liblog: audit declare LIBLOG_ABI_PUBLIC
- replace <sys/cdefs.h> with local "log_cdefs.h" which
fortifies and expands definitions, adding LIBLOG_ABI_PUBLIC,
LIBLOG_HIDDEN, LIBLOG_ABI_PRIVATE and LIBLOG_WEAK.
- clearly tag each interface as LIBLOG_ABI_PUBLIC, LIBLOG_HIDDEN,
LIBLOG_ABI_PRIVATE, LIBLOG_WEAK or static depending on scope
- Add -fvisibility=hidden to ensure nothing else leaks
- some code standard adjustments
Bug: 27566046
Change-Id: Ic14033c4e6d833d973beb035ddc1c6134fb35a3f
diff --git a/liblog/log_cdefs.h b/liblog/log_cdefs.h
new file mode 100644
index 0000000..3a52625
--- /dev/null
+++ b/liblog/log_cdefs.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _LIBLOG_CDEFS_H__
+#define _LIBLOG_CDEFS_H__
+
+#include <sys/cdefs.h>
+
+/* Declare this library function hidden and internal */
+#if defined(_WIN32)
+#define LIBLOG_HIDDEN
+#else
+#define LIBLOG_HIDDEN __attribute__((visibility("hidden")))
+#endif
+
+/* Declare this library function visible and external */
+#if defined(_WIN32)
+#define LIBLOG_ABI_PUBLIC
+#else
+#define LIBLOG_ABI_PUBLIC __attribute__((visibility("default")))
+#endif
+
+/* Declare this library function visible but private */
+#define LIBLOG_ABI_PRIVATE LIBLOG_ABI_PUBLIC
+
+/*
+ * Declare this library function as reimplementation.
+ * Prevent circular dependencies, but allow _real_ library to hijack
+ */
+#if defined(_WIN32)
+#define LIBLOG_WEAK static /* Accept that it is totally private */
+#else
+#define LIBLOG_WEAK __attribute__((weak,visibility("default")))
+#endif
+
+/* Unused argument. For C code only, remove symbol name for C++ */
+#ifndef __unused
+#define __unused __attribute__((__unused__))
+#endif
+
+#endif /* _LIBLOG_CDEFS_H__ */