[SYCL][Driver] Fix Windows CL SYCL device library detection logic (#1…

…2947)

If it's no RDC, the extension will definitely be BC. We need to switch
the condition order.

Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>

clang/lib/Driver/ToolChains/SYCL.cpp

@@ -416,12 +416,11 @@ const char *SYCL::Linker::constructLLVMLinkCommand(
     auto isSYCLDeviceLib = [&](const InputInfo &II) {
       const ToolChain *HostTC = C.getSingleOffloadToolChain<Action::OFK_Host>();
       StringRef LibPostfix = ".o";
-      if (HostTC->getTriple().isWindowsMSVCEnvironment() &&
-          C.getDriver().IsCLMode())
-        LibPostfix = ".obj";
-      else if (isNoRDCDeviceCodeLink(II))
+      if (isNoRDCDeviceCodeLink(II))
         LibPostfix = ".bc";
-
+      else if (HostTC->getTriple().isWindowsMSVCEnvironment() &&
+               C.getDriver().IsCLMode())
+        LibPostfix = ".obj";
       std::string FileName = this->getToolChain().getInputFilename(II);
       StringRef InputFilename = llvm::sys::path::filename(FileName);
       const bool IsNVPTX = this->getToolChain().getTriple().isNVPTX();

clang/test/Driver/sycl-no-rdc-win.cpp

@@ -32,3 +32,9 @@
 // CHECK: 96: clang-offload-wrapper, {95}, object, (device-sycl)
 // CHECK: 97: offload, "device-sycl (spir64-unknown-unknown)" {96}, object
 // CHECK: 98: linker, {9, 19, 90, 97}, image, (host-sycl)
+
+// RUN: %clang -### -fsycl -fno-sycl-rdc -c -fsycl-targets=spir64_gen --sysroot=%S/Inputs/SYCL-windows %t1.cpp 2>&1 | FileCheck -check-prefix=CHECK-EARLY %s
+// RUN: %clang_cl -### -fsycl -fno-sycl-rdc -c -fsycl-targets=spir64_gen /clang:--sysroot=%S/Inputs/SYCL-windows %t1.cpp 2>&1 | FileCheck -check-prefix=CHECK-EARLY %s
+// CHECK-EARLY: llvm-link{{.*}}
+// CHECK-EARLY-NOT: -only-needed
+// CHECK-EARLY: llvm-link{{.*}}-only-needed