[SYCL][Driver] Fix issue that sycl is not able to print internal defi…

clang/lib/Driver/Driver.cpp

@@ -5740,6 +5740,7 @@ InputInfo Driver::BuildJobsForActionNoCache(
 
   // Only use pipes when there is exactly one input.
   InputInfoList InputInfos;
+  bool JobForPreprocessToStdout = false;
   for (const Action *Input : Inputs) {
     // Treat dsymutil and verify sub-jobs as being at the top-level too, they
     // shouldn't get temporary output names.
@@ -5750,6 +5751,11 @@ InputInfo Driver::BuildJobsForActionNoCache(
         C, Input, TC, BoundArch, SubJobAtTopLevel, MultipleArchs, LinkingOutput,
         CachedResults, A->getOffloadingDeviceKind()));
   }
+  // Check if we are in sub-work for preprocessing for host side. If so we will
+  // add another job to print information to terminal later.
+  if (!AtTopLevel && A->getKind() == Action::PreprocessJobClass &&
+      C.getJobs().size() == 1)
+    JobForPreprocessToStdout = true;
 
   // Always use the first input as the base input.
   const char *BaseInput = InputInfos[0].getBaseInput();
@@ -5784,6 +5790,7 @@ InputInfo Driver::BuildJobsForActionNoCache(
 
   // Determine the place to write output to, if any.
   InputInfo Result;
+  InputInfo ResultForPreprocessToStdout;
   InputInfoList UnbundlingResults;
   if (auto *UA = dyn_cast<OffloadUnbundlingJobAction>(JA)) {
     // If we have an unbundling job, we need to create results for all the
@@ -5945,6 +5952,8 @@ InputInfo Driver::BuildJobsForActionNoCache(
                                              AtTopLevel, MultipleArchs,
                                              OffloadingPrefix),
                        BaseInput);
+    if (JobForPreprocessToStdout)
+      ResultForPreprocessToStdout = InputInfo(A, "-", BaseInput);
   }
 
   if (CCCPrintBindings && !CCGenDiagnostics) {
@@ -5967,12 +5976,19 @@ InputInfo Driver::BuildJobsForActionNoCache(
       llvm::errs() << "] \n";
     }
   } else {
-    if (UnbundlingResults.empty())
+    if (UnbundlingResults.empty()) {
       T->ConstructJob(
           C, *JA, Result, InputInfos,
           C.getArgsForToolChain(TC, BoundArch, JA->getOffloadingDeviceKind()),
           LinkingOutput);
-    else
+      // Add another job to print information to terminal for host side.
+      if (JobForPreprocessToStdout) {
+        T->ConstructJob(
+            C, *JA, ResultForPreprocessToStdout, InputInfos,
+            C.getArgsForToolChain(TC, BoundArch, JA->getOffloadingDeviceKind()),
+            LinkingOutput);
+      }
+    } else
       T->ConstructJobMultipleOutputs(
           C, *JA, UnbundlingResults, InputInfos,
           C.getArgsForToolChain(TC, BoundArch, JA->getOffloadingDeviceKind()),

clang/test/Driver/print-internal-defines-for-sycl.c

@@ -0,0 +1,5 @@
+// Test if clang is able to print internal defines in SYCL mode
+//
+// RUN: %clangxx -fsycl -dM -E -x c++ %s 2>&1 \
+// RUN: | FileCheck --check-prefix CHECK-PRINT-INTERNAL-DEFINES %s
+// CHECK-PRINT-INTERNAL-DEFINES: #define