build(lib_install_dir): added lib_install_dir option

This option overrides where reflect-cpp is installed. This is useful for wheel builds

build-config/reflect-cpp/meson.build

@@ -16,13 +16,15 @@ reflect_cpp_sources = files(
 
 reflect_cpp_include_dirs = include_directories('include')
 
-reflect_cpp_library = static_library(
-    'reflect_cpp',
-    reflect_cpp_sources,
-    include_directories: [reflect_cpp_include_dirs, tomlpp_inc_dir],
-    install: true,
-    install_dir: get_option('libdir') / 'fourdst' / 'vendor',
-)
+reflect_cpp_install_dir = get_option('lib_install_dir') != '' \
+    ? get_option('lib_install_dir') / 'vendor' \
+    : get_option('libdir') / 'fourdst' / 'vendor'
+
+reflect_cpp_library = static_library('reflect_cpp',
+                                     reflect_cpp_sources,
+                                     include_directories: [reflect_cpp_include_dirs, tomlpp_inc_dir],
+                                     install: true,
+                                     install_dir: reflect_cpp_install_dir)
 
 reflect_cpp_dep = declare_dependency(
     link_with: reflect_cpp_library,

meson_options.txt

@@ -1,3 +1,5 @@
 option('pkg_config', type: 'boolean', value: true, description: 'generate pkg-config file for libconfig (fourdst_config.pc)')
 option('build_tests', type: 'boolean', value: true, description: 'Build unit and integration tests (uses gtest)')
 option('build_examples', type: 'boolean', value: true, description: 'Build simple example 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.'):w
+