Fix Build Warnings for AArch64 (#2242)

This commit links to issue (#2234).

When cross-compiling for AArch64, using gcc 13.3, you encounter three
warnings types that turn into errors:

- maybe-uninitialized
- stringop-truncation
- strict-aliasing

This commit fixes all the warnings found, in regards to the first two
rules. To resolve the warnigns due to strict-aliasing, I am editing the
CMake build system.

Signed-off-by: Antonios Christidis <a-christidis@ti.com>

test_conformance/images/kernel_read_write/test_cl_ext_image_buffer.hpp

@@ -69,7 +69,7 @@ static inline size_t get_format_size(cl_context context,
     }
 
     cl_int error = 0;
-    cl_mem buffer;
+    cl_mem buffer = nullptr;
     if (imageType == CL_MEM_OBJECT_IMAGE1D_BUFFER)
     {
         buffer = clCreateBuffer(context, flags,

test_conformance/images/kernel_read_write/test_cl_ext_image_from_buffer.cpp

@@ -769,7 +769,7 @@ int image_from_buffer_fill_positive(cl_device_id device, cl_context context,
                 err = clFinish(queue);
                 test_error(err, "Error clFinish");
 
-                cl_mem image1d_buffer;
+                cl_mem image1d_buffer = nullptr;
                 if (imageType == CL_MEM_OBJECT_IMAGE1D_BUFFER)
                 {
                     image1d_buffer = clCreateBuffer(context, flag, buffer_size,

test_conformance/images/kernel_read_write/test_iterations.cpp

@@ -1191,7 +1191,7 @@ int test_read_image_2D( cl_context context, cl_command_queue queue, cl_kernel ke
 {
     int error;
     static int initHalf = 0;
-    cl_mem imageBuffer;
+    cl_mem imageBuffer = nullptr;
     cl_mem_flags    image_read_write_flags = CL_MEM_READ_ONLY;
     size_t threads[2];
 

test_conformance/images/kernel_read_write/test_write_image.cpp

@@ -223,7 +223,7 @@ int test_write_image( cl_device_id device, cl_context context, cl_command_queue
         clProtectedImage protImage;
         clMemWrapper unprotImage;
         cl_mem image;
-        cl_mem imageBuffer;
+        cl_mem imageBuffer = nullptr;
 
         if( gMemFlagsToUse == CL_MEM_USE_HOST_PTR )
         {
@@ -910,7 +910,7 @@ int test_write_image_formats(cl_device_id device, cl_context context,
         gTestCount++;
 
         print_write_header( &imageFormat, false );
-        int retCode;
+        int retCode = 0;
         switch (imageType)
         {
             case CL_MEM_OBJECT_IMAGE1D: