builtin: fix for Windows pipelines

var/spack/repos/builtin/packages/libtheora/package.py

@@ -88,7 +88,7 @@ def setup_build_environment(self, env):
         # devenv is needed to convert ancient MSbuild project to modern
         # msbuild project so MSBuild versions older than 2010 can build this
         # project
-        devenv_path = os.path.join(self.pkg.compiler.vs_root, "Common7", "IDE")
+        devenv_path = os.path.join(self.spec["msvc"].package.vs_root, "Common7", "IDE")
         env.prepend_path("PATH", devenv_path)
 
     @property

var/spack/repos/builtin/packages/msvc/package.py

@@ -143,6 +143,70 @@ def _standard_flag(self, *, language: str, standard: str) -> str:
         }
         return flags[language][standard]
 
+    @property
+    def short_msvc_version(self):
+        """This is the shorthand VCToolset version of form
+        MSVC<short-ver>
+        """
+        return "MSVC" + self.vc_toolset_ver
+
+    @property
+    def vc_toolset_ver(self):
+        """
+        The toolset version is the version of the combined set of cl and link
+        This typically relates directly to VS version i.e. VS 2022 is v143
+        VS 19 is v142, etc.
+        This value is defined by the first three digits of the major + minor
+        version of the VS toolset (143 for 14.3x.bbbbb). Traditionally the
+        minor version has remained a static two digit number for a VS release
+        series, however, as of VS22, this is no longer true, both
+        14.4x.bbbbb and 14.3x.bbbbb are considered valid VS22 VC toolset
+        versions due to a change in toolset minor version sentiment.
+
+        This is *NOT* the full version, for that see
+        Msvc.msvc_version or MSVC.platform_toolset_ver for the
+        raw platform toolset version
+
+        """
+        ver = self.msvc_version[:2].joined.string[:3]
+        return ver
+
+    @property
+    def msvc_version(self):
+        """This is the VCToolset version *NOT* the actual version of the cl compiler"""
+        return spack.version.Version(re.search(Msvc.compiler_version_regex, self.cc).group(1))
+
+    @property
+    def vs_root(self):
+        # The MSVC install root is located at a fix level above the compiler
+        # and is referenceable idiomatically via the pattern below
+        # this should be consistent accross versions
+        return os.path.abspath(os.path.join(self.cc, "../../../../../../../.."))
+
+    @property
+    def platform_toolset_ver(self):
+        """
+        This is the platform toolset version of current MSVC compiler
+        i.e. 142. The platform toolset is the targeted MSVC library/compiler
+        versions by compilation (this is different from the VC Toolset)
+
+
+        This is different from the VC toolset version as established
+        by `short_msvc_version`, but typically are represented by the same
+        three digit value
+        """
+        # Typically VS toolset version and platform toolset versions match
+        # VS22 introduces the first divergence of VS toolset version
+        # (144 for "recent" releases) and platform toolset version (143)
+        # so it needs additional handling until MS releases v144
+        # (assuming v144 is also for VS22)
+        # or adds better support for detection
+        # TODO: (johnwparent) Update this logic for the next platform toolset
+        # or VC toolset version update
+        toolset_ver = self.vc_toolset_ver
+        vs22_toolset = spack.version.Version(toolset_ver) > Version("142")
+        return toolset_ver if not vs22_toolset else "143"
+
 
 class CmdCall:
     """Compose a call to `cmd` for an ordered series of cmd commands/scripts"""