[SYCL][Driver] Link with sycl libs at link step of clang-cl -fsycl (#12793)

This PR is addressing the following scenario:
clang-cl -I[path to sycl headers] sycl_program.cpp # program compiled
but without sycl libs
clang-cl -fsycl sycl_program.obj # user expects sycl libs to be linked
automatically here.

Without this fix this scenario fails at link step because sycl libraries
are not pulled in.

This scenario already works for clang driver, so only clang-cl needs a
fix.

Author: againull

clang/lib/Driver/ToolChains/MSVC.cpp

@@ -130,18 +130,23 @@ void visualstudio::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-defaultlib:oldnames");
   }
 
-  if ((!C.getDriver().IsCLMode() && Args.hasArg(options::OPT_fsycl) &&
+  if ((Args.hasArg(options::OPT_fsycl) &&
        !Args.hasArg(options::OPT_nolibsycl)) ||
       Args.hasArg(options::OPT_fsycl_host_compiler_EQ)) {
     CmdArgs.push_back(Args.MakeArgString(std::string("-libpath:") +
                                          TC.getDriver().Dir + "/../lib"));
-    // When msvcrtd is added via --dependent-lib, we add the sycld
-    // equivalent.  Do not add the -defaultlib as it conflicts.
-    if (!isDependentLibAdded(Args, "msvcrtd")) {
+    if (!Args.hasArg(options::OPT__SLASH_MDd) &&
+        !isDependentLibAdded(Args, "msvcrtd")) {
       if (Args.hasArg(options::OPT_fpreview_breaking_changes))
         CmdArgs.push_back("-defaultlib:sycl" SYCL_MAJOR_VERSION "-preview.lib");
       else
         CmdArgs.push_back("-defaultlib:sycl" SYCL_MAJOR_VERSION ".lib");
+    } else {
+      if (Args.hasArg(options::OPT_fpreview_breaking_changes))
+        CmdArgs.push_back("-defaultlib:sycl" SYCL_MAJOR_VERSION
+                          "-previewd.lib");
+      else
+        CmdArgs.push_back("-defaultlib:sycl" SYCL_MAJOR_VERSION "d.lib");
     }
     CmdArgs.push_back("-defaultlib:sycl-devicelib-host.lib");
   }

clang/test/Driver/sycl-offload.c

@@ -363,7 +363,7 @@
 // RUN: %clang -fsycl -target x86_64-unknown-windows-msvc %s -o %t -### 2>&1 | FileCheck -check-prefix=CHECK-LINK-SYCL %s
 // RUN: %clang_cl -fsycl %s -o %t -### 2>&1 | FileCheck -check-prefix=CHECK-LINK-SYCL-CL %s
 // CHECK-LINK-SYCL-CL: "--dependent-lib=sycl{{[0-9]*}}"
-// CHECK-LINK-SYCL-CL-NOT: "-defaultlib:sycl{{[0-9]*}}.lib"
+// CHECK-LINK-SYCL-CL: "-defaultlib:sycl{{[0-9]*}}.lib"
 // CHECK-LINK-SYCL: "-defaultlib:sycl{{[0-9]*}}.lib"
 
 /// Check no SYCL runtime is linked with -nolibsycl
@@ -688,3 +688,16 @@
 // FSYCL-PREVIEW-BREAKING-CHANGES-DEBUG-CHECK: --dependent-lib=sycl{{[0-9]*}}-previewd
 // FSYCL-PREVIEW-BREAKING-CHANGES-DEBUG-CHECK-NOT: -defaultlib:sycl{{[0-9]*}}.lib
 // FSYCL-PREVIEW-BREAKING-CHANGES-DEBUG-CHECK-NOT: -defaultlib:sycl{{[0-9]*}}-preview.lib
+
+
+/// Check that at link step of "clang-cl -fsycl" we pull in sycl.lib even if at the compilation step sycl libraries were not provided (this is possible if user compiles manually without -fsycl by provided paths to the headers).
+// RUN: %clang_cl -### -fsycl -nolibsycl -target x86_64-unknown-windows-msvc -c %s 2>&1 | FileCheck -check-prefix FSYCL-CL-COMPILE-NOLIBS-CHECK %s
+// RUN: %clang_cl -### -fsycl %s 2>&1 | FileCheck -check-prefix FSYCL-CL-LINK-CHECK %s
+// FSYCL-CL-COMPILE-NOLIBS-CHECK-NOT: "--dependent-lib=sycl{{[0-9]*}}"
+// FSYCL-CL-LINK-CHECK: "-defaultlib:sycl{{[0-9]*}}.lib"
+
+/// Check that at link step of "clang-cl -fsycl /MDd" we pull in sycld.lib even if at the compilation step sycl libraries were not provided (this is possible if user compiles manually without -fsycl by provided paths to the headers).
+// RUN: %clang_cl -### -fsycl -nolibsycl /MDd -target x86_64-unknown-windows-msvc -c %s 2>&1 | FileCheck -check-prefix FSYCL-CL-COMPILE-NOLIBS-MDd-CHECK %s
+// RUN: %clang_cl -### -fsycl /MDd %s 2>&1 | FileCheck -check-prefix FSYCL-CL-LINK--MDd-CHECK %s
+// FSYCL-CL-COMPILE-NOLIBS-MDd-CHECK-NOT: "--dependent-lib=sycl{{[0-9]*}}d"
+// FSYCL-CL-LINK--MDd-CHECK: "-defaultlib:sycl{{[0-9]*}}d.lib"