Dev compile for when M chip exists.

cython/cmisc_core.c

@@ -3,7 +3,14 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <string.h>
-#include <omp.h>
+
+#ifdef _NOOPENMP
+    typedef int omp_int_t;
+    inline omp_int_t omp_get_thread_num() { return 0;}
+    inline omp_int_t omp_get_max_threads() { return 1;}
+#else
+    #include <omp.h>
+#endif
 
 int min(int a, int b) { return a < b ? a : b; }
 int max(int a, int b) { return a > b ? a : b; }

cython/srcsim_core.c

@@ -36,7 +36,15 @@
 #include <string.h>
 #include <math.h>
 #include <sys/time.h>
-#include <omp.h>
+
+#ifdef _NOOPENMP
+    typedef int omp_int_t;
+    inline omp_int_t omp_get_thread_num() { return 0;}
+    inline omp_int_t omp_get_max_threads() { return 1;}
+#else
+    #include <omp.h>
+#endif
+
 #include "srcsim_core.h"
 
 // Precompute profile levels down to 1e-10 of the abspeak. Beyond that

meson.build

@@ -9,7 +9,8 @@ py = import('python').find_installation(pure: false)
 
 # Dependencies
 py_dep = py.dependency()
-omp_dep = dependency('openmp')
+# message('Machine', host_machine.system(), 'CPU type', host_machine.cpu_family())
+omp_dep = dependency('openmp', required : false)
 
 # Libraries
 cc = meson.get_compiler('c')
@@ -18,6 +19,15 @@ c_m_dep = cc.find_library('m', required: true)
 fc = meson.get_compiler('fortran')
 fortran_m_dep = fc.find_library('m', required: true)
 
+if not omp_dep.found() and host_machine.system() == 'darwin' and host_machine.cpu_family() == 'aarch64'
+    warning('It seems this is a Macbook with M type processor, moving forward without openmp.')
+    add_project_arguments(['-D_NOOPENMP','-Wno-error=incompatible-function-pointer-types'], language : ['c', 'cpp'])
+elif not omp_dep.found() and host_machine.system() != 'windows'
+    error('OpenMP is required but not found. Please install OpenMP libraries')
+elif host_machine.system() == 'windows'
+    error('Windows systems are not supported')
+endif
+
 # Directories
 library_install_dir = py.get_install_dir() / 'pixell'