Use python pkgconf to find cysignals in example

Author: tobiasdiez

example/meson.build

@@ -2,18 +2,7 @@ project('cysignals_example', 'cython', 'cpp')
 
 py = import('python').find_installation()
 
-inc_cysignals = run_command(
-  py,
-  [
-    '-c',
-    '''
-import cysignals
-print(cysignals.__file__.replace('__init__.py', ''))
-    '''.strip(),
-  ],
-  check: true,
-).stdout().strip()
-cysignals = declare_dependency(include_directories: inc_cysignals)
+cysignals = dependency('cysignals')
 
 py.extension_module('cysignals_example',
   sources: ['cysignals_example.pyx'],

example/pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["meson-python", "cython>=0.28"]
+requires = ["meson-python", "cython>=0.28", "pkgconf"]
 build-backend = "mesonpy"
 
 [project]

pyproject.toml

@@ -32,6 +32,9 @@ classifiers = [
 urls = { Homepage = "https://github.com/sagemath/cysignals" }
 requires-python = ">=3.9,<3.14"
 
+[project.entry-points.pkg_config]
+cysignals = 'cysignals'
+
 [tool.pytest.ini_options]
 addopts = "--doctest-modules --import-mode importlib"
 testpaths = "src tests"
@@ -44,6 +47,7 @@ dev = [
     "meson>=1.9.0",
     "meson-python>=0.18.0",
     "ninja>=1.13.0",
+    "pkgconf>=2.4.3.post2",
     "pytest>=8.4.2",
 ]
 

src/cysignals/cysignals.pc

@@ -0,0 +1,6 @@
+includedir=${pcfiledir}
+
+Name: cysignals
+Description: cysignals library
+Version: 1.0.0
+Cflags: -I${includedir}

src/cysignals/meson.build

@@ -2,6 +2,7 @@ configure_file(output: 'cysignals_config.h', configuration: config, install_dir:
 
 py.install_sources(
     '__init__.py',
+    'cysignals.pc',
     'cysignals-CSI-helper.py',
     'memory.pxd',
     'pysignals.pxd',