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Use CARGO env variable if present (#453)

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* Run `$CARGO -vV` in `detect-targets` if env `CARGO` present
* Improve crate doc for `detect-targets`
* Use env var `CARGO` in `install_from_source` if present
* Test use of `CARGO` env in `tests.sh`

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>
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Jiahao XU 2022-10-02 01:52:25 +10:00 • committed by GitHub
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6
crates/detect-targets/src/lib.rs
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@ -1,5 +1,11 @@
//! Detect the target at the runtime.
//!
//! It runs `$CARGO -vV` if environment variable `CARGO` is present
//! for cargo subcommands, otherwise it would try running `rustc -vV`.
//!
//! If both `rustc` isn't present on the system, it will fallback
//! to using syscalls plus `ldd` on Linux to detect targets.
//!
//! Example use cases:
//! - The binary is built with musl libc to run on anywhere, but
//! the runtime supports glibc.