build(lib_install_dir): added lib_install_dir option

this is useful for wheel builds

meson.build

@@ -18,7 +18,7 @@
 #   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 #
 # *********************************************************************** #
-project('libcomposition', 'cpp', version: 'v2.4.3', default_options: ['cpp_std=c++23'], meson_version: '>=1.5.0')
+project('libcomposition', 'cpp', version: 'v2.4.4', 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')

meson_options.txt

@@ -2,3 +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.')

src/composition/meson.build

@@ -37,12 +37,15 @@ dependencies = [
     xxhash_dep
 ]
 
-# Define the libcomposition library so it can be linked against by other parts of the build system
+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)
+                         composition_sources,
+                         cpp_args: ['-fvisibility=default'],
+                         dependencies: dependencies,
+                         install: true,
+                         install_dir: fourdst_component_libdir)
+
 
 composition_dep = declare_dependency(
     link_with: libcomposition,