pushed a fix for this and now I am able to use vanilla WireGuard with 
4.19 kernels.