Re: [gentoo-dev] [PATCH] cargo.eclass: Add cargo_target_dir helper function

[Ionen Wolkens <ionen@gentoo.org>]

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On Sat, Jun 15, 2024 at 08:14:34PM +0200, Florian Schmaus wrote:
> On 13/06/2024 17.03, James Le Cuirot wrote:
> > Several Cargo-based ebuilds cannot use cargo_src_install for various
> > reasons and manually install binaries from within the target directory
> > instead. It is common to see `target/$(usex debug debug release)`, but
> > this lacks the target ABI when cross-compiling, so provide a helper
> > function.
> 
> Glad that someone is working on better cross-compilation support for 
> rust. :)
> 
> That said, many rust ebuilds generate shell completions by invoking the 
> just compiled binary in src_install(). This does not work out of the box 
> when cross-compiling.
> 
> Is there anything we can or should do about it (besides binfmt_misc)? 
> For example, asking the according projects to implement a mechanism to 
> extract the completions files from the binary without running it, or 
> have the build system generate the completion files as result of the build?

All I can think of without changing entirely how they're generated is:
1. (worst) either make a 2nd build using CBUILD (yeah no), or BDEPEND
   on same-version self with a USE only when cross compiling
2. (lazy) skip completions w/ ewarn if tc-is-cross-compiler, just so
   it at least won't break cross over completion files that the user
   may not even care much about
3. generate them yourself with each releases and ship in a tarball,
   works out for users but extra burden for maintainer over little
4. ask upstream to provide proper release tarballs if not already and
   include pre-generated completions/docs/etc... so it's otherwise
   only a problem with arbitrary git checkouts
(3+4 may possibly be more complicated if cargo features / USE change
 cli options and thus completion files)

For one of my ebuilds I went with better-than-nothing #2.
-- 
ionen

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