From 843aa16da63c8ad7e9307217296a7eaeb659c375 Mon Sep 17 00:00:00 2001
From: Ray Donnelly <mingw.android@gmail.com>
Date: Tue, 5 Dec 2017 22:47:59 +0000
Subject: [PATCH 16/16] Fix find_library so that it looks in sys.prefix/lib
 first

---
 Lib/ctypes/macholib/dyld.py |  4 ++++
 Lib/ctypes/util.py          | 45 +++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 45 insertions(+), 4 deletions(-)

diff --git a/Lib/ctypes/macholib/dyld.py b/Lib/ctypes/macholib/dyld.py
index c158e672f0..a4770ecf5c 100644
--- a/Lib/ctypes/macholib/dyld.py
+++ b/Lib/ctypes/macholib/dyld.py
@@ -88,6 +88,10 @@ def dyld_executable_path_search(name, executable_path=None):
     # If we haven't done any searching and found a library and the
     # dylib_name starts with "@executable_path/" then construct the
     # library name.
+    if not executable_path:
+        import sys
+        if sys.prefix:
+            executable_path = os.path.join(sys.prefix, 'bin')
     if name.startswith('@executable_path/') and executable_path is not None:
         yield os.path.join(executable_path, name[len('@executable_path/'):])
 
diff --git a/Lib/ctypes/util.py b/Lib/ctypes/util.py
index 7684eab81d..5cc5b1a455 100644
--- a/Lib/ctypes/util.py
+++ b/Lib/ctypes/util.py
@@ -80,7 +80,8 @@ if os.name == "ce":
 if os.name == "posix" and sys.platform == "darwin":
     from ctypes.macholib.dyld import dyld_find as _dyld_find
     def find_library(name):
-        possible = ['lib%s.dylib' % name,
+        possible = ['@executable_path/../lib/lib%s.dylib' % name,
+                    'lib%s.dylib' % name,
                     '%s.dylib' % name,
                     '%s.framework/%s' % (name, name)]
         for name in possible:
@@ -271,8 +272,8 @@ elif os.name == "posix":
             abi_type = mach_map.get(machine, 'libc6')
 
             # XXX assuming GLIBC's ldconfig (with option -p)
-            regex = os.fsencode(
-                '\s+(lib%s\.[^\s]+)\s+\(%s' % (re.escape(name), abi_type))
+            regex = r'\s+(lib%s\.[^\s]+)\s+\(%s'
+            regex = os.fsencode(regex % (re.escape(name), abi_type))
             try:
                 with subprocess.Popen(['/sbin/ldconfig', '-p'],
                                       stdin=subprocess.DEVNULL,
@@ -285,8 +286,44 @@ elif os.name == "posix":
             except OSError:
                 pass
 
+        def _findLib_ld(name):
+            # See issue #9998 for why this is needed
+            expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
+            cmd = ['ld', '-t']
+            libpath = os.environ.get('LD_LIBRARY_PATH')
+            if libpath:
+                for d in libpath.split(':'):
+                    cmd.extend(['-L', d])
+            cmd.extend(['-o', os.devnull, '-l%s' % name])
+            result = None
+            try:
+                p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
+                                     stderr=subprocess.PIPE,
+                                     universal_newlines=True)
+                out, _ = p.communicate()
+                res = re.search(expr, os.fsdecode(out))
+                if res:
+                    result = res.group(0)
+            except Exception as e:
+                pass  # result will be None
+            return result
+
+        def _findLib_prefix(name):
+            if not name:
+                return None
+            for fullname in (name, "lib%s.so" % (name)):
+                path = os.path.join(sys.prefix, 'lib', fullname)
+                if os.path.exists(path):
+                    return path
+            return None
+
         def find_library(name):
-            return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(name))
+            # See issue #9998
+            # Yes calling _findLib_prefix twice is deliberate, because _get_soname ditches
+            # the full path.
+            return _findLib_prefix(_get_soname(_findLib_prefix(name))) or \
+                   _findSoname_ldconfig(name) or \
+                   _get_soname(_findLib_gcc(name) or _findLib_ld(name))
 
 ################################################################
 # test code
-- 
2.14.3 (Apple Git-98)