build(meson): more robust python version building

Doxyfile

@@ -48,7 +48,7 @@ PROJECT_NAME           = fourdst::libcomposition
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = v2.4.5
+PROJECT_NUMBER         = v2.4.6
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewers a

meson.build

@@ -18,13 +18,31 @@
 #   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 #
 # *********************************************************************** #
-project('libcomposition', 'cpp', version: 'v2.4.5', default_options: ['cpp_std=c++23'], meson_version: '>=1.5.0')
+project('libcomposition', 'cpp', version: 'v2.4.6', default_options: ['cpp_std=c++23'], meson_version: '>=1.5.0')
 
 # Add default visibility for all C++ targets
 add_project_arguments('-fvisibility=default', language: 'cpp')
 # Disable shadow warnings
 add_project_arguments('-Wno-shadow', language: 'cpp')
 
+if get_option('build_python')
+    local_py_install = import('python').find_installation('python3', pure: false)
+    fourdst_pkg = local_py_install.get_install_dir() / 'fourdst'
+
+    composition_libdir             = fourdst_pkg / 'lib'
+    composition_header_install_dir = fourdst_pkg / 'include' / 'fourdst' / 'composition'
+
+    vendor_lib_dir             = fourdst_pkg / 'lib' / 'vendor'
+    vendor_header_dir          = fourdst_pkg / 'include' / 'fourdst' / 'vendor'
+    message('Installing libcomposition in python mode. Install locations are...')
+else
+    composition_libdir             = get_option('libdir')
+    composition_header_install_dir = get_option('includedir') / 'fourdst' / 'composition'
+    message('Installing libcomposition in non python (normal) mode. Install locations are...')
+endif
+message('    Libraries: ' + composition_libdir)
+message('    Headers:   ' + composition_header_install_dir)
+
 cpp = meson.get_compiler('cpp')
 subdir('build-config')
 

meson_options.txt

@@ -2,5 +2,4 @@ option('pkg_config', type: 'boolean', value: true, description: 'generate pkg-co
 option('build_tests', type: 'boolean', value: true, description: 'build unit tests (uses gtest)')
 option('build_examples', type: 'boolean', value: true, description: 'build example programs')
 option('build_benchmarks', type: 'boolean', value: false, description: 'build benchmark programs')
-option('lib_install_dir', type: 'string', value: '', description: 'Override install dir for the shared library (used by the fourdst umbrella to place libs inside the Python package in wheel builds). Empty = default libdir.')
-option('header_install_dir', type: 'string', value: '', description: 'Override the header install root (used by the fourdst umbrella to place headers inside the Python package in wheel builds). Empty = default includedir.')
+option('build_python', type: 'boolean', value: false, description: 'Build in python mode. Note that this does not generate a wheel; rather, this is the appropriate option to turn on when packaging this component inside of a wheel.')

src/composition/meson.build

@@ -37,14 +37,13 @@ dependencies = [
     xxhash_dep
 ]
 
-fourdst_component_libdir = get_option('lib_install_dir') != '' ? get_option('lib_install_dir') : get_option('libdir')
-
 libcomposition = library('composition',
-                         composition_sources,
-                         cpp_args: ['-fvisibility=default'],
-                         dependencies: dependencies,
-                         install: true,
-                         install_dir: fourdst_component_libdir)
+    composition_sources,
+    cpp_args: ['-fvisibility=default'],
+    dependencies: dependencies,
+    install: true,
+    install_dir: composition_libdir
+)
 
 
 composition_dep = declare_dependency(
@@ -53,10 +52,6 @@ composition_dep = declare_dependency(
     sources: composition_sources,
 )
 
-composition_header_install_dir = get_option('header_install_dir') != '' \
-    ? get_option('header_install_dir') / 'fourdst' / 'composition' \
-    : get_option('includedir') / 'fourdst' / 'composition'
-
 # Make headers accessible
 composition_headers = files(
   'include/fourdst/composition/composition.h',