Resolve #58 with handling assembly files

platformio/builder/main.py

@@ -48,7 +48,7 @@ commonvars.AddVariables(
 )
 
 DefaultEnvironment(
-    tools=["gcc", "g++", "ar", "gnulink", "platformio"],
+    tools=["gcc", "g++", "as", "ar", "gnulink", "platformio"],
     toolpath=[join("$PIOBUILDER_DIR", "tools")],
     variables=commonvars,
 

platformio/builder/scripts/atmelavr.py

@@ -26,6 +26,7 @@ env.Replace(
     ARFLAGS=["rcs"],
 
     ASFLAGS=[
+        "-c",
         "-g",  # include debugging info (so errors include line numbers)
         "-x", "assembler-with-cpp",
         "-mmcu=$BOARD_MCU"

platformio/builder/scripts/timsp430.py

@@ -25,6 +25,7 @@ env.Replace(
     ARFLAGS=["rcs"],
 
     ASFLAGS=[
+        "-c",
         "-g",  # include debugging info (so errors include line numbers)
         "-x", "-assembler-with-cpp",
         "-mmcu=$BOARD_MCU"

platformio/builder/scripts/titiva.py

@@ -24,6 +24,7 @@ env.Replace(
     ARFLAGS=["rcs"],
 
     ASFLAGS=[
+        "-c",
         "-g",  # include debugging info (so errors include line numbers)
         "-x", "assembler-with-cpp",
         "-Wall",