[PTX] error: the option Z is only accepted on the nightly compiler

[rustyx]

Getting the following error when running cargo install --path .

error: the option Z is only accepted on the nightly compiler

Full log:

error: failed to compile `tor-v3-vanity v0.1.0 (/home/user/tor-v3-vanity)`, intermediate artifacts can be found at `/home/user/tor-v3-vanity/target`

Caused by:
  failed to run custom build command for `tor-v3-vanity v0.1.0 (/home/user/tor-v3-vanity)`

Caused by:
  process didn't exit successfully: `/home/user/tor-v3-vanity/target/release/build/tor-v3-vanity-ffe1e29dcc00d7f6/build-script-build` (exit code: 1)
  --- stdout
  cargo:rustc-link-search=native=/usr/local/cuda/lib64/

  --- stderr
  [PTX] Unable to build a PTX crate!
  [PTX] warning: unused manifest key: build
  [PTX]  Downloading crates ...
  [PTX]   Downloaded syn v1.0.36
  [PTX]   Downloaded proc-macro2 v1.0.19
  [PTX]   Downloaded ed25519-compact v0.1.6
  [PTX]    Compiling proc-macro2 v1.0.19
  [PTX]    Compiling unicode-xid v0.2.1
  [PTX]    Compiling syn v1.0.36
  [PTX]    Compiling byteorder v1.3.4
  [PTX]    Compiling ed25519-compact v0.1.6
  [PTX]    Compiling rustacuda_core v0.1.2
  [PTX]    Compiling quote v1.0.7
  [PTX]    Compiling rustacuda_derive v0.1.2
  [PTX]    Compiling tor-v3-vanity-core v0.1.0 (/home/user/tor-v3-vanity/core)
  [PTX] error: the option `Z` is only accepted on the nightly compiler
  [PTX]
  [PTX] error: could not compile `tor-v3-vanity-core`
  [PTX]

[dr-bonez]

I am unable to reproduce. What version of rust are you running? On what system?

[rustyx]

rustc 1.48.0 (7eac88abb 2020-11-16) on Debian 10 x86_64

[dr-bonez]

My mistake, it seems I had rustup set to nightly on my nvidia box. It seems that ptx builder requires nightly for now. Go ahead and run cargo +nightly install --path .
I'll update the docs.

[rustyx]

Thanks, I already figured I had to switch to the nightly rust version.

[vobloeb]

It seems that the current nightly (1.60-nightly since rust-lang/cargo#10258) ignores CARGO_BUILD_PIPELINING=false

tor-v3-vanity/build.rs

Lines 5 to 6 in 609b486

	// Workaround for "crate required to be available in rlib format" bug
	std::env::set_var("CARGO_BUILD_PIPELINING", "false");

So we need

1. nightly to avoid "the option Z is only accepted on the nightly compiler"
2. quite old compiler which accepts CARGO_BUILD_PIPELINING=false.

It is sort of a deadlock: a year-old Rust-nightly is required to build the project.