build(lib_install_dir): added lib_install_dir option

this option is useful for wheel builds

meson.build

@@ -18,7 +18,7 @@
 #   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 #
 # *********************************************************************** #
-project('libconstants', 'cpp', version: 'v1.1.3', default_options: ['cpp_std=c++23'], meson_version: '>=1.5.0')
+project('libconstants', 'cpp', version: 'v1.1.4', 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

@@ -1,3 +1,4 @@
 option('pkg_config', type: 'boolean', value: true, description: 'generate pkg-config file for libconstants (fourdst_constants.pc)')
 option('build_tests', type: 'boolean', value: true, description: 'control if tests are built or not')
 option('build_examples', type: 'boolean', value: true, description: 'control if examples is built or not')
+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/constants/meson.build

@@ -5,12 +5,14 @@ const_sources = files(
 
 
 # Define the libconst 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')
 libconst = library('const',
     const_sources, 
     include_directories: include_directories('include'),
     cpp_args: ['-fvisibility=default'],
     dependencies: [const_data_dep],
-    install : true)
+    install : true,
+    install_dir: fourdst_component_libdir)
 
 const_dep = declare_dependency(
     include_directories: include_directories('include'),