Re: [gentoo-dev] [PATCH v3] python-utils-r1.eclass: Fix PYTHON_SITEDIR/INCLUDEDIR for cross-prefix

["Michał Górny" <mgorny@gentoo.org>]

On Wed, 2023-08-16 at 13:16 +0100, James Le Cuirot wrote:
> We dynamically determine Python's SITEDIR and INCLUDEDIR using the build
> host's Python. This breaks down when the build host's prefix differs
> from the target host's prefix, so chop off the former and prepend the
> latter.
> 
> This assumes that each Python implementation is always installed using
> the same scheme. Meson already makes this assumption, and gpep517 makes
> a similar assumption to determine Python's stdlib location.
> 
> We could improve on this and determine these locations using SYSROOT's
> sysconfigdata file, like gpep517 does, but this seems needlessly
> complex. We would need to take this approach for PYTHON_LIBPATH and
> PYTHON_CONFIG, but these are only used by handful of packages.
> 
> ${BROOT-${EPREFIX}} is needed rather than plain ${BROOT} for the same
> reason we need it for PYTHON, namely that Portage <3.0.50 was buggy.
> 
> Signed-off-by: James Le Cuirot <chewi@gentoo.org>
> ---
> 
> Note that gpep517 also needs the same treatment, but I'll handle that
> later. This at least allows Portage itself to be installed.
> 
>  eclass/python-utils-r1.eclass | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/eclass/python-utils-r1.eclass b/eclass/python-utils-r1.eclass
> index 2fffd6d56bf5..f9c6d161d3f3 100644
> --- a/eclass/python-utils-r1.eclass
> +++ b/eclass/python-utils-r1.eclass
> @@ -351,6 +351,7 @@ _python_export() {
>  						print(sysconfig.get_path("purelib"))
>  					EOF
>  				)
> +				PYTHON_SITEDIR=${EPREFIX}${PYTHON_SITEDIR#"${BROOT-${EPREFIX}}"}
>  				export PYTHON_SITEDIR
>  				debug-print "${FUNCNAME}: PYTHON_SITEDIR = ${PYTHON_SITEDIR}"
>  				;;
> @@ -362,6 +363,7 @@ _python_export() {
>  						print(sysconfig.get_path("platinclude"))
>  					EOF
>  				)
> +				PYTHON_INCLUDEDIR=${ESYSROOT}${PYTHON_INCLUDEDIR#"${BROOT-${EPREFIX}}"}
>  				export PYTHON_INCLUDEDIR
>  				debug-print "${FUNCNAME}: PYTHON_INCLUDEDIR = ${PYTHON_INCLUDEDIR}"
> 
> --
> 2.41.0
> 

Pushed (along with some other pending changes), thanks!

-- 
Best regards,
Michał Górny