Add support for compiling with VS clang-cl toolset

methods.py

@@ -163,7 +163,7 @@ def add_source_files(self, sources, files, allow_gen=False):
 
 def disable_warnings(self):
     # 'self' is the environment
-    if self.msvc:
+    if self.msvc and not using_clang(self):
         # We have to remove existing warning level defines before appending /w,
         # otherwise we get: "warning D9025 : overriding '/W3' with '/w'"
         self["CCFLAGS"] = [x for x in self["CCFLAGS"] if not (x.startswith("/W") or x.startswith("/w"))]
@@ -817,21 +817,20 @@ def get_compiler_version(env):
         "apple_patch3": -1,
     }
 
-    if not env.msvc:
-        # Not using -dumpversion as some GCC distros only return major, and
-        # Clang used to return hardcoded 4.2.1: # https://reviews.llvm.org/D56803
-        try:
-            version = (
-                subprocess.check_output([env.subst(env["CXX"]), "--version"], shell=(os.name == "nt"))
-                .strip()
-                .decode("utf-8")
-            )
-        except (subprocess.CalledProcessError, OSError):
-            print_warning("Couldn't parse CXX environment variable to infer compiler version.")
-            return ret
-    else:
+    if env.msvc and not using_clang(env):
         # TODO: Implement for MSVC
         return ret
+
+    # Not using -dumpversion as some GCC distros only return major, and
+    # Clang used to return hardcoded 4.2.1: # https://reviews.llvm.org/D56803
+    try:
+        version = subprocess.check_output(
+            [env.subst(env["CXX"]), "--version"], shell=(os.name == "nt"), encoding="utf-8"
+        ).strip()
+    except (subprocess.CalledProcessError, OSError):
+        print_warning("Couldn't parse CXX environment variable to infer compiler version.")
+        return ret
+
     match = re.search(
         r"(?:(?<=version )|(?<=\) )|(?<=^))"
         r"(?P<major>\d+)"