setting up meson build for pixell

meson.build

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+project(
+  'pixell',
+  'c', 'cpp', 'fortran',
+  meson_version: '>= 1.1.0',
+  default_options: [
+    'c_std=c99',
+  ],
+)
+
+c_compiler = meson.get_compiler('c')
+cpp_compiler = meson.get_compiler('cpp')
+add_languages('fortran', native: false)
+f_compiler = meson.get_compiler('fortran')
+system_os = host_machine.system()
+
+# Check compiler is recent enough (see "Toolchain Roadmap" for details)
+if system_os == 'windows'
+    error('Pixell does not support Windows')
+endif
+
+add_project_arguments(['-fopenmp', '-Wno-strict-aliasing', '-g', '-Ofast', '-fPIC'], language: ['c', 'cpp'])
+add_project_link_arguments(['-fopenmp', '-g', '-fPIC', '-fno-lto'], language: ['c', 'cpp'])
+add_project_arguments(['-O3', '-fPIC'], language: 'fortran')
+
+
+# https://mesonbuild.com/Python-module.html
+py_mod = import('python')
+# NOTE: with Meson >=0.64.0 we can add `pure: false` here and remove that line
+# everywhere else, see https://github.com/mesonbuild/meson/pull/10783.
+py3 = py_mod.find_installation()
+py3_dep = py3.dependency()
+
+subdir('pixell')

pyproject.toml

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+[build-system]
+requires = [
+    "cython >= 3.0.2",
+    "meson >= 1.1.0",
+    "meson-python >= 0.14.0", 
+    "versioneer[toml]"
+]
+build-backend = "mesonpy"
+
+[project]
+name = "pixell"
+dynamic = ["version"]
+description = "pixell"
+readme = "README.rst"
+license = "BSD license"
+maintainers = [
+    { name = "Simons Observatory Collaboration Analysis Library Task Force", email = "[email protected]" },
+]
+requires-python = ">=3.7,<3.12"
+dependencies = ["numpy>=1.20.0",
+                "astropy>=2.0",
+                "setuptools>=39",
+                "h5py>=2.7",
+                "scipy>=1.0",
+                "python_dateutil>=2.7",
+                "cython<3.0.4",
+                "healpy>=1.13",
+                "matplotlib>=2.0",
+                "pyyaml>=5.0",
+                "Pillow>=5.3.0",
+                "pytest-cov>=2.6",
+                "coveralls>=1.5",
+                "pytest>=4.6",
+                "ducc0>=0.33.0",
+                "numba>=0.54.0"]
+classifiers = [
+        'Development Status :: 2 - Pre-Alpha',
+        'Intended Audience :: Developers',
+        'License :: OSI Approved :: BSD License',
+        'Natural Language :: English',
+        "Programming Language :: Python :: 2",
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+]
+
+[project.optional-dependencies]
+test = ["pip>=9.0",
+        "bumpversion>=0.5",
+        "wheel>=0.30",
+        "watchdog>=0.8",
+        "flake8>=3.5",
+        "coverage>=4.5",
+        "Sphinx>=1.7",
+        "twine>=1.10",
+        "numpy>=1.20",
+        "astropy>=2.0",
+        "setuptools>=39.2",
+        "h5py>=2.7,<=2.10",
+        "scipy>=1.0",
+        "python_dateutil>=2.7",
+        "cython<3.0.4",
+        "matplotlib>=2.0",
+        "pyyaml>=5.0",
+        "pytest-cov>=2.6",
+        "coveralls>=1.5",
+        "pytest>=4.6"
+]
+
+[project.urls]
+"Documentation" = "https://pixell.readthedocs.io/en/latest/"
+"Source" = "https://github.com/simonsobs/pixell/"
+"Issue Tracker" = "https://github.com/simonsobs/pixell/issues"
+
+[tool.versioneer]
+VCS = "git"
+style = "pep440"
+versionfile_source = "pixell/_version.py"
+versionfile_build = "pixell/_version.py"
+tag_prefix = "v"
+parentdir_prefix = "pixell-"