fix(rpath): fixed macos RPATH bug'

src/constants/meson.build

@@ -4,14 +4,18 @@ const_sources = files(
 )
 
 
-# Define the libconst library so it can be linked against by other parts of the build system
+samedir_rpath = host_machine.system() == 'darwin' ? '@loader_path' : '$ORIGIN'
+
 libconst = library('const',
-    const_sources, 
+    const_sources,
     include_directories: include_directories('include'),
     cpp_args: ['-fvisibility=default'],
     dependencies: [const_data_dep],
     install : true,
-    install_dir: constants_libdir)
+    install_dir: constants_libdir,
+    install_rpath: samedir_rpath,
+    build_rpath: samedir_rpath
+)
 
 const_dep = declare_dependency(
     include_directories: include_directories('include'),
@@ -23,4 +27,8 @@ const_headers = files(
   'include/fourdst/constants/const.h'
 )
 
-install_headers(const_headers, install_dir: constants_header_install_dir)
+if get_option('build_python')
+    install_data(const_headers, install_dir: constants_header_install_dir)
+else
+    install_headers(const_headers, install_dir: constants_header_install_dir)
+endif