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kbuild: rust_is_available: check that output looks as expected
The script already checks for `$RUSTC` and `$BINDGEN` existing
and exiting without failure. However, one may still pass an
unexpected binary that does not output what the later parsing
expects. The script still successfully reports a failure as
expected, but the error is confusing. For instance:
$ RUSTC=true BINDGEN=bindgen CC=clang scripts/rust_is_available.sh
scripts/rust_is_available.sh: 19: arithmetic expression: expecting primary: "100000 * + 100 * + "
***
*** Please see Documentation/rust/quick-start.rst for details
*** on how to set up the Rust support.
***
Thus add an explicit check and a proper message for unexpected
output from the called command.
Similarly, do so for the `libclang` version parsing, too.
Link: https://lore.kernel.org/rust-for-linux/CAK7LNAQYk6s11MASRHW6oxtkqF00EJVqhHOP=5rynWt-QDUsXw@mail.gmail.com/
Signed-off-by: Miguel Ojeda <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Reviewed-by: Martin Rodriguez Reboredo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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