charmcraft.yaml: Add missing build-packages

Not all supported architectures have binary wheels available on
PyPi.  For those architectures the wheels will be built from
source, and as such we need to add build system library
dependencies to allow the build to succeed.

Also set the MAKEFLAGS environment variable to allow the source
builds to use available processors for parallel compilation.

Add -p parameter to mkdir in the override-prime entry point
recipe in case the directory already exists.

Change-Id: I83d2a41167cfb96ee38fbb95987f4e6c36ce2753

charmcraft.yaml

@@ -7,6 +7,13 @@ parts:
       - git
       - python3-dev
       - libffi-dev
+      - libssl-dev
+      - libxml2-dev
+      - libxslt1-dev
+      - rustc
+      - cargo
+    build-environment:
+      - MAKEFLAGS: -j$(nproc)
     override-build: |
       apt-get install ca-certificates -y
       tox -e build-reactive
@@ -19,7 +26,7 @@ parts:
       # hooks directory.
       cp -r $CRAFT_STAGE/* .
       # Charmcraft looks for this specific entry point.
-      mkdir src
+      mkdir -p src
       ln -sf ../hooks/start src/charm.py
 
 bases:

tox.ini

@@ -42,7 +42,7 @@ commands =
 [testenv:build-reactive]
 basepython = python3
 commands =
-    charm-build --log-level DEBUG --use-lock-file-branches --binary-wheels -o {toxinidir}/build/builds src {posargs}
+    charm-build --log-level DEBUG --use-lock-file-branches --binary-wheels-from-source -o {toxinidir}/build/builds src {posargs}
 
 [testenv:add-build-lock-file]
 basepython = python3