[clang] [llvm] [Driver][SYCL] Add initial SYCL offload compilation support (PR #107493)

[Tom Honermann via cfe-commits]

================
@@ -0,0 +1,82 @@
+//===--- SYCL.h - SYCL ToolChain Implementations ----------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_SYCL_H
+#define LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_SYCL_H
+
+#include "clang/Driver/Tool.h"
+#include "clang/Driver/ToolChain.h"
+
+namespace clang {
+namespace driver {
+
+class SYCLInstallationDetector {
+public:
+  SYCLInstallationDetector(const Driver &D);
+  void AddSYCLIncludeArgs(const llvm::opt::ArgList &DriverArgs,
+                          llvm::opt::ArgStringList &CC1Args) const;
+  void print(llvm::raw_ostream &OS) const;
+
+private:
+  const Driver &D;
+  llvm::SmallVector<llvm::SmallString<128>, 4> InstallationCandidates;
+};
+
+namespace toolchains {
+
+class LLVM_LIBRARY_VISIBILITY SYCLToolChain : public ToolChain {
+public:
+  SYCLToolChain(const Driver &D, const llvm::Triple &Triple,
+                const ToolChain &HostTC, const llvm::opt::ArgList &Args);
+
+  const llvm::Triple *getAuxTriple() const override {
+    return &HostTC.getTriple();
+  }
+
+  llvm::opt::DerivedArgList *
+  TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
+                Action::OffloadKind DeviceOffloadKind) const override;
+  void addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
+                         llvm::opt::ArgStringList &CC1Args,
+                         Action::OffloadKind DeviceOffloadKind) const override;
+
+  bool useIntegratedAs() const override { return true; }
+  bool isPICDefault() const override { return false; }
+  llvm::codegenoptions::DebugInfoFormat getDefaultDebugFormat() const override {
+    if (this->HostTC.getTriple().isWindowsMSVCEnvironment())
+      return this->HostTC.getDefaultDebugFormat();
+    return ToolChain::getDefaultDebugFormat();
+  }
+  bool isPIEDefault(const llvm::opt::ArgList &Args) const override {
+    return false;
+  }
+  bool isPICDefaultForced() const override { return false; }
+
+  void addClangWarningOptions(llvm::opt::ArgStringList &CC1Args) const override;
+  CXXStdlibType GetCXXStdlibType(const llvm::opt::ArgList &Args) const override;
+  void AddSYCLIncludeArgs(const llvm::opt::ArgList &DriverArgs,
+                          llvm::opt::ArgStringList &CC1Args) const override;
+  void AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
+                            llvm::opt::ArgStringList &CC1Args) const override;
+  void AddClangCXXStdlibIncludeArgs(
+      const llvm::opt::ArgList &Args,
+      llvm::opt::ArgStringList &CC1Args) const override;
+
+  SanitizerMask getSupportedSanitizers() const override;
+
+  const ToolChain &HostTC;
+
+  SYCLInstallationDetector SYCLInstallation;
----------------
tahonermann wrote:

```suggestion
private:
  const ToolChain &HostTC;
  SYCLInstallationDetector SYCLInstallation;
```

https://github.com/llvm/llvm-project/pull/107493