Do stat with re-try on native test module binary.

Author: fangerer

graalpython/com.oracle.graal.python.test/src/tests/cpyext/__init__.py

@@ -70,6 +70,14 @@ def setUp(self):
 def ccompile(self, name):
     from distutils.core import setup, Extension
     source_file = '%s/%s.c' % (__dir__, name)
+
+    try:
+        stat_result = os.stat(source_file)
+        if stat_result[6] == 0:
+            raise SystemError("empty source file %s" % (source_file,))
+    except FileNotFoundError:
+        raise SystemError("source file %s not available" % (source_file,))
+
     module = Extension(name, sources=[source_file])
     args = ['--quiet', 'build', 'install_lib', '-f', '--install-dir=%s' % __dir__]
     setup(
@@ -81,12 +89,25 @@ def ccompile(self, name):
         ext_modules=[module]
     )
     # ensure file was really written
+    binary_file_llvm = '%s/%s.bc' % (__dir__, name)
+    binary_file_gcc = '%s/%s.so' % (__dir__, name)
+
+    tries = 0
+    while tries < 3 and not file_not_empty(binary_file_llvm) and not file_not_empty(binary_file_gcc):
+        tries += 1
+
+    if tries >= 3:
+        raise SystemError("binary file %s/%s.(bc|so) not available" % (__dir__, name))
+
+
+def file_not_empty(path):
     try:
-        stat_result = os.stat(source_file)
+        stat_result = os.stat(path)
         if stat_result[6] == 0:
-            raise SystemError("empty source file %s" % (source_file,))
+            return False
     except FileNotFoundError:
-        raise SystemError("source file %s not available" % (source_file,))
+        return False
+    return True
 
 
 c_template = """
@@ -502,11 +523,21 @@ def CPyExtType(name, code, **kwargs):
     kwargs.setdefault("ready_code", "")
     c_source = UnseenFormatter().format(template, **kwargs)
 
-    with open("%s/%s.c" % (__dir__, name), "wb", buffering=0) as f:
+    source_file = "%s/%s.c" % (__dir__, name)
+    with open(source_file, "wb", buffering=0) as f:
         if GRAALPYTHON:
             f.write(c_source)
         else:
             f.write(bytes(c_source, 'utf-8'))
+
+    # ensure file was really written
+    try:
+        stat_result = os.stat(source_file)
+        if stat_result[6] == 0:
+            raise SystemError("empty source file %s" % (source_file,))
+    except FileNotFoundError:
+        raise SystemError("source file %s not available" % (source_file,))
+
     ccompile(None, name)
     sys.path.insert(0, __dir__)
     try: