Add validation for toolset.

src/base/action.lua

@@ -257,6 +257,45 @@
 		return false
 	end
 
+---
+-- Determines if an action supports a particular toolset.
+--
+-- @param language
+--    The language that toolset belongs.
+-- @param toolset
+--    The toolset to check.
+-- @returns
+--    True if the toolset is supported, false otherwise.
+---
+	function action.supportsToolset(language, toolset)
+		if not language or not toolset then
+			return true
+		end
+		local self = action.current()
+		if not self then
+			return false
+		end
+		local language_keys_map = {
+			["C"] = "cc",
+			["C++"] = "cc",
+			["C#"] = "dotnet",
+			["D"] = "dc",
+		}
+		local language_key = language_keys_map[language]
+		if not language_key then
+			p.warn("Unknown mapping for language %s", language)
+			return true
+		end
+		if not self.valid_tools then
+			return true
+		end
+		local valid_tools = self.valid_tools[language_key]
+		if not valid_tools then
+			return true
+		end
+
+		return table.contains(valid_tools, toolset)
+	end
 
 --
 -- Determines if an action supports a particular configuration.

src/base/validation.lua

@@ -56,6 +56,7 @@
 		return {
 			m.projectHasLanguage,
 			m.actionSupportsLanguage,
+			m.actionSupportsToolset,
 			m.actionSupportsKind,
 			m.projectRulesExist,
 			m.projectValuesInScope,
@@ -174,6 +175,13 @@
 	end
 
 
+	function m.actionSupportsToolset(prj)
+		if not p.action.supportsToolset(prj.language, prj.toolset) then
+			p.warn("Unsupported toolset '%s' used for language '%s' for project '%s'", prj.toolset, prj.language, prj.name)
+		end
+	end
+
+
 	function m.configHasKind(cfg)
 		if not cfg.kind then
 			p.error("Project '%s' needs a kind in configuration '%s'", cfg.project.name, cfg.name)