[SYCL] Ignore extra command line arguments for syntax only tests (#4139)

It is possible to pass extra flags to clang for lit tests with
the CMake variable `SYCL_CLANG_EXTRA_FLAGS`.

So in some cases we may end up with command line arguments that are not
used in syntax only tests, such as `-mcpu` (which is required for ROCm
AMD), which clang will warn against, and since a lot of these tests are
also checking for any warnings, it will trip them up.

So this patch simply disables the warnings for unused command line
arguments in syntax only lit tests that check for warnings.

Author: npmiller

sycl/test/esimd/enums.cpp

@@ -1,4 +1,4 @@
-// RUN: %clangxx -fsycl -fsyntax-only %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
+// RUN: %clangxx -fsycl -fsyntax-only -Wno-unused-command-line-argument %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
 
 // This test checks compilation of various ESIMD enum types. Those which are
 // deprecated must produce deprecation messages.

sycl/test/esimd/flat_atomic.cpp

@@ -1,4 +1,4 @@
-// RUN: %clangxx -fsycl -fsyntax-only %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
+// RUN: %clangxx -fsycl -fsyntax-only -Wno-unused-command-line-argument %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
 
 // This test checks compilation of ESIMD atomic APIs. Those which are deprecated
 // must produce deprecation messages.

sycl/test/esimd/gather_scatter_rgba.cpp

@@ -1,4 +1,4 @@
-// RUN: %clangxx -fsycl -fsyntax-only %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
+// RUN: %clangxx -fsycl -fsyntax-only -Wno-unused-command-line-argument %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
 
 // This test checks compilation of ESIMD slm gather_rgba/scatter_rgba APIs.
 // Those which are deprecated must produce deprecation messages.

sycl/test/esimd/simd_copy_to_copy_from.cpp

@@ -1,5 +1,5 @@
-// RUN: not %clangxx -fsycl -fsycl-device-only -fsyntax-only %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
-// RUN: not %clangxx %fsycl-host-only -fsyntax-only %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
+// RUN: not %clangxx -fsycl -fsycl-device-only -fsyntax-only -Wno-unused-command-line-argument %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
+// RUN: not %clangxx %fsycl-host-only -fsyntax-only -Wno-unused-command-line-argument %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
 
 // This test checks that both host and device compilers can:
 // - successfully compile simd::copy_to and simd::copy_from APIs

sycl/test/esimd/simd_subscript.cpp

@@ -1,4 +1,4 @@
-// RUN: not %clangxx -fsycl -fsyntax-only %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
+// RUN: not %clangxx -fsycl -fsyntax-only -Wno-unused-command-line-argument %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
 
 #include <sycl/ext/intel/experimental/esimd.hpp>
 

sycl/test/esimd/slm_atomic.cpp

@@ -1,4 +1,4 @@
-// RUN: %clangxx -fsycl -fsyntax-only %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
+// RUN: %clangxx -fsycl -fsyntax-only -Wno-unused-command-line-argument %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
 
 // This test checks compilation of ESIMD slm atomic APIs. Those which are
 // deprecated must produce deprecation messages.

sycl/test/esimd/slm_load4.cpp

@@ -1,4 +1,4 @@
-// RUN: %clangxx -fsycl -fsyntax-only %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
+// RUN: %clangxx -fsycl -fsyntax-only -Wno-unused-command-line-argument %s 2>&1 | FileCheck %s --implicit-check-not="warning:" --implicit-check-not="error:"
 
 // This test checks compilation of ESIMD slm load4/store4 APIs. Those which are
 // deprecated must produce deprecation messages.

sycl/test/warnings/warnings.cpp

@@ -1,6 +1,6 @@
-// RUN: %clangxx -fsycl --no-system-header-prefix=CL/sycl -fsyntax-only -Wall -Wextra -Werror -Wno-ignored-attributes -Wno-deprecated-declarations -Wpessimizing-move -Wunused-variable -Wmismatched-tags -Wunneeded-internal-declaration -Wno-unknown-cuda-version -Wno-unused-parameter %s
+// RUN: %clangxx -fsycl --no-system-header-prefix=CL/sycl -fsyntax-only -Wall -Wextra -Werror -Wno-ignored-attributes -Wno-deprecated-declarations -Wpessimizing-move -Wunused-variable -Wmismatched-tags -Wunneeded-internal-declaration -Wno-unknown-cuda-version -Wno-unused-parameter -Wno-unused-command-line-argument %s
 // RUN: %clangxx -fsycl -E --no-system-header-prefix=CL/sycl %s -o %t.ii
-// RUN: %clangxx -fsycl -fsyntax-only -Wall -Wextra -Werror -Wno-ignored-attributes -Wno-deprecated-declarations -Wpessimizing-move -Wunused-variable -Wmismatched-tags -Wunneeded-internal-declaration -Wno-unknown-cuda-version -Wno-unused-parameter %t.ii
+// RUN: %clangxx -fsycl -fsyntax-only -Wall -Wextra -Werror -Wno-ignored-attributes -Wno-deprecated-declarations -Wpessimizing-move -Wunused-variable -Wmismatched-tags -Wunneeded-internal-declaration -Wno-unknown-cuda-version -Wno-unused-parameter -Wno-unused-command-line-argument %t.ii
 #include <CL/sycl.hpp>
 
 using namespace cl::sycl;