Detect soname clashes

The same library may be present in the same build tree, eg.
libtfpsacrypto.so, which gets copied from the tf-psa-crypto/core/ to
library/ during an Mbed TLS build.

Make sure that the duplicated libraries are byte-for-byte identical,
otherwise abort the test.

Signed-off-by: Bence Szépkúti <[email protected]>

Author: bensze01

scripts/mbedtls_framework/abi_check.py

@@ -96,6 +96,7 @@
 import argparse
 import logging
 import tempfile
+import filecmp
 import fnmatch
 from types import SimpleNamespace
 
@@ -237,9 +238,10 @@ def _build_shared_libraries(self, git_worktree_path, version):
         self.log.debug(build_output.decode("utf-8"))
         for root, _dirs, files in os.walk(build_dir):
             for file in fnmatch.filter(files, "*.so"):
-                version.modules[os.path.splitext(file)[0]] = (
-                    os.path.join(root, file)
-                )
+                new_path = os.path.join(root, file)
+                path = version.modules.setdefault(os.path.splitext(file)[0], new_path)
+                if path != new_path and not filecmp.cmp(path, new_path, False):
+                    raise Exception(f"The following libraries differ, but have the same soname:\n{path}\n{new_path}")
 
     @staticmethod
     def _pretty_revision(version):