[SYCL] Omit extensions (.a .o .out .lib .obj .exe) in output project directory name

For "-o file.xxx" where the option value has an extension, if the
extension is one of .a .o .out .lib .obj .exe, the output project
directory name will be file.proj which omits the extension. Otherwise
the output project directory name will be file.xxx.prj which keeps
the original extension.

Signed-off-by: Qichao Gu <[email protected]>

Author: qichaogu

clang/lib/Driver/ToolChains/SYCL.cpp

@@ -517,6 +517,11 @@ void SYCL::fpga::BackendCompiler::ConstructJob(
   if (Arg *FinalOutput = Args.getLastArg(options::OPT_o, options::OPT__SLASH_o,
                                          options::OPT__SLASH_Fe)) {
     SmallString<128> FN(FinalOutput->getValue());
+    // For "-o file.xxx" where the option value has an extension, if the
+    // extension is one of .a .o .out .lib .obj .exe, the output project
+    // directory name will be file.proj which omits the extension. Otherwise
+    // the output project directory name will be file.xxx.prj which keeps
+    // the original extension.
     StringRef Ext = llvm::sys::path::extension(FN);
     SmallVector<StringRef, 6> Exts = {".o",   ".a",   ".out",
                                       ".obj", ".lib", ".exe"};