cpu_arch more robust

Author: scivision

+stdlib/+native/cpu_arch.m

@@ -1,17 +1,21 @@
-%% CPU_ARCH get the CPU architecture
+%% CPU_ARCH get the Operating System CPU architecture
+%
+% This function retrieves the CPU architecture of the current operating system.
+% The physical CPU architecture can be obscured and even determining it in high-level
+% languages like Python is not exactly trivial.
+% This method is as used by
+% <https://cmake.org/cmake/help/latest/variable/CMAKE_HOST_SYSTEM_PROCESSOR.html CMake>.
 %
 %%% Outputs
-% * a: Returns the CPU architecture as a string.
-% * b: backend used
-
-function [a, b] = cpu_arch(backend)
-arguments
-  backend (1,:) string = ["java", "dotnet", "native"]
-end
+% * a: the CPU architecture as a character vector:
 
-o = stdlib.Backend(mfilename(), backend);
-a = o.func();
+function a = cpu_arch()
 
-b = o.backend;
+if ispc()
+  a = getenv("PROCESSOR_ARCHITECTURE");
+else
+  [~, a] = system('uname -m');
+  a = strip(a);
+end
 
 end