From 20fd6631b8678d5e64ded9c8c7e2d1ca0c345785 Mon Sep 17 00:00:00 2001
From: DWesl <22566757+DWesl@users.noreply.github.com>
Date: Sat, 30 Jul 2022 20:35:22 -0400
Subject: [PATCH] ENH: Don't add system library directories to rpath

Last of the patches from #73
Might close pypa/setuptools#3257

Dual purposes here:
- On platforms like Cygwin that don't have `rpath`, try to avoid adding things to `rpath`
- Some distribution binary package makers require that no shared library list a system library directory (`/lib`, `/lib64`, `/usr/lib`, `/usr/lib64`) in its `rpath`; this patch simplifies the code to ensure the shared library can find its dependencies at runtime.
---
 distutils/unixccompiler.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/distutils/unixccompiler.py b/distutils/unixccompiler.py
index 4be74fdf..7de39e96 100644
--- a/distutils/unixccompiler.py
+++ b/distutils/unixccompiler.py
@@ -139,6 +139,15 @@ class UnixCCompiler(CCompiler):
     if sys.platform == "cygwin":
         exe_extension = ".exe"
 
+    def _fix_lib_args(self, libraries, library_dirs, runtime_library_dirs):
+        """Remove standard library path from rpath"""
+        libraries, library_dirs, runtime_library_dirs = super()._fix_lib_args(
+            libraries, library_dirs, runtime_library_dirs)
+        libdir = sysconfig.get_config_var('LIBDIR')
+        if runtime_library_dirs and (libdir in runtime_library_dirs):
+            runtime_library_dirs.remove(libdir)
+        return libraries, library_dirs, runtime_library_dirs
+  
     def preprocess(
         self,
         source,