Avoid problem with long command for "gcc-ar" under Windows

platformio/builder/main.py

@@ -52,7 +52,7 @@ commonvars.AddVariables(
 DefaultEnvironment(
     tools=[
         "gcc", "g++", "as", "ar", "gnulink",
-        "platformio", "upload"
+        "platformio", "pioupload", "pioar"
     ],
     toolpath=[join("$PIOBUILDER_DIR", "tools")],
     variables=commonvars,

platformio/builder/scripts/atmelavr.py

@@ -30,6 +30,7 @@ def BeforeUpload(target, source, env):  # pylint: disable=W0613,W0621
 
     env.AutodetectUploadPort()
     env.Append(UPLOADERFLAGS=["-P", "$UPLOAD_PORT"])
+
     if env.subst("$BOARD") == "raspduino":
         _rpi_sysgpio("/sys/class/gpio/export", 18)
         _rpi_sysgpio("/sys/class/gpio/gpio18/direction", "out")

platformio/builder/tools/pioar.py

@@ -0,0 +1,35 @@
+# Copyright (C) Ivan Kravets <me@ikravets.com>
+# See LICENSE for details.
+
+import atexit
+from os import remove
+from tempfile import mkstemp
+
+MAX_SOURCES_LENGTH = 8000  # Windows CLI has limit with command length to 8192
+
+
+def _huge_sources_hook(sources):
+    if len(str(sources)) < MAX_SOURCES_LENGTH:
+        return sources
+
+    _, tmp_file = mkstemp()
+    with open(tmp_file, "w") as f:
+        f.write(str(sources).replace("\\", "/"))
+
+    atexit.register(remove, tmp_file)
+
+    return "@%s" % tmp_file
+
+
+def exists(_):
+    return True
+
+
+def generate(env):
+
+    env.Replace(
+        _huge_sources_hook=_huge_sources_hook,
+        ARCOM=env.get("ARCOM", "").replace(
+            "$SOURCES", "${_huge_sources_hook(SOURCES)}"))
+
+    return env