Add --embed for Python 3.8

python-config-wrapper

@@ -0,0 +1,35 @@
+#!/bin/sh
+# python3-config wrapper script to support Python 3.8
+# Works around https://bugs.python.org/issue36721
+
+set -e
+
+usage() {
+    echo "Usage: $0 [python3-config] (--libs|--includes)"
+    exit 1
+}
+
+if [ $# -ne 2 ]; then
+    usage
+fi
+
+PYTHON_CONFIG="$1"
+shift
+
+WHICH_FLAG="$1"
+shift
+
+case "$WHICH_FLAG" in
+    --libs)
+        # Python 3.8 needs --embed, but previous versions do not have it:
+        # https://github.com/python/cpython/pull/13500
+        "$PYTHON_CONFIG" --ldflags --libs --embed 2>/dev/null ||
+            "$PYTHON_CONFIG" --ldflags --libs
+        ;;
+    --includes)
+        "$PYTHON_CONFIG" --includes
+        ;;
+    *)
+        usage
+        ;;
+esac

python.pri

@@ -4,5 +4,5 @@ isEmpty(PYTHON_CONFIG) {
 
 message(PYTHON_CONFIG = $$PYTHON_CONFIG)
 
-QMAKE_LIBS += $$system($$PYTHON_CONFIG --ldflags --libs)
-QMAKE_CXXFLAGS += $$system($$PYTHON_CONFIG --includes)
+QMAKE_LIBS += $$system($$PWD/python-config-wrapper $$PYTHON_CONFIG --libs)
+QMAKE_CXXFLAGS += $$system($$PWD/python-config-wrapper $$PYTHON_CONFIG --includes)