Fixed an issue when configuration file options partly ignored when `--project-conf` // Resolve #3034 (#3055)

* Fixed an issue when configuration file options partly ignored when using custom ``--project-conf`` // Resolve #3034

* Py2 compatible makedirs

* Fix circle dependency

* Fix broken import in test examples

* Fix history

* Remove YAPF markers

* PyLint fix

* Fix invalid project conf path

* Move PIO Core to the root on Windows, issue with long CPPPATHs

* Respect global PLATFORMIO_BUILD_CACHE_DIR env var

* Fix Appveyor paths

* Minor changes

platformio/run/helpers.py

@@ -18,16 +18,14 @@ from os.path import isdir, isfile, join
 import click
 
 from platformio import fs
-from platformio.project.helpers import (
-    compute_project_checksum,
-    get_project_dir,
-    get_project_libdeps_dir,
-)
+from platformio.project.helpers import compute_project_checksum, get_project_dir
 
 
 def handle_legacy_libdeps(project_dir, config):
     legacy_libdeps_dir = join(project_dir, ".piolibdeps")
-    if not isdir(legacy_libdeps_dir) or legacy_libdeps_dir == get_project_libdeps_dir():
+    if not isdir(legacy_libdeps_dir) or legacy_libdeps_dir == config.get_optional_dir(
+        "libdeps"
+    ):
         return
     if not config.has_section("env"):
         config.add_section("env")

platformio/run/processor.py

@@ -48,9 +48,11 @@ class EnvironmentProcessor(object):
         return variables
 
     def get_build_targets(self):
-        if self.targets:
-            return [t for t in self.targets]
-        return self.config.get("env:" + self.name, "targets", [])
+        return (
+            self.targets
+            if self.targets
+            else self.config.get("env:" + self.name, "targets", [])
+        )
 
     def process(self):
         if "platform" not in self.options: