Rework library loading test

Author: aobolensk

sycl/test/basic_tests/library_loading.cpp

@@ -0,0 +1,16 @@
+// REQUIRES: linux
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
+// RUN: env SYCL_PI_TRACE=-1 %t.out 2>&1 | FileCheck %s
+
+// Checks pi traces on library loading
+#include <CL/sycl.hpp>
+
+using namespace cl::sycl;
+
+int main() {
+  // CHECK: {{(SYCL_PI_TRACE\[-1\]: dlopen\(libpi_cuda.so\) failed with)|(SYCL_PI_TRACE\[basic\]: Plugin found and successfully loaded: libpi_cuda.so)}}
+  // CHECK: {{(SYCL_PI_TRACE\[-1\]: dlopen\(libpi_hip.so\) failed with)|(SYCL_PI_TRACE\[basic\]: Plugin found and successfully loaded: libpi_hip.so)}}
+  // CHECK: {{(SYCL_PI_TRACE\[-1\]: dlopen\(libpi_esimd_emulator.so\) failed with)|(SYCL_PI_TRACE\[basic\]: Plugin found and successfully loaded: libpi_esimd_emulator.so)}}
+  queue q;
+  q.submit([&](handler &cgh) {});
+}