linux-kernel - RE: [PATCH] rust: Use awk instead of recent xargs

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Date:   Fri, 29 Sep 2023 21:36:06 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Joe Perches' <joe@...ches.com>,
        Matthew Maurer <mmaurer@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        "Wedson Almeida Filho" <wedsonaf@...il.com>
CC:     Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        "Alice Ryhl" <aliceryhl@...gle.com>,
        "rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] rust: Use awk instead of recent xargs

From: Joe Perches
> Sent: 28 September 2023 21:33
> 
> On Thu, 2023-09-28 at 20:21 +0000, Matthew Maurer wrote:
> > `awk` is already required by the kernel build, and the `xargs` feature
> > used in current Rust detection is not present in all `xargs` (notably,
> > toybox based xargs, used in the Android kernel build).
> []
> > diff --git a/rust/Makefile b/rust/Makefile
> []
> > @@ -365,8 +365,7 @@ quiet_cmd_exports = EXPORTS $@
> >        cmd_exports = \
> >  	$(NM) -p --defined-only $< \
> >  		| grep -E ' (T|R|D) ' | cut -d ' ' -f 3 \
> > -		| xargs -Isymbol \
> > -		echo 'EXPORT_SYMBOL_RUST_GPL(symbol);' > $@
> > +		| awk 'NF {printf "EXPORT_SYMBOL_RUST_GPL(%s);\n",$$0}' > $@
> 
> Perhaps remove the cut as well and use $$3 instead of $$0 ?
> Maybe integrate the grep as well.

Or keep the grep and use a shell loop?
	grep -E ' (T|R|D) ' | while read val flag symbol; do \
		echo "EXPORT_SYMBOL_RUST_GPL($symbol);"; done

(The grep is typically much faster than a shell conditional.)

	David

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