[Driver][SYCL][FPGA] Proper dependency output location when given /Fo<dir> (#1346)

When using /Fo<dir> the improper dependency file name was generated, causing
the bundle step to not be able to locate the dependency file when compiling
to object

Signed-off-by: Michael D Toguchi <[email protected]>

Author: mdtoguchi

clang/lib/Driver/ToolChains/Clang.cpp

@@ -6801,9 +6801,12 @@ const char *Clang::getDependencyFileName(const ArgList &Args,
 
   if (Arg *OutputOpt =
           Args.getLastArg(options::OPT_o, options::OPT__SLASH_Fo)) {
-    SmallString<128> OutputFilename(OutputOpt->getValue());
-    llvm::sys::path::replace_extension(OutputFilename, llvm::Twine('d'));
-    return Args.MakeArgString(OutputFilename);
+    SmallString<128> OutputArgument(OutputOpt->getValue());
+    if (llvm::sys::path::is_separator(OutputArgument.back()))
+      // If the argument is a directory, output to BaseName in that dir.
+      llvm::sys::path::append(OutputArgument, getBaseInputStem(Args, Inputs));
+    llvm::sys::path::replace_extension(OutputArgument, llvm::Twine('d'));
+    return Args.MakeArgString(OutputArgument);
   }
 
   return Args.MakeArgString(Twine(getBaseInputStem(Args, Inputs)) + ".d");

clang/test/Driver/sycl-offload-intelfpga.cpp

@@ -277,6 +277,13 @@
 // RUN:  | FileCheck -check-prefix=CHK-FPGA-REPORT-NAME %s
 // CHK-FPGA-REPORT-NAME: aoc{{.*}} "-sycl"{{.*}} "-output-report-folder=dummy2.prj"
 
+/// -fintelfpga output dep file using -Fo<dir>
+// RUN: mkdir -p %t_dir
+// RUN: %clang_cl -### -c -fsycl -fintelfpga -Fo%t_dir/ %s 2>&1 \
+// RUN:  | FileCheck -DDEPDIR=%t_dir/ -check-prefix=CHK-FPGA-DEP-DIR %s
+// CHK-FPGA-DEP-DIR: clang{{.*}} "-dependency-file" "[[DEPDIR]][[DEPFILE:.+\.d]]"
+// CHK-FPGA-DEP-DIR: clang-offload-bundler{{.*}} "-inputs={{.*}}.bc,{{.*}}.obj,[[DEPDIR]][[DEPFILE]]"
+
 /// -fintelfpga static lib (aoco)
 // RUN:  echo "Dummy AOCO image" > %t.aoco
 // RUN:  echo "void foo() {}" > %t.c