From f7322931471a3161ca32dc0ca47fe013d56cf566 Mon Sep 17 00:00:00 2001
From: Sergey Sharybin <sergey.vfx@gmail.com>
Date: Tue, 23 Aug 2016 12:23:37 +0200
Subject: OpenCL: Support multiple ABI libraries on Linux

Solves issue reported in T49144.
---
 extern/clew/README.blender |  2 +-
 extern/clew/src/clew.c     | 23 +++++++++++++++++++----
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/extern/clew/README.blender b/extern/clew/README.blender
index e500a1bef7d..8355a96db8e 100644
--- a/extern/clew/README.blender
+++ b/extern/clew/README.blender
@@ -1,5 +1,5 @@
 Project: OpenCL Wrangler
 URL: https://github.com/OpenCLWrangler/clew
 License: Apache 2.0
-Upstream version: 277db43
+Upstream version: 309a653
 Local modifications: None
diff --git a/extern/clew/src/clew.c b/extern/clew/src/clew.c
index e3adabd829c..3717c74f1a0 100644
--- a/extern/clew/src/clew.c
+++ b/extern/clew/src/clew.c
@@ -137,6 +137,17 @@ PFNCLCREATEFROMGLTEXTURE3D          __clewCreateFromGLTexture3D         = NULL;
 #endif
 PFNCLGETGLCONTEXTINFOKHR            __clewGetGLContextInfoKHR           = NULL;
 
+static CLEW_DYNLIB_HANDLE dynamic_library_open_find(const char **paths) {
+  int i = 0;
+  while (paths[i] != NULL) {
+      CLEW_DYNLIB_HANDLE lib = CLEW_DYNLIB_OPEN(paths[i]);
+      if (lib != NULL) {
+        return lib;
+      }
+      ++i;
+  }
+  return NULL;
+}
 
 static void clewExit(void)
 {
@@ -151,11 +162,15 @@ static void clewExit(void)
 int clewInit()
 {
 #ifdef _WIN32
-    const char *path = "OpenCL.dll";
+    const char *paths[] = {"OpenCL.dll", NULL};
 #elif defined(__APPLE__)
-    const char *path = "/Library/Frameworks/OpenCL.framework/OpenCL";
+    const char *paths[] = {"/Library/Frameworks/OpenCL.framework/OpenCL", NULL};
 #else
-    const char *path = "libOpenCL.so";
+    const char *paths[] = {"libOpenCL.so",
+                           "libOpenCL.so.0",
+                           "libOpenCL.so.1",
+                           "libOpenCL.so.2",
+                           NULL};
 #endif
 
     int error = 0;
@@ -167,7 +182,7 @@ int clewInit()
     }
 
     //  Load library
-    module = CLEW_DYNLIB_OPEN(path);
+    module = dynamic_library_open_find(paths);
 
     //  Check for errors
     if (module == NULL)
-- 
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