Solana Rust smart contract build error: build failed - rust

Question

I am a beginner Solana/Rust developer.
As my first Solana project, I built the mint NFT contract.
And then I want to deploy the contract.
So to get the compiled output .so file, I did run like: cargo build,
but getting this error:
warning: cc: warning: src/main.rs: linker input file unused because linking not done
warning: ar: /home/rango/my_tasks/mintdropz/solana-nft-contract/target/debug/build/solana-nft-7f2fc6a536921641/out/src/main.o: No such file or directory
error: failed to run custom build command for `solana-nft v0.1.0 (/home/rango/my_tasks/mintdropz/solana-nft-contract)`
Caused by:
process didn't exit successfully: `/home/rango/my_tasks/mintdropz/solana-nft-contract/target/debug/build/solana-nft-cbb36a23539fa380/build-script-build` (exit status: 1)
--- stdout
cargo:rerun-if-changed=src/main.rs
TARGET = Some("x86_64-unknown-linux-gnu")
OPT_LEVEL = Some("0")
HOST = Some("x86_64-unknown-linux-gnu")
CC_x86_64-unknown-linux-gnu = None
CC_x86_64_unknown_linux_gnu = None
HOST_CC = None
CC = None
CFLAGS_x86_64-unknown-linux-gnu = None
CFLAGS_x86_64_unknown_linux_gnu = None
HOST_CFLAGS = None
CFLAGS = None
CRATE_CC_NO_DEFAULTS = None
DEBUG = Some("true")
CARGO_CFG_TARGET_FEATURE = Some("fxsr,sse,sse2")
running: "cc" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "-m64" "-Wall" "-Wextra" "-o" "/home/rango/my_tasks/mintdropz/solana-nft-contract/target/debug/build/solana-nft-7f2fc6a536921641/out/src/main.o" "-c" "src/main.rs"
cargo:warning=cc: warning: src/main.rs: linker input file unused because linking not done
exit status: 0
AR_x86_64-unknown-linux-gnu = None
AR_x86_64_unknown_linux_gnu = None
HOST_AR = None
AR = None
running: "ar" "cq" "/home/rango/my_tasks/mintdropz/solana-nft-contract/target/debug/build/solana-nft-7f2fc6a536921641/out/libhello.a" "/home/rango/my_tasks/mintdropz/solana-nft-contract/target/debug/build/solana-nft-7f2fc6a536921641/out/src/main.o"
cargo:warning=ar: /home/rango/my_tasks/mintdropz/solana-nft-contract/target/debug/build/solana-nft-7f2fc6a536921641/out/src/main.o: No such file or directory
exit status: 1
--- stderr
error occurred: Command "ar" "cq" "/home/rango/my_tasks/mintdropz/solana-nft-contract/target/debug/build/solana-nft-7f2fc6a536921641/out/libhello.a" "/home/rango/my_tasks/mintdropz/solana-nft-contract/target/debug/build/solana-nft-7f2fc6a536921641/out/src/main.o" with args "ar" did not execute successfully (status code exit status: 1).
warning: build failed, waiting for other jobs to finish...
error: build failed
this is build.rs file:
// Example custom build script.
fn main() {
// Tell Cargo that if the given file changes, to rerun this build script.
println!("cargo:rerun-if-changed=src/main.rs");
// Use the `cc` crate to build a C file and statically link it.
cc::Build::new()
.file("src/main.rs")
.compile("hello");
}
this is Cargo.toml file:
[package]
name = "solana-nft"
version = "0.1.0"
edition = "2018"
[dependencies]
solana-client = "1.7.8"
solana-sdk = "1.7.8"
spl-token = { version = "3.2.0", features = [ "no-entrypoint" ] }
rand = "0.8.4"
solana-program = "1.7.11"
spl-token-metadata = "0.0.1"
openssl = { version = "0.10", features = ["vendored"] }
[build-dependencies]
cc = "1.0"
bindgen = "0.53.1"
I am using ubuntu 18.04, cargo 1.56.0 .
What am I doing wrong?

Answer 1

If you are trying to build a Rust Solana Program (i.e. Smart Contract) you only need to cargo build-bpf as Programs get compiled to BPF through LLVM and that is what is deployed on Solana

Answer 2

This seems to be a compatible issue. install the latest version of rustc
Also when u install the solana toolkit:
sh -c "$(curl -sSfL https://release.solana.com/v1.9.5/install)"
Make sure you update your PATH environment variable to include the solana programs:

Answer 3

I think Solana stable version solves your problem.
sh -c "$(curl -sSfL https://release.solana.com/stable/install)"