Hello, Gentoo.

I've just been trying the update for python 3.13.  It went well on my
new machine (well, after unmerging app-portage/unsymlink-lib, which was
debris from some 2019 update).

On my old machine, however, there was a seg fault while merging rust.
This is a known problem in certain first generation Ryzen processors.

However, this left the build wedged: emerge says that there's a circular
dependency from rust to itself.  More precisely, the error message looks
like:

#########################################################################

[ebuild  NS    ] dev-lang/rust-1.85.1:1.85.1::gentoo 
[1.81.0-r100:1.81.0::gentoo, 1.82.0-r101:1.82.0::gentoo, 
1.83.0-r2:1.83.0::gentoo, 1.84.1-r1:1.84.1::gentoo] USE="(-big-endian) -clippy 
-debug -dist -doc (-llvm-libunwind) -lto -rust-analyzer -rust-src -rustfmt 
(-system-llvm) -test -verify-sig -wasm (-miri%) (-nightly%) 
(-parallel-compiler%)" ABI_X86="(64) -32 (-x32)" CPU_FLAGS_X86="sse2" 
LLVM_SLOT="(19)" LLVM_TARGETS="(X86) -AArch64 -AMDGPU -ARC -ARM -AVR -BPF -CSKY 
-DirectX -Hexagon -Lanai -LoongArch -M68k -MSP430 -Mips -NVPTX -PowerPC -RISCV 
-SPIRV -Sparc -SystemZ -VE -WebAssembly -XCore -Xtensa" 0 KiB

Total: 1 package (1 in new slot), Size of downloads: 0 KiB

 * Error: circular dependencies:

(dev-lang/rust-1.85.1:1.85.1/1.85.1::gentoo, ebuild scheduled for merge) 
depends on
 (dev-lang/rust-1.85.1:1.85.1/1.85.1::gentoo, ebuild scheduled for merge) 
(buildtime)

 * Note that circular dependencies can often be avoided by temporarily
 * disabling USE flags that trigger optional dependencies.

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

dev-python/gpep517:0

#########################################################################

(and so on).

This would appear to be a bug in the rust ebuild - it has set itself as a
builtime dependency before it had been built - or something like that.

How do I best recover from this?

-- 
Alan Mackenzie (Nuremberg, Germany).

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