feat(msvs): add support for CL env var

pylib/gyp/generator/msvs.py

@@ -3440,6 +3440,25 @@ def _FinalizeMSBuildSettings(spec, configuration):
 
 
 def _GetValueFormattedForMSBuild(tool_name, name, value):
+    """
+    >>> PRODUCT_DIR_ABS = "PRODUCT_DIR_ABS"
+    >>> _GetValueFormattedForMSBuild(
+    ...     tool_name="tool_name", name="name", value=[]
+    ... )
+    ''
+    >>> _GetValueFormattedForMSBuild(
+    ...     tool_name="tool_name", name="name", value=["DelayLoadDLLs"]
+    ... )
+    'DelayLoadDLLs'
+    >>> _GetValueFormattedForMSBuild(
+    ...     tool_name="Lib", name="AdditionalOptions", value=["DelayLoadDLLs"]
+    ... )
+    'DelayLoadDLLs %(AdditionalOptions)'
+    >>> _GetValueFormattedForMSBuild(
+    ...     tool_name="ClCompile", name="AdditionalOptions", value=["DelayLoadDLLs"]
+    ... )
+    'DelayLoadDLLs %(AdditionalOptions)'
+    """
     if type(value) == list:
         # For some settings, VS2010 does not automatically extends the settings
         # TODO(jeanluc) Is this what we want?
@@ -3466,6 +3485,8 @@ def _GetValueFormattedForMSBuild(tool_name, name, value):
         formatted_value = char.join(
             [MSVSSettings.ConvertVCMacrosToMSBuild(i) for i in value]
         )
+        if tool_name == "ClCompile" and name == "AdditionalOptions":
+            formatted_value += os.environ.get("CL", "").replace("#", "=")
     else:
         formatted_value = MSVSSettings.ConvertVCMacrosToMSBuild(value)
     return formatted_value

pylib/gyp/msvs_emulation.py

@@ -1125,6 +1125,7 @@ def _ExtractImportantEnvironment(output_of_set):
         "systemroot",
         "temp",
         "tmp",
+        "cl",
     )
     env = {}
     # This occasionally happens and leads to misleading SYSTEMROOT error messages