acts: add v15, embrace conditional variants (#27529)

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

@@ -39,6 +39,7 @@ class Acts(CMakePackage, CudaPackage):
     # Supported Acts versions
     version('main', branch='main')
     version('master', branch='main', deprecated=True)  # For compatibility
+    version('15.0.0', commit='0fef9e0831a90e946745390882aac871b211eaac', submodules=True)
     version('14.1.0', commit='e883ab6acfe5033509ad1c27e8e2ba980dfa59f6', submodules=True)
     version('14.0.0', commit='f902bef81b60133994315c13f7d32d60048c79d8', submodules=True)
     version('13.0.0', commit='ad05672e48b693fd37156f1ad62ed57aa82f858c', submodules=True)
@@ -110,31 +111,31 @@ class Acts(CMakePackage, CudaPackage):
     version('0.08.0', commit='99eedb38f305e3a1cd99d9b4473241b7cd641fa9')
 
     # Variants that affect the core Acts library
-    variant('benchmarks', default=False, description='Build the performance benchmarks')
+    variant('benchmarks', default=False, description='Build the performance benchmarks', when='@0.16:')
-    variant('examples', default=False, description='Build the examples')
+    variant('examples', default=False, description='Build the examples', when='@0.23: +digitization +fatras +identification +json +tgeo')
     variant('integration_tests', default=False, description='Build the integration tests')
     variant('unit_tests', default=False, description='Build the unit tests')
     variant('log_failure_threshold', default='MAX', description='Log level above which examples should auto-crash')
 
     # Variants that enable / disable Acts plugins
-    variant('autodiff', default=False, description='Build the auto-differentiation plugin')
+    variant('autodiff', default=False, description='Build the auto-differentiation plugin', when='@1.2:')
-    variant('dd4hep', default=False, description='Build the DD4hep plugin')
+    variant('dd4hep', default=False, description='Build the DD4hep plugin', when='+tgeo')
     variant('digitization', default=False, description='Build the geometric digitization plugin')
-    variant('fatras', default=False, description='Build the FAst TRAcking Simulation package')
+    variant('fatras', default=False, description='Build the FAst TRAcking Simulation package', when='@0.16:')
     variant('fatras_geant4', default=False, description='Build Geant4 Fatras package')
     variant('identification', default=False, description='Build the Identification plugin')
     variant('json', default=False, description='Build the Json plugin')
     variant('legacy', default=False, description='Build the Legacy package')
     # FIXME: Cannot build ONNX plugin as Spack doesn't have an ONNX runtime
     # FIXME: Cannot build SyCL plugin yet as Spack doesn't have SyCL support
-    variant('tgeo', default=False, description='Build the TGeo plugin')
+    variant('tgeo', default=False, description='Build the TGeo plugin', when='+identification')
-    variant('alignment', default=False, description='Build the alignment package')
+    variant('alignment', default=False, description='Build the alignment package', when='@13:')
 
     # Variants that only affect Acts examples for now
-    variant('geant4', default=False, description='Build the Geant4-based examples')
+    variant('geant4', default=False, description='Build the Geant4-based examples', when='@0.23: +examples')
-    variant('hepmc3', default=False, description='Build the HepMC3-based examples')
+    variant('hepmc3', default=False, description='Build the HepMC3-based examples', when='@0.23: +examples')
-    variant('pythia8', default=False, description='Build the Pythia8-based examples')
+    variant('pythia8', default=False, description='Build the Pythia8-based examples', when='@0.23: +examples')
-    variant('python', default=False, description='Build python bindings for the examples')
+    variant('python', default=False, description='Build python bindings for the examples', when='@14: +examples')
     variant('analysis', default=False, description='Build analysis applications in the examples')
 
     # Build dependencies
@@ -159,27 +160,7 @@ class Acts(CMakePackage, CudaPackage):
     depends_on('root @6.10: cxxstd=14', when='+tgeo @:0.8.0')
     depends_on('root @6.20: cxxstd=17', when='+tgeo @0.8.1:')
 
-    # Some variant combinations do not make sense
+    # ACTS has been using C++17 for a while, which precludes use of old GCC
-    conflicts('+autodiff', when='@:1.01')
-    conflicts('+benchmarks', when='@:0.15')
-    conflicts('+dd4hep', when='-tgeo')
-    conflicts('+examples', when='@:0.22')
-    conflicts('+examples', when='-digitization')
-    conflicts('+examples', when='-fatras')
-    conflicts('+examples', when='-identification')
-    conflicts('+examples', when='-json')
-    conflicts('+examples', when='-tgeo')
-    conflicts('+fatras', when='@:0.15')
-    conflicts('+geant4', when='@:0.22')
-    conflicts('+geant4', when='-examples')
-    conflicts('+hepmc3', when='@:0.22')
-    conflicts('+hepmc3', when='-examples')
-    conflicts('+pythia8', when='@:0.22')
-    conflicts('+pythia8', when='-examples')
-    conflicts('+python', when='@:13')
-    conflicts('+python', when='-examples')
-    conflicts('+tgeo', when='-identification')
-    conflicts('+alignment', when='@:12')
     conflicts('%gcc@:7', when='@0.23:')
 
     def cmake_args(self):