Configurations are now cached before action is called; performance

src/_premake_main.lua

@@ -146,6 +146,10 @@
 		
 			ok, err = premake.checkprojects()
 			if (not ok) then error("Error: " .. err, 0) end
+		else
+			for sln in premake.solution.each() do
+				premake.solution.bakeprojects(sln)
+			end
 		end
 			
 		

src/actions/vstudio/vs2005_solution.lua

@@ -7,6 +7,7 @@
 	premake.vstudio.sln2005 = { }
 	local vstudio = premake.vstudio
 	local sln2005 = premake.vstudio.sln2005
+	local solution = premake.solution
 	local project = premake5.project
 
 
@@ -87,7 +88,7 @@
 
 	function sln2005.solutionConfigurationPlatforms(sln)
 		-- eachconfig() requires a project object; any one will do
-		local prj = sln.projects[1]
+		local prj = solution.getproject_ng(sln, 1)
 
 		_p(1,'GlobalSection(SolutionConfigurationPlatforms) = preSolution')
 		for cfg in project.eachconfig(prj) do
@@ -105,7 +106,7 @@
 
 	function sln2005.projectConfigurationPlatforms(sln)
 		_p(1,'GlobalSection(ProjectConfigurationPlatforms) = postSolution')
-		for _, prj in ipairs(sln.projects) do
+		for prj in solution.eachproject_ng(sln) do
 			for cfg in project.eachconfig(prj) do				
 				local slnplatform = vstudio.platform(cfg)
 				local prjplatform = vstudio.projectplatform(cfg)

src/actions/vstudio/vs200x_vcproj.lua

@@ -740,7 +740,7 @@
 				end
 
 				depth = depth + 1
-				for cfg in project.eachconfig(prj, nil, node.cfg.fullpath) do
+				for cfg in project.eachconfig(prj) do
 					local hasconfig
 
 					local out = function(depth, msg, ...)

src/actions/vstudio/vs2010_vcxproj.lua

@@ -398,7 +398,7 @@
 			_p(1,'<ItemGroup>')
 			for _, file in ipairs(files) do
 				_x(2,'<ClCompile Include=\"%s\">', path.translate(file.fullpath))
-				for cfg in project.eachconfig(prj, nil, file.fullpath) do
+				for cfg in project.eachconfig(prj) do
 					if pchsource == file.fullpath and not cfg.flags.NoPCH then
 						_p(3,'<PrecompiledHeader %s>Create</PrecompiledHeader>', vc2010.condition(cfg))
 					end

src/base/solution.lua

@@ -41,6 +41,21 @@
 	end
 
 
+--
+-- Flattens the configurations of each of the projects in the solution
+-- and stores the results, which are then returned from subsequent
+-- calls to getproject().
+--
+
+	function solution.bakeprojects(sln)
+		for i = 1, #sln.projects do
+			local prj = solution.getproject_ng(sln, i)
+			sln.projects[i].rootcfg = prj
+			project.bakeconfigs(prj)
+		end
+	end
+
+
 --
 -- Iterate over the collection of solutions in a session.
 --
@@ -72,7 +87,7 @@
 		local i = 0
 		return function ()
 			i = i + 1
-			if (i <= #sln.projects) then
+			if i <= #sln.projects then
 				return premake.solution.getproject(sln, i)
 			end
 		end
@@ -92,7 +107,7 @@
 		local i = 0
 		return function ()
 			i = i + 1
-			if (i <= #sln.projects) then
+			if i <= #sln.projects then
 				return premake.solution.getproject_ng(sln, i)
 			end
 		end
@@ -185,9 +200,14 @@
 
 	function solution.getproject_ng(sln, idx)
 		local prj = sln.projects[idx]
-
-		local cfg = oven.merge({}, sln)
-		cfg = oven.merge(cfg, prj)
-		cfg = oven.merge(cfg, project.getconfig(prj))
-		return cfg
+		if prj.rootcfg then
+			-- cached version build by solution.bakeprojects()
+			return prj.rootcfg
+		else
+			-- "raw" version, accessible during scripting
+			local cfg = oven.merge({}, sln)
+			cfg = oven.merge(cfg, prj)
+			cfg = oven.merge(cfg, project.getconfig(prj))
+			return cfg
+		end
 	end

src/project/config.lua

@@ -333,7 +333,7 @@
 		-- times each obj dir gets used
 		local counts = {}
 		for sln in premake.solution.each() do
-			for _, prj in ipairs(sln.projects) do
+			for prj in premake.solution.eachproject_ng(sln) do
 				for testcfg in project.eachconfig(prj, "objdir") do
 					local dirs = getobjdirs(testcfg)
 					for _, dir in ipairs(dirs) do

src/project/project.lua

@@ -8,6 +8,23 @@
 	local project = premake5.project
 
 
+--
+-- Flattens the configurations of each of the configurations in the project
+-- and stores the results, which are then returned from subsequent calls
+-- to getconfig().
+--
+
+	function project.bakeconfigs(prj)
+		local configs = {}
+		configs["*"] = project.getconfig(prj)
+		for cfg in project.eachconfig(prj) do
+			local key = cfg.buildcfg .. (cfg.platform or "")
+			configs[key] = cfg
+		end
+		prj.configs = configs
+	end
+
+
 --
 -- Returns an iterator function for the configuration objects contained by
 -- the project. Each configuration corresponds to a build configuration/
@@ -64,7 +81,7 @@
 --
 
 	function project.eachfile(prj)
-		cfg = project.getconfig(prj, nil, nil, "files")
+		local cfg = project.getconfig(prj, nil, nil, "files")
 		local files = cfg.files
 		local i = 0
 		return function()
@@ -125,8 +142,14 @@
 -- @return
 --    A configuration object.
 --
-
+	
 	function project.getconfig(prj, buildcfg, platform, field, filename)
+		-- check for a cached version, build by bakeconfigs()
+		if not filename and prj.configs then
+			local key = (buildcfg or "*") .. (platform or "")
+			return prj.configs[key]
+		end
+		
 		local system
 		local architecture