Remove "C" linkages (#781)

* Remove extern C linkages

* Update crc32 to cpp and remove extern C linkage

test_conformance/gl/GLEW/GL/eglew.h

@@ -108,10 +108,6 @@
 
 #include <GL/glew.h>
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 typedef int32_t EGLint;
 
 typedef unsigned int EGLBoolean;
@@ -2611,8 +2607,4 @@ GLEWAPI GLboolean GLEWAPIENTRY eglewIsSupported (const char *name);
 
 GLEWAPI GLboolean GLEWAPIENTRY eglewGetExtension (const char *name);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif /* __eglew_h__ */

test_conformance/gl/GLEW/GL/glew.h

@@ -266,10 +266,6 @@ typedef _W64 int ptrdiff_t;
 #define GLEW_VAR_EXPORT GLEWAPI
 #define GLEW_FUN_EXPORT GLEWAPI
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* ----------------------------- GL_VERSION_1_1 ---------------------------- */
 
 #ifndef GL_VERSION_1_1
@@ -23661,10 +23657,6 @@ GLEWAPI GLboolean GLEWAPIENTRY glewGetExtension (const char *name);
 GLEWAPI const GLubyte * GLEWAPIENTRY glewGetErrorString (GLenum error);
 GLEWAPI const GLubyte * GLEWAPIENTRY glewGetString (GLenum name);
 
-#ifdef __cplusplus
-}
-#endif
-
 #ifdef GLEW_APIENTRY_DEFINED
 #undef GLEW_APIENTRY_DEFINED
 #undef APIENTRY

test_conformance/gl/GLEW/GL/glxew.h

@@ -100,10 +100,6 @@
 #include <X11/Xmd.h>
 #include <GL/glew.h>
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* ---------------------------- GLX_VERSION_1_0 --------------------------- */
 
 #ifndef GLX_VERSION_1_0
@@ -1768,8 +1764,4 @@ GLEWAPI GLboolean GLEWAPIENTRY glxewIsSupported (const char *name);
 
 GLEWAPI GLboolean GLEWAPIENTRY glxewGetExtension (const char *name);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif /* __glxew_h__ */

test_conformance/gl/GLEW/GL/wglew.h

@@ -85,10 +85,6 @@
 #  endif
 #endif
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* -------------------------- WGL_3DFX_multisample ------------------------- */
 
 #ifndef WGL_3DFX_multisample
@@ -1438,10 +1434,6 @@ GLEWAPI GLboolean GLEWAPIENTRY wglewIsSupported (const char *name);
 
 GLEWAPI GLboolean GLEWAPIENTRY wglewGetExtension (const char *name);
 
-#ifdef __cplusplus
-}
-#endif
-
 #undef GLEWAPI
 
 #endif /* __wglew_h__ */

test_conformance/gl/test_buffers.cpp

@@ -21,8 +21,6 @@
     #include <CL/cl_gl.h>
 #endif
 
-extern "C" { extern cl_uint gRandomSeed; };
-
 static const char *bufferKernelPattern =
 "__kernel void sample_test( __global %s%s *source, __global %s%s *clDest, __global %s%s *glDest )\n"
 "{\n"

test_conformance/gl/test_images_2D.cpp

@@ -26,8 +26,6 @@
 
 using namespace std;
 
-extern "C" { extern cl_uint gRandomSeed; }
-
 #pragma mark -
 #pragma mark _2D read tests
 

test_conformance/gl/test_images_3D.cpp

@@ -26,8 +26,6 @@
 
 using namespace std;
 
-extern "C" { extern cl_uint gRandomSeed; };
-
 #pragma mark -
 #pragma mark _3D read test
 

test_conformance/gl/test_images_depth.cpp

@@ -27,8 +27,6 @@
 
 using namespace std;
 
-extern "C" { extern cl_uint gRandomSeed; }
-
 #pragma mark -
 #pragma mark _2D depth read tests
 

test_conformance/gl/test_images_getinfo_common.cpp

@@ -23,8 +23,6 @@
     #include <CL/cl_gl.h>
 #endif
 
-extern "C" { extern cl_uint gRandomSeed; };
-
 extern int supportsHalf(cl_context context, bool* supports_half);
 
 static int test_image_info( cl_context context, cl_command_queue queue,

test_conformance/gl/test_images_read_common.cpp

@@ -23,8 +23,6 @@
     #include <CL/cl_gl.h>
 #endif
 
-extern "C" { extern cl_uint gRandomSeed; };
-
 extern int supportsHalf(cl_context context, bool* supports_half);
 extern int supportsMsaa(cl_context context, bool* supports_msaa);
 extern int supportsDepth(cl_context context, bool* supports_depth);

test_conformance/gl/test_images_write_common.cpp

@@ -24,8 +24,6 @@
     #include <CL/cl_gl.h>
 #endif
 
-extern "C" { extern cl_uint gRandomSeed; };
-
 #pragma mark -
 #pragma mark Write test kernels
 

test_conformance/gl/test_renderbuffer.cpp

@@ -52,8 +52,6 @@ gluCheckExtension(const GLubyte *extension, const GLubyte *extensions)
 #endif
 
 
-extern "C" { extern cl_uint gRandomSeed; };
-
 // This is defined in the write common code:
 extern int test_cl_image_write( cl_context context, cl_command_queue queue,
   GLenum target, cl_mem clImage, size_t width, size_t height, size_t depth,

test_conformance/gl/test_renderbuffer_info.cpp

@@ -21,8 +21,6 @@
 #include <CL/cl_gl.h>
 #endif
 
-extern "C" {extern cl_uint gRandomSeed;};
-
 static int test_renderbuffer_object_info( cl_context context, cl_command_queue queue,
                                           GLsizei width, GLsizei height, GLenum attachment,
                                           GLenum format, GLenum internalFormat,