X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=include%2Fhelper.h;h=e529ba08bc5f2bd0e101e8dbdf5228eba62dd39d;hb=c0c0989ab70574e09b2f7e8b48c2da6af664a849;hp=9873feadd85b020556c1cd1e4f45925094b1fdd1;hpb=171fcc6fd03e3f5787b3d0ee8aedc8cb9bcc6f17;p=lttng-ust.git

diff --git a/include/helper.h b/include/helper.h
index 9873fead..e529ba08 100644
--- a/include/helper.h
+++ b/include/helper.h
@@ -1,24 +1,12 @@
-#ifndef _LTTNG_UST_HELPER_H
-#define _LTTNG_UST_HELPER_H
-
 /*
- * Copyright (C) 2011  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; version 2.1 of
- * the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  */
 
+#ifndef _LTTNG_UST_HELPER_H
+#define _LTTNG_UST_HELPER_H
+
 #include <stdlib.h>
 
 static inline __attribute__((always_inline))
@@ -55,4 +43,15 @@ void *zmalloc(size_t len)
 #define LTTNG_UST_CALLER_IP()		__builtin_return_address(0)
 #endif /* #else #if defined(__PPC__) && !defined(__PPC64__) */
 
+/*
+ * LTTNG_HIDDEN: set the hidden attribute for internal functions
+ * On Windows, symbols are local unless explicitly exported,
+ * see https://gcc.gnu.org/wiki/Visibility
+ */
+#if defined(_WIN32) || defined(__CYGWIN__)
+#define LTTNG_HIDDEN
+#else
+#define LTTNG_HIDDEN __attribute__((visibility("hidden")))
+#endif
+
 #endif /* _LTTNG_UST_HELPER_H */