deactivate openmp for windowns/clang-cl

meson.build

@@ -18,22 +18,12 @@ projectnamespace = 'themachinethatgoesping'
 
 # --- dependencies ---
 
-# system
-# if meson.get_compiler('cpp').get_id() == 'clang-cl'
-#   #omp_dep = dependency('openmp')
-#   omp_dep = declare_dependency()
-# elif  meson.get_compiler('cpp').get_id() == 'clang'
-#   # libomp = meson.get_compiler('cpp').find_library('libomp5')
-#   # omp_dep = declare_dependency(
-#   # compile_args : ['-fopenmp'],
-#   # dependencies : [libomp]
-#   # )
-#   omp_dep = declare_dependency()
-# else
-#   omp_dep = dependency('openmp')
-# endif
-
-omp_dep = dependency('openmp')
+# openmp (not used in clang-cl / windows)
+if meson.get_compiler('cpp').get_id() == 'clang-cl'
+  omp_dep = declare_dependency()
+else
+  omp_dep = dependency('openmp')
+endif
 
 # extra compiler args when for the tools target
 tools_compile_args = ['-D_USE_MATH_DEFINES', '-fPIC']

src/tests/tutorial.test.cpp

@@ -9,7 +9,7 @@
 #include <iostream>
 #include <thread>
 
-#include <omp.h>
+#include <themachinethatgoesping/tools/helper/omp_helper.hpp>
 
 // using namespace testing;
 using namespace std;

src/themachinethatgoesping/tools/helper/.docstrings/omp_helper.doc.hpp

@@ -0,0 +1,53 @@
+//sourcehash: dde3ddcac5c985162f89b5211421b3158f063275d1d62c44b6407d304669c384
+
+/*
+  This file contains docstrings for use in the Python bindings.
+  Do not edit! They were automatically extracted by pybind11_mkdoc.
+
+  This is a modified version which allows for more than 8 arguments and includes def-guard
+ */
+
+#pragma once
+
+#ifndef __DOCSTRINGS_HPP__
+
+#define __EXPAND(x)                                                  x
+#define __COUNT(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, COUNT, ...) COUNT
+#define __VA_SIZE(...)                                               __EXPAND(__COUNT(__VA_ARGS__, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1))
+#define __CAT1(a, b)                                                 a##b
+#define __CAT2(a, b)                                                 __CAT1(a, b)
+#define __DOC1(n1)                                                   __doc_##n1
+#define __DOC2(n1, n2)                                               __doc_##n1##_##n2
+#define __DOC3(n1, n2, n3)                                           __doc_##n1##_##n2##_##n3
+#define __DOC4(n1, n2, n3, n4)                                       __doc_##n1##_##n2##_##n3##_##n4
+#define __DOC5(n1, n2, n3, n4, n5)                                   __doc_##n1##_##n2##_##n3##_##n4##_##n5
+#define __DOC6(n1, n2, n3, n4, n5, n6)                               __doc_##n1##_##n2##_##n3##_##n4##_##n5##_##n6
+#define __DOC7(n1, n2, n3, n4, n5, n6, n7)                           __doc_##n1##_##n2##_##n3##_##n4##_##n5##_##n6##_##n7
+#define __DOC8(n1, n2, n3, n4, n5, n6, n7, n8)                                                     \
+    __doc_##n1##_##n2##_##n3##_##n4##_##n5##_##n6##_##n7##_##n8
+#define __DOC9(n1, n2, n3, n4, n5, n6, n7, n8, n9)                                                 \
+    __doc_##n1##_##n2##_##n3##_##n4##_##n5##_##n6##_##n7##_##n8##_##n9
+#define __DOC10(n1, n2, n3, n4, n5, n6, n7, n8, n9, n10)                                           \
+    __doc_##n1##_##n2##_##n3##_##n4##_##n5##_##n6##_##n7##_##n8##_##n9##_##n10
+#define DOC(...) __EXPAND(__EXPAND(__CAT2(__DOC, __VA_SIZE(__VA_ARGS__)))(__VA_ARGS__))
+
+#endif // NEW_DOC_HEADER_HPP
+#if defined(__GNUG__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#endif
+
+
+static const char *__doc_omp_get_max_threads = R"doc()doc";
+
+static const char *__doc_omp_get_num_procs = R"doc()doc";
+
+static const char *__doc_omp_get_num_threads = R"doc()doc";
+
+static const char *__doc_omp_get_thread_num = R"doc()doc";
+
+#if defined(__GNUG__)
+#pragma GCC diagnostic pop
+#endif
+
+

src/themachinethatgoesping/tools/helper/omp_helper.hpp

@@ -0,0 +1,19 @@
+// SPDX-FileCopyrightText: 2024 Peter Urban, Ghent University
+//
+// SPDX-License-Identifier: MPL-2.0
+#pragma once
+
+/* generated doc strings */
+#include ".docstrings/omp_helper.doc.hpp"
+
+#if defined(_OPENMP)
+    // only include OpenMP header if it is defined
+    #include <omp.h>
+#else
+    // If OpenMP is not defined, provide fallback functions that simulate
+    // single-threaded behavior
+    inline int omp_get_num_threads() { return 1; }
+    inline int omp_get_max_threads() { return 1; }
+    inline int omp_get_thread_num() { return 0; }
+    inline int omp_get_num_procs() { return 1; }
+#endif

src/themachinethatgoesping/tools/meson.build

@@ -66,6 +66,7 @@ headers = [
   'helper/defaultsharedpointermap.hpp',
   'helper/enum.hpp',
   'helper/isviewstream.hpp',
+  'helper/omp_helper.hpp',
   'helper/.docstrings/defaultmap.doc.hpp',
   'helper/.docstrings/defaultsharedpointermap.doc.hpp',
   'helper/.docstrings/enum.doc.hpp',