On 12 April 2023 16:58:58 BST, "Michał Górny" <mgo...@gentoo.org> wrote:
>From: Raul E Rangel <rran...@chromium.org>
>
>Python distutils packages that build C extensions are currently not
>declaring PYTHON_DEPS as part of their DEPEND declaration. This results
>in build errors when cross compiling using ROOT=.
>
>i.e.,
>   In file included from src/setproctitle.c:14:
>   In file included from src/spt.h:15:
>   src/spt_python.h:15:10: fatal error: 'Python.h' file not found
>   #include <Python.h>
>            ^~~~~~~~~~
>   1 error generated.
>
>Since the distutils-r1 eclass currently sets the RDEPEND and BDEPEND
>variables it makes sense to have the eclass also set the DEPEND
>variable. We unconditionally add it to keep the API simple. If in the
>future this is problematic, we can maybe add a DISTUTILS_PURE_PYTHON
>eclass variable that will omit the DEPEND.
>
>Signed-off-by: Raul E Rangel <rran...@chromium.org>
>Closes: https://github.com/gentoo/gentoo/pull/30469
>Signed-off-by: Michał Górny <mgo...@gentoo.org>
>---
> eclass/distutils-r1.eclass | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
>diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass
>index 09684781de2a..7e9cd6ef9b5a 100644
>--- a/eclass/distutils-r1.eclass
>+++ b/eclass/distutils-r1.eclass
>@@ -34,8 +34,8 @@
> # functions, you should consider calling the defaults (and especially
> # distutils-r1_python_prepare_all).
> #
>-# Please note that distutils-r1 sets RDEPEND and BDEPEND (or DEPEND
>-# in earlier EAPIs) unconditionally for you.
>+# Please note that distutils-r1 sets BDEPEND, DEPEND, and RDEPEND
>+# unconditionally for you.
> #
> # Also, please note that distutils-r1 will always inherit python-r1
> # as well. Thus, all the variables defined and documented there are
>@@ -307,6 +307,12 @@ _distutils_set_globals() {
>       fi
> 
>       if [[ ! ${DISTUTILS_OPTIONAL} ]]; then
>+              # This dependency is only required for packages that build
>+              # C extensions. It was deemed cleaner to unconditionally
>+              # add the dependency than add it to the individual
>+              # ebuilds that need it.
>+              DEPEND="${PYTHON_DEPS}"
>+
>               RDEPEND="${PYTHON_DEPS} ${rdep}"
>               BDEPEND="${PYTHON_DEPS} ${bdep}"
>               REQUIRED_USE=${PYTHON_REQUIRED_USE}

I think that's reasonable.
-- 
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