component/rust: new component

component/rust/buildout.cfg

+[buildout]
+parts =
+  rustc
+
+extends =
+    ../cmake/buildout.cfg
+    ../curl/buildout.cfg
+    ../git/buildout.cfg
+    ../openssl/buildout.cfg
+    ../pkgconfig/buildout.cfg
+    ../defaults.cfg
+
+[rustc]
+recipe = slapos.recipe.cmmi
+shared = true
+url = https://static.rust-lang.org/dist/rustc-1.45.2-src.tar.gz
+md5sum = 1c67d7c3f211e49e12e7c20abab08e70
+# --sysconfdir is a workaround for https://github.com/rust-lang/rust/issues/63915
+configure-options = --enable-extended --sysconfdir=@@LOCATION@@/etc/ --python=${python:location}/bin/python
+environment = 
+    PATH=${cmake:location}/bin/:${curl:location}/bin/:${git:location}/bin/:${pkgconfig:location}/bin/:%(PATH)s
+    PKG_CONFIG_PATH=${openssl:location}/lib/pkgconfig:

[Julien Muchembled]

Isn't --python buggy (6acdc8ca & no such 'python' in the case of Python 3) and useless (python in $PATH) ?