Enabled gcc for hip host code (#1214)

* Enabled gcc for hip host code

* Adding tests for hip code + (gcc & g++), without kernels

* Excluding nvcc platforms for gcc and g++ tests + Addressing review comments

* minor code clean-up

* Add rocm include path

* Added relative path for library

* Hiding non supported functions for gcc

* Incorporating review comments

tests/src/dynamicLoading/complex_loading_behavior.cpp

@@ -21,7 +21,7 @@ THE SOFTWARE.
 */
 
 /* HIT_START
- * BUILD_CMD: libfoo_amd %hc %S/%s -o libfoo.so -fPIC -lpthread -shared -DTEST_SHARED_LIBRARY EXCLUDE_HIP_PLATFORM nvcc
+ * BUILD_CMD: libfoo_amd %hc %S/%s -o libfoo.so -Xcompiler -fPIC -lpthread -shared -DTEST_SHARED_LIBRARY EXCLUDE_HIP_PLATFORM nvcc
  * BUILD_CMD: libfoo_nvidia %hc %S/%s -o libfoo.so -Xcompiler -fPIC -lpthread -shared -DTEST_SHARED_LIBRARY EXCLUDE_HIP_PLATFORM hcc
  * BUILD_CMD: %t %hc %S/%s -o %T/%t -ldl
  * TEST: %t