[tools] add target os option to tools/generate_idefiles.py

Change-Id: I496a352376041718e09fda7edf8d68ebde0ac4ca
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/104562
Reviewed-by: Zach Anderson <[email protected]>
Commit-Queue: Daco Harkes <[email protected]>

Author: dcharkes

tools/generate_idefiles.py

@@ -50,7 +50,8 @@ def GenerateCompileCommands(options):
   if gn_result != 0:
     return gn_result
 
-  out_folder = utils.GetBuildRoot(HOST_OS, mode="debug", arch=options.arch)
+  out_folder = utils.GetBuildRoot(
+      HOST_OS, mode="debug", arch=options.arch, target_os=options.os)
 
   if not os.path.isdir(out_folder):
     return 1
@@ -140,6 +141,10 @@ def main(argv):
                       help="Target architecture for runtime sources.",
                       default="x64")
 
+  parser.add_argument("-s", "--os",
+                      help="Target operating system for runtime sources.",
+                      default=HOST_OS)
+
   options = parser.parse_args(argv[1:])
 
   return GenerateIdeFiles(options)