From 7322df26ad8d43029b992a9bd3f3369840bc40da Mon Sep 17 00:00:00 2001
From: Ivan Kravets <me@ikravets.com>
Date: Mon, 19 Nov 2018 19:06:56 +0200
Subject: [PATCH] Fix an issue when Library Dependency Finder (LDF) does not
 handle project `src_filter ` // Resolve #1905

---
 HISTORY.rst                        | 2 ++
 platformio/builder/tools/piolib.py | 9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/HISTORY.rst b/HISTORY.rst
index 56dd7863..a83b34f9 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -11,6 +11,8 @@ PlatformIO 3.0
 * Fixed incorrect wording when initializing/updating project
 * Fixed an issue with incorrect order for library dependencies ``CPPPATH``
   (`issue #1914 <https://github.com/platformio/platformio-core/issues/1914>`_)
+* Fixed an issue when Library Dependency Finder (LDF) does not handle project `src_filter <http://docs.platformio.org/page/projectconf/section_env_build.html#src-filter>`__
+  (`issue #1905 <https://github.com/platformio/platformio-core/issues/1905>`_)
 
 3.6.1 (2018-10-29)
 ~~~~~~~~~~~~~~~~~~
diff --git a/platformio/builder/tools/piolib.py b/platformio/builder/tools/piolib.py
index 720f1eba..39627682 100644
--- a/platformio/builder/tools/piolib.py
+++ b/platformio/builder/tools/piolib.py
@@ -663,6 +663,12 @@ class PlatformIOLibBuilder(LibBuilderBase):
 
 class ProjectAsLibBuilder(LibBuilderBase):
 
+    def __init__(self, env, path, manifest=None, verbose=False):
+        # backup original value, will be reset in base.__init__
+        project_src_filter = env.get("SRC_FILTER")
+        super(ProjectAsLibBuilder, self).__init__(env, path)
+        self.env['SRC_FILTER'] = project_src_filter
+
     @property
     def include_dir(self):
         include_dir = self.env.subst("$PROJECTINCLUDE_DIR")
@@ -701,7 +707,8 @@ class ProjectAsLibBuilder(LibBuilderBase):
 
     @property
     def src_filter(self):
-        return self.env.get("SRC_FILTER", LibBuilderBase.src_filter.fget(self))
+        return (self.env.get("SRC_FILTER")
+                or LibBuilderBase.src_filter.fget(self))
 
     def process_extra_options(self):
         # skip for project, options are already processed