[WIP] Bootstrappable FCMP++

[tobtoht]

This is a WIP draft PR for reproducible release builds with Rust FFI.

Based on #9436 (FCMP++ integration).

Tools

• Binutils 2.41
• LLVM 17.0.6
• Rust 1.82.0

Sub PRs

• guix: bump time-machine to 9d09b0cf841fb657a1aec12e9bab68e00c2b493c #9467

To-do (incomplete):

• Fix non-determinism on aarch64
• Vendor Rust deps in release source archive
• Split out Guix and FFI
• Test all builds

Target	Builds	Reproducible	Bootstrappable	Tested
x86_64-linux-gnu	🮱	🮱	🮱
arm-linux-gnueabihf	🮱	🮱	🮱
aarch64-linux-gnu	🮱	🮱	🮱
riscv64-linux-gnu	🮱	🮱	🮱
i686-linux-gnu	🮱	🮱	🮱
i686-w64-mingw32	🮱	🮱	🮱
x86_64-w64-mingw32	🮱	🮱	🮱
x86_64-unknown-freebsd	🮱	🮱	🮱 [1]
x86_64-apple-darwin	🮱	🮱	🮱 [2]
aarch64-apple-darwin	🮱	🮱	🮱 [2]
arm-linux-androideabi	🮱	🮱	❌ [3]
aarch64-linux-android	🮱	🮱	❌ [3]

[1] = links against precompiled freebsd system libraries
[2] = links against precompiled libraries from the darwin SDK
[3] = built with a precompiled toolchain from the Android NDK (there is currently no way around this)

Guix

Changes to the build environment

Includes packages that are available in the guix container that we use to build Monero.

package	old	new
llvm	n/a	17.0.6
rust	n/a	1.82.0

Changes to transitive build dependencies

Includes (transitive) build dependencies that are not included in the build environment.

package	old	new
gdb	n/a	12.1
libomp	11.1.0	17.0.6
procps	n/a	4.0.3

[kayabaNerve]

Rust 1.69 is being used within Monero for its LLVM/ld compatibility. There's no need to go newer and that may be simpler.

[tobtoht]

In this case, newer is easier. Guix only supports the latest version of Rust (that it has available).

This PR currently uses binutils 2.38, llvm 17.0.6. Will see if I run into problems with windows targets.

[MrCyjaneK]

Hey - I've seen that NDK task is unchecked, you can grab latest NDK patch from here: https://github.com/MrCyjaneK/monero_c/blob/master/patches/monero/0013-android-ndk-version-bump.patch and https://github.com/MrCyjaneK/monero_c/blob/master/patches/monero/0013-rename-arm-armv7a.patch it cointains some hacks - but hopefully will be useful.