Try and Windows-ize paths in build.py

Author: earlephilhower

tools/build.py

@@ -29,6 +29,15 @@
 import tempfile
 import shutil
 
+
+def windowsize_paths(l):
+    out = []
+    for i in l:
+        if i.startswith('/'):
+            i = 'C:' + i
+        out += [i.replace('/', '\\')]
+    return out
+
 def compile(tmp_dir, sketch, cache, tools_dir, hardware_dir, ide_path, f, args):
     cmd = []
     cmd += [ide_path + '/arduino-builder']
@@ -65,6 +74,9 @@ def compile(tmp_dir, sketch, cache, tools_dir, hardware_dir, ide_path, f, args):
         cmd += ['-verbose']
     cmd += [sketch]
 
+    if platform.system() == "Windows":
+        cmd = windowsize_paths(cmd)
+
     if args.verbose:
         print('Building: ' + " ".join(cmd), file=f)