GPU: add the metalOverrideSourceBuildFlags setting

Mirrors oclOverrideSourceBuildFlags for the Metal backend.

Author: ktf

GPU/GPUTracking/Definitions/GPUSettingsList.h

@@ -406,6 +406,7 @@ AddOption(tpcWriteClustersAfterRejection, bool, false, "", 0, "Apply TPC rejecti
 AddOption(oclPlatformNum, int32_t, -1, "", 0, "Platform to use, in case the backend provides multiple platforms (OpenCL only, -1 = auto-select, -2 query all platforms (also incompatible))")
 AddOption(oclCompileFromSources, bool, false, "", 0, "Compile OpenCL binary from included source code instead of using included spirv code")
 AddOption(oclOverrideSourceBuildFlags, std::string, "", "", 0, "Override OCL build flags for compilation from source, put a space for empty options")
+AddOption(metalOverrideSourceBuildFlags, std::string, "", "", 0, "Override Metal build flags for compilation from source, put a space for empty options")
 AddOption(hipOverrideAMDEUSperCU, int32_t, -1, "", 0, "Override AMD_EUS_PER_CU setting")
 AddOption(printSettings, bool, false, "", 0, "Print all settings when initializing")
 AddOption(tpcFreeAllocatedMemoryAfterProcessing, bool, false, "", 0, "Clean all memory allocated by TPC when TPC processing done, only data written to external output resources will remain")
@@ -670,7 +671,7 @@ AddOption(constBz, bool, false, "", 0, "force constant Bz for tests")
 AddOption(setMaxTimeBin, int32_t, -2, "", 0, "maximum time bin of continuous data, 0 for triggered events, -1 for automatic continuous mode, -2 for automatic continuous / triggered")
 AddOption(overrideNHbfPerTF, int32_t, 0, "", 0, "Overrides the number of HBF per TF if != 0")
 AddOption(overrideTPCTimeBinCur, int32_t, 0, "", 0, "Overrides TPC time bin cut if > 0")
-AddOption(deviceType, std::string, "CPU", "", 0, "Device type, CPU | CUDA | HIP | OCL")
+AddOption(deviceType, std::string, "CPU", "", 0, "Device type, CPU | CUDA | HIP | OCL | METAL")
 AddOption(forceDeviceType, bool, true, "", 0, "force device type, otherwise allows fall-back to CPU")
 AddOption(synchronousProcessing, bool, false, "", 0, "Apply performance shortcuts for synchronous processing, disable unneeded steps")
 AddOption(dump, int32_t, 0, "", 0, "Dump events for standalone benchmark: 1 = dump events, 2 = dump events and skip processing in workflow")