Update Makefile

Author: staabm

Makefile

@@ -170,18 +170,19 @@ infection:
 	git clone https://github.com/phpstan/build-infection.git || true
 	git -C build-infection fetch origin && git -C build-infection reset --hard origin/1.x
 	composer install --working-dir build-infection --no-interaction --no-progress
-	php build-infection/bin/infection-config.php --source-directory='build/PHPStan/Build'> infection.json5
+	php build-infection/bin/infection-config.php --source-directory='build/PHPStan/Build'> tmp/infection.json5
 	version=$(shell jq -r '.packages[] | select(.name == "infection/infection") | .version' build-infection/composer.lock); \
-	wget https://github.com/infection/infection/releases/download/$$version/infection.phar --no-clobber;
-	chmod +x infection.phar
+	wget -P tmp/ https://github.com/infection/infection/releases/download/$$version/infection.phar --no-clobber;
+	chmod +x tmp/infection.phar
 	XDEBUG_MODE=coverage php tests/vendor/bin/paratest \
 	  --coverage-xml=tmp/coverage/coverage-xml \
 	  --log-junit=tmp/coverage/junit.xml
+	baseBranch=$(shell git symbolic-ref refs/remotes/${remote:-origin}/HEAD | sed 's,.*/,,') \
 	php infection.phar \
-	  --git-diff-base=origin/2.1.x \
+	  --configuration=tmp/infection.json5
+	  --git-diff-base=origin/$$baseBranch \
 	  --git-diff-lines \
 	  --coverage=tmp/coverage \
 	  --skip-initial-tests \
 	  --ignore-msi-with-no-mutations \
 	  --logger-text=php://stdout
-	rm infection.json5 infection.phar