Add cargo-build-bpf

[mvines]

cargo-build-bpf is a less opinionated version of sdk/bpf/rust/build.sh. It:

• Doesn't care if you don't have a Xargo.toml or Cargo.toml in the current directory (both Cargo and Xargo search up the tree)
• Doesn't impose --no-default-features --features program on you
• When in the path, slides in to your normal cargo workflow as cargo build-bpf ...
• Gets installed by solana-install .. so it just works once you get the solana cli installed

Example: build parts of the tree for BPF:

$ cd sdk/
$ ../cargo-build-bpf --no-default-features --features program

$ cd programs/bpf/rust/sysval
$ ../../../../cargo-build-bpf --no-default-features --features program 

(note: once program-sdk/ exists (#12989), these extra args disappear)

TODO

• Strip object like do.sh does
• Add --dump flag to obsolete do.sh dump ...

[mvines]

Welp looks like I need to rewrite cargo-build-bpf in Rust to get at cargo metadata output sanely, probably for the best.

[mvines]

Neat, I cherry-picked this PR on top of #12989 and it works!

~/ws/s1/sdk/program$ ../../cargo-build-bpf 
+ exec /Users/mvines/ws/s1/sdk/bpf/dependencies/xargo/bin/xargo build --target bpfel-unknown-unknown --release
    Finished release [optimized] target(s) in 0.18s

[mvines]

Rewrote cargo-build-bpf in Rust and it's feeling really nice.

~/ws/s1$ cd programs/bpf/rust/sha256
~/ws/s1/programs/bpf/rust/sha256$ cargo build-bpf
Running: /Users/mvines/ws/s1/sdk/bpf/rust/xargo-build.sh --no-default-features --features=program
   Compiling solana-frozen-abi v1.5.0 (/Users/mvines/ws/s1/frozen-abi)
   Compiling solana-sdk v1.5.0 (/Users/mvines/ws/s1/sdk)
   Compiling solana-bpf-rust-sha256 v1.5.0 (/Users/mvines/ws/s1/programs/bpf/rust/sha256)
    Finished release [optimized] target(s) in 4.83s
Running: /Users/mvines/ws/s1/sdk/bpf/scripts/strip.sh /Users/mvines/ws/s1/programs/bpf/target/bpfel-unknown-unknown/release/solana_bpf_rust_sha256.so /Users/mvines/ws/s1/programs/bpf/target/bpfel-unknown-unknown/deploy/solana_bpf_rust_sha256.so

Now wander over to SPL land:

$ cd ~/ws/spl/token/program
$ cargo build-bpf
Running: /Users/mvines/ws/s1/sdk/bpf/rust/xargo-build.sh --no-default-features --features=program
    Finished release [optimized] target(s) in 0.26s
Running: /Users/mvines/ws/s1/sdk/bpf/scripts/strip.sh /Users/mvines/ws/spl/target/bpfel-unknown-unknown/release/spl_token.so /Users/mvines/ws/spl/target/bpfel-unknown-unknown/deploy/spl_token.so

It's smart enough to know when it's not building a cdylib too:

~/ws/s1/frozen-abi$ cargo build-bpf
Note: solana-frozen-abi crate does not contain a cdylib target
Running: /Users/mvines/ws/s1/sdk/bpf/rust/xargo-build.sh
   Compiling solana-frozen-abi v1.5.0 (/Users/mvines/ws/s1/frozen-abi)
    Finished release [optimized] target(s) in 1.06s

and trying to build something silly produces a reasonable error output:

~/ws/s1/validator$ cargo build-bpf
Note: solana-validator crate does not contain a cdylib target
Running: /Users/mvines/ws/s1/sdk/bpf/rust/xargo-build.sh
Error: Failed to find Xargo.toml

Please create a Xargo.toml file in the same directory as your Cargo.toml with
the following contents:

  [target.bpfel-unknown-unknown.dependencies.std]
  features = []

[jackcmay]

Looking good, nice to see the build scripts tucked under a cargo subcommand

[mvines]

This is pretty much ready to land, latest commit deletes do.sh 👢

[codecov]

Codecov Report

Merging #13040 into master will decrease coverage by 0.0%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #13040     +/-   ##
=========================================
- Coverage    82.1%    82.1%   -0.1%     
=========================================
  Files         366      366             
  Lines       86237    86237             
=========================================
- Hits        70878    70869      -9     
- Misses      15359    15368      +9     

[mvines]

ooo, green CI. Now's my chance!