package/archlinux: use Ninja Multi-Config for the dev PKGBUILD.

So I have at least some semi-convenient way to switch to a debug build
in order to debug a strange crash or assertion.

doc/python/conf.py

@@ -3,7 +3,10 @@ import sys
 from typing import List
 
 # TODO make this less brittle
-sys.path = [os.path.join(os.path.dirname(__file__), '../../build/src/python/')] + sys.path
+sys.path = [
+    os.path.join(os.path.dirname(__file__), '../../build/src/python/'),
+    os.path.join(os.path.dirname(__file__), '../../build/src/python/Release')
+] + sys.path
 
 import corrade
 import corrade.containers

package/archlinux/PKGBUILD

@@ -13,22 +13,28 @@ provides=('magnum-bindings-git')
 
 _rootdir=$startdir/../../
 
+_buildtype=Release
+# _buildtype=Debug
+
 build() {
     mkdir -p "$_rootdir/build"
     cd "$_rootdir/build"
 
+    # Only one of these is built
     cmake .. \
-        -DCMAKE_BUILD_TYPE=Release \
+        -DCMAKE_CONFIGURATION_TYPES="Release;Debug;RelWithDebInfo" \
+        -DCMAKE_CROSS_CONFIGS=all \
+        -DCMAKE_CXX_FLAGS_RELWITHDEBINFO="-O2 -g -DNDEBUG -fno-omit-frame-pointer" \
         -DCMAKE_INSTALL_PREFIX=/usr \
         -DMAGNUM_WITH_PYTHON=ON \
         -DMAGNUM_BUILD_TESTS=ON \
-        -G Ninja
-    ninja
+        -G "Ninja Multi-Config"
+    ninja all:$_buildtype
 }
 
 check() {
     cd "$_rootdir/build"
-    CORRADE_TEST_COLOR=ON ctest --output-on-failure
+    CORRADE_TEST_COLOR=ON ctest --output-on-failure -C $_buildtype
 
     cd "$_rootdir/src/python/corrade"
     python -m unittest -v
@@ -43,9 +49,9 @@ check() {
 package() {
     # Helper headers
     cd "$_rootdir/build"
-    DESTDIR="$pkgdir/" ninja install
+    DESTDIR="$pkgdir/" ninja install:$_buildtype
 
     # Native and python packages
-    cd "$_rootdir/build/src/python"
+    cd "$_rootdir/build/src/python/$_buildtype"
     python setup.py install --root="$pkgdir" --prefix=/usr
 }

src/python/corrade/test/__init__.py

@@ -27,4 +27,7 @@ import os
 import sys
 
 # TODO: do this differently / more robustly
-sys.path = [os.path.join(os.path.dirname(__file__), os.environ.get('CMAKE_BINARY_DIR', '../../../../build'), 'src/python')] + sys.path
+sys.path = [
+    os.path.join(os.path.dirname(__file__), os.environ.get('CMAKE_BINARY_DIR', '../../../../build'), 'src/python'),
+    os.path.join(os.path.dirname(__file__), os.environ.get('CMAKE_BINARY_DIR', '../../../../build'), 'src/python/Release')
+] + sys.path

src/python/magnum/test/__init__.py

@@ -28,7 +28,10 @@ import sys
 import unittest
 
 # TODO: do this differently / more robustly
-sys.path = [os.path.join(os.path.dirname(__file__), os.environ.get('CMAKE_BINARY_DIR', '../../../../build'), 'src/python')] + sys.path
+sys.path = [
+    os.path.join(os.path.dirname(__file__), os.environ.get('CMAKE_BINARY_DIR', '../../../../build'), 'src/python'),
+    os.path.join(os.path.dirname(__file__), os.environ.get('CMAKE_BINARY_DIR', '../../../../build'), 'src/python/Release'),
+] + sys.path
 
 from magnum import *
 from magnum import gl, platform