[3.8] bpo-41976: Fix the fallback to gcc of ctypes.util.find_library when using gcc>9 (GH-22598). (GH-22600)

(cherry picked from commit 27ac19cca2c639caaf6fedf3632fe6beb265f24f)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>

1 files changed, 25 insertions, 7 deletions

diff --git a/Lib/ctypes/util.py b/Lib/ctypes/util.py
index 97973bc..0c2510e 100644
--- a/Lib/ctypes/util.py
+++ b/Lib/ctypes/util.py
@@ -93,6 +93,12 @@ elif os.name == "posix":
     # Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
     import re, tempfile
 
+    def _is_elf(filename):
+        "Return True if the given file is an ELF file"
+        elf_header = b'\x7fELF'
+        with open(filename, 'br') as thefile:
+            return thefile.read(4) == elf_header
+
     def _findLib_gcc(name):
         # Run GCC's linker with the -t (aka --trace) option and examine the
         # library name it prints out. The GCC command will fail because we
@@ -130,10 +136,17 @@ elif os.name == "posix":
                 # Raised if the file was already removed, which is the normal
                 # behaviour of GCC if linking fails
                 pass
-        res = re.search(expr, trace)
+        res = re.findall(expr, trace)
         if not res:
             return None
-        return os.fsdecode(res.group(0))
+
+        for file in res:
+            # Check if the given file is an elf file: gcc can report
+            # some files that are linker scripts and not actual
+            # shared objects. See bpo-41976 for more details
+            if not _is_elf(file):
+                continue
+            return os.fsdecode(file)
 
 
     if sys.platform == "sunos5":
@@ -299,17 +312,22 @@ elif os.name == "posix":
                                      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:
+                res = re.findall(expr, os.fsdecode(out))
+                for file in res:
+                    # Check if the given file is an elf file: gcc can report
+                    # some files that are linker scripts and not actual
+                    # shared objects. See bpo-41976 for more details
+                    if not _is_elf(file):
+                        continue
+                    return os.fsdecode(file)
+            except Exception:
                 pass  # result will be None
             return result
 
         def find_library(name):
             # See issue #9998
             return _findSoname_ldconfig(name) or \
-                   _get_soname(_findLib_gcc(name) or _findLib_ld(name))
+                   _get_soname(_findLib_gcc(name)) or _get_soname(_findLib_ld(name))
 
 ################################################################
 # test code