Fix build on Windows

* drop dependency search for OpenMP (unnecessary) and drop libomp-dev from standard clang builds
* use CMake to find MKL

Author: ndgrigorian

.github/workflows/build-with-standard-clang.yml

@@ -33,7 +33,6 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install -y clang
-          sudo apt-get install -y libomp-dev
 
       - name: Setup Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0

meson.build

@@ -72,34 +72,16 @@ else
     error('Unsupported system.')
 endif
 
-# dependencies
-omp_dep = dependency('openmp', required: true)
-
-# manually waterfall the meson deps: pkg-config to cmake to find_library
-mkl_dep = dependency('mkl-dynamic-lp64-iomp', required: false)
-
-if not mkl_dep.found()
-    mkl_dep = dependency('MKL', method: 'cmake',
-        modules: ['MKL::MKL'],
-        cmake_args: [
-            '-DMKL_ARCH=intel64',
-            '-DMKL_LINK=dynamic',
-            '-DMKL_THREADING=intel_thread',
-            '-DMKL_INTERFACE=lp64'
-        ],
-        required: false
-    )
-endif
-
-if not mkl_dep.found()
-    # use static: false to emulate -DMKL_LINK=dynamic
-    # static: false docs are wrong, this will only consider shared libs
-    # see: https://github.com/mesonbuild/meson/issues/14163
-    mkl_core = cc.find_library('mkl_core', required: true, static: false)
-    mkl_intel_lp64 = cc.find_library('mkl_intel_lp64', required: true, static: false)
-    mkl_intel_thread = cc.find_library('mkl_intel_thread', required: true, static: false)
-    mkl_dep = declare_dependency(dependencies: [mkl_core, mkl_intel_lp64, mkl_intel_thread])
-endif
+mkl_dep = dependency('MKL', method: 'cmake',
+    modules: ['MKL::MKL'],
+    cmake_args: [
+        '-DMKL_ARCH=intel64',
+        '-DMKL_LINK=dynamic',
+        '-DMKL_THREADING=intel_thread',
+        '-DMKL_INTERFACE=lp64'
+    ],
+    required: false
+)
 
 # generate loops, similar to numpy
 src_file_cli = find_program('_vendored/process_src_template.py')