internal/rosa: global preset flags

These changes preset behaviour globally. Useful for ad hoc workarounds for development or bootstrapping on resource-constrained systems.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/all.go

@@ -322,15 +322,29 @@ var (
 	}
 	// artifactsOnce is for lazy initialisation of artifacts.
 	artifactsOnce [_toolchainEnd][len(artifactsM)]sync.Once
+
+	// presetOpts globally modifies behaviour of presets.
+	presetOpts int
 )
 
+const (
+	// OptSkipCheck skips running all test suites.
+	OptSkipCheck = 1 << iota
+	// OptLLVMNoLTO disables LTO in all [LLVM] stages.
+	OptLLVMNoLTO
+)
+
+// Flags returns the current preset flags
+func Flags() int { return presetOpts }
+
 // zero zeros the value pointed to by p.
 func zero[T any](p *T) { var v T; *p = v }
 
 // DropCaches arranges for all cached [pkg.Artifact] to be freed some time after
 // it returns. Must not be used concurrently with any other function from this
 // package.
-func DropCaches() {
+func DropCaches(flags int) {
+	presetOpts = flags
 	zero(&artifacts)
 	zero(&artifactsOnce)
 }

internal/rosa/all_test.go

@@ -20,13 +20,16 @@ func TestLoad(t *testing.T) {
 }
 
 func BenchmarkAll(b *testing.B) {
+	flags := rosa.Flags()
+	b.Cleanup(func() { rosa.DropCaches(flags) })
+
 	for b.Loop() {
 		for i := range rosa.PresetEnd {
 			rosa.Std.Load(rosa.PArtifact(i))
 		}
 
 		b.StopTimer()
-		rosa.DropCaches()
+		rosa.DropCaches(0)
 		b.StartTimer()
 	}
 }

internal/rosa/cmake.go

@@ -185,7 +185,7 @@ func (attr *CMakeHelper) script(name string) string {
 	}
 
 	script := attr.Script
-	if !attr.SkipTest {
+	if !attr.SkipTest && presetOpts&OptSkipCheck == 0 {
 		script += "\n" + test
 	}
 

internal/rosa/llvm.go

@@ -90,10 +90,14 @@ func (t Toolchain) newLLVM() (pkg.Artifact, string) {
 			skipChecks[i] = s
 		}
 
-		cache = append(cache, []KV{
-			// very expensive
-			{"LLVM_ENABLE_LTO", "Thin"},
+		if presetOpts&OptLLVMNoLTO == 0 {
+			cache = append(cache, []KV{
+				// very expensive
+				{"LLVM_ENABLE_LTO", "Thin"},
+			}...)
+		}
 
+		cache = append(cache, []KV{
 			// symbols: clock_gettime, mallopt
 			{"COMPILER_RT_INCLUDE_TESTS", "OFF"},
 

internal/rosa/make.go

@@ -194,7 +194,7 @@ make \
 	}
 	scriptMake += "\n"
 
-	if !attr.SkipCheck {
+	if !attr.SkipCheck && presetOpts&OptSkipCheck == 0 {
 		scriptMake += attr.ScriptCheckEarly + `make \
 	` + jobsFlagE + ` \
 	`

internal/rosa/meson.go

@@ -117,7 +117,7 @@ func (attr *MesonHelper) script(name string) string {
 	}
 
 	var scriptTest string
-	if !attr.SkipTest {
+	if !attr.SkipTest && presetOpts&OptSkipCheck == 0 {
 		scriptTest = `
 meson test \
 	--print-errorlogs`

internal/rosa/rosa_test.go

@@ -93,11 +93,14 @@ func TestCureAll(t *testing.T) {
 }
 
 func BenchmarkStage3(b *testing.B) {
+	flags := rosa.Flags()
+	b.Cleanup(func() { rosa.DropCaches(flags) })
+
 	for b.Loop() {
 		rosa.Std.Load(rosa.LLVM)
 
 		b.StopTimer()
-		rosa.DropCaches()
+		rosa.DropCaches(0)
 		b.StartTimer()
 	}
 }