sets the windows build environment globally

Author: kdschlosser

builder/__init__.py

@@ -4,6 +4,43 @@
 import threading
 import random
 
+_windows_env = None
+
+def setup_windows_build():
+
+    global _windows_env
+
+    if _windows_env is None:
+        import pyMSVC
+
+        env = pyMSVC.setup_environment()
+        print(env)
+
+        for key in os.environ.keys():
+            if 'COMNTOOLS' in key:
+                version = key.replace('COMNTOOLS', '').replace('VS', '')
+                break
+        else:
+            print(os.environ)
+            raise RuntimeError('unable to locate common tools version')
+
+        version = 'v' + version
+
+        msbuild_path = env.visual_c.msbuild_path.lower()
+        msbuild_path = msbuild_path.split('msbuild', 1)[0][:-1]
+
+        VCTargetsPath = os.path.join(
+            msbuild_path,
+            'Msbuild',
+            'Microsoft',
+            'VC',
+            version
+            )
+        os.environ['VCTargetsPath'] = VCTargetsPath + '\\'
+
+        _windows_env = env
+
+    return _windows_env
 
 def update_mphalport(target):
     if target == 'esp8266':

builder/windows.py

@@ -4,6 +4,7 @@
 from . import spawn
 from . import generate_manifest
 from . import update_mphalport
+from . import setup_windows_build
 
 
 mpy_cross_cmd = []
@@ -53,26 +54,8 @@ def build_commands(_, extra_args, script_dir, lv_cflags, board):
         LV_CFLAGS = lv_cflags
 
     if sys.platform.startswith('win'):
-        import pyMSVC
+        env = setup_windows_build()
 
-        env = pyMSVC.setup_environment()
-        print(env)
-
-        for key in os.environ.keys():
-            if 'COMNTOOLS' in key:
-                version = key.replace('COMNTOOLS', '').replace('VS', '')
-                break
-        else:
-            print(os.environ)
-            raise RuntimeError('unable to locate common tools version')
-
-        version = 'v' + version
-
-        msbuild_path = env.visual_c.msbuild_path.lower()
-        msbuild_path = msbuild_path.split('msbuild', 1)[0][:-1]
-
-        VCTargetsPath = os.path.join(msbuild_path, 'Msbuild', 'Microsoft', 'VC', version)
-        os.environ['VCTargetsPath'] = VCTargetsPath + '\\'
         mpy_cross_cmd.extend([
             f'"{env.visual_c.msbuild_path}"',
             'lib/micropython/mpy-cross/mpy-cross.vcxproj'

make.py

@@ -170,7 +170,14 @@ def create_lvgl_header():
             f'#include "{SCRIPT_DIR}/ext_mod/lvgl_addons/include/color_addons.h"\n'
         )
 
+
 if __name__ == '__main__':
+
+    if sys.platform.startswith('win'):
+        from builder import setup_windows_build
+
+        setup_windows_build()
+
     if target.lower() == 'esp32':
         from builder import esp32 as mod
     elif target.lower() == 'unix':