musl-find_library.patch

diff -ru Python-2.7.12.orig/Lib/ctypes/util.py Python-2.7.12/Lib/ctypes/util.py
--- Python-2.7.12.orig/Lib/ctypes/util.py	2016-06-26 00:49:30.000000000 +0300
+++ Python-2.7.12/Lib/ctypes/util.py	2016-11-03 16:05:46.954665040 +0200
@@ -204,6 +204,41 @@
         def find_library(name, is64 = False):
             return _get_soname(_findLib_crle(name, is64) or _findLib_gcc(name))
 
+    elif True:
+
+        # Patched for Alpine Linux / musl - search manually system paths
+        def _is_elf(filepath):
+            try:
+                with open(filepath, 'rb') as fh:
+                    return fh.read(4) == b'\x7fELF'
+            except:
+                return False
+
+        def find_library(name):
+            from glob import glob
+            # absolute name?
+            if os.path.isabs(name):
+                return name
+            # special case for libm, libcrypt and libpthread and musl
+            if name in ['m', 'crypt', 'pthread']:
+                name = 'c'
+            elif name in ['libm.so', 'libcrypt.so', 'libpthread.so']:
+                name = 'libc.so'
+            # search in standard locations (musl order)
+            paths = ['/lib', '/usr/local/lib', '/usr/lib']
+            if 'LD_LIBRARY_PATH' in os.environ:
+                paths = os.environ['LD_LIBRARY_PATH'].split(':') + paths
+            for d in paths:
+                f = os.path.join(d, name)
+                if _is_elf(f):
+                    return os.path.basename(f)
+
+                prefix = os.path.join(d, 'lib'+name)
+                for suffix in ['.so', '.so.*']:
+                    for f in glob('{0}{1}'.format(prefix, suffix)):
+                        if _is_elf(f):
+                            return os.path.basename(f)
+
     else:
 
         def _findSoname_ldconfig(name):