I have updated some test systems (x86_64 and aarch64) to pre-beta Fedora 32, which now includes GCC 10:

$ gcc --version
gcc (GCC) 10.0.1 20200216 (Red Hat 10.0.1-0.8)

There have been a couple of problems with kernel compilation, but in each case there was already a patch/workaround available..

https://www.spinics.net/linux/fedora/fedora-arm/msg13193.html and https://lkml.org/lkml/2020/1/29/494

The most serious problem was a kernel crash on boot, on a VMware F32 guest system:

…………………..
[ 0.062278] smpboot: CPU 1 Converting physical 0 to logical die 1 [ 0.062278] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: start_secondary+0x1b9/0x1c0
[ 0.062278] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-0.rc0.git1.1.fc32 .x86_64 #1
[ 0.062278] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.
0-2.fc30 04/01/2014
[ 0.062278] Call Trace:
[ 0.062278] dump_stack+0x8b/0xc8
[ 0.062278] panic+0x10d/0x302
[ 0.062278] ? start_secondary+0x1b9/0x1c0
[ 0.062278] __stack_chk_fail+0x15/0x20
[ 0.062278] start_secondary+0x1b9/0x1c0
[ 0.062278] secondary_startup_64+0xb6/0xc0 [ 0.062278] ---[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: start_secondary+0x1b9/0x1c0 ]---

The workaround is to de-select CONFIG_STACKPROTECTOR_STRONG in the kernel config,  ‘General architecture-dependent options / Stack Protector buffer overflow detection / Strong Stack Protector’

The latest Kernel-5.6-patched versions of NVIDIA 440.59, and VMware 15.5.1, compile OK, but one system gave a ‘Failed to get gcc information.‘ error:

# vmware-modconfig --console --install-all
[AppLoader] GLib does not have GSettings support.
Failed to get gcc information.

But — on another F32 system it all worked OK:

# vmware-modconfig --console --install-all
[AppLoader] GLib does not have GSettings support.
Stopping vmware (via systemctl): [ OK ]
make: Entering directory '/tmp/modconfig-tl9WqU/vmmon-only'
Using kernel build system.
.............  etc .....................

On the ‘failed’ system, the vmmon and vmnet modules each compiled successfully, so more investigation is needed!

Robert Gadsdon.   February 21st 2020.