internal/rosa/cmake: optional variant string

This improves consistency with other helpers and removes the usually unnecessary variant suffix.

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

internal/rosa/cmake.go

@@ -42,6 +42,9 @@ func init() { artifactsF[CMake] = Toolchain.newCMake }
 // CMakeAttr holds the project-specific attributes that will be applied to a new
 // [pkg.Artifact] compiled via [CMake].
 type CMakeAttr struct {
+	// Joined with name with a dash if non-empty.
+	Variant string
+
 	// Path elements joined with source.
 	Append []string
 	// Use source tree as scratch space.
@@ -69,12 +72,12 @@ type CMakeAttr struct {
 
 // NewViaCMake returns a [pkg.Artifact] for compiling and installing via [CMake].
 func (t Toolchain) NewViaCMake(
-	name, version, variant string,
+	name, version string,
 	source pkg.Artifact,
 	attr *CMakeAttr,
 	extra ...pkg.Artifact,
 ) pkg.Artifact {
-	if name == "" || version == "" || variant == "" {
+	if name == "" || version == "" {
 		panic("names must be non-empty")
 	}
 	if attr == nil {
@@ -98,8 +101,13 @@ func (t Toolchain) NewViaCMake(
 		prefix = AbsSystem
 	}
 
+	rname := name
+	if attr.Variant != "" {
+		rname += "-" + attr.Variant
+	}
+
 	sourcePath := AbsUsrSrc.Append(name)
-	return t.New(name+"-"+variant+"-"+version, attr.Flag, stage0Concat(t, extra,
+	return t.New(rname+"-"+version, attr.Flag, stage0Concat(t, extra,
 		t.Load(CMake),
 		t.Load(Ninja),
 	), nil, slices.Concat([]string{