[clang] [llvm] [clang-linker-wrapper] Add ELF packaging for spirv64-intel OpenMP images (PR #125737)

[Nick Sarnie via llvm-commits]

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@@ -373,3 +375,86 @@ Error llvm::offloading::amdgpu::getAMDGPUMetaDataFromImage(
   }
   return Error::success();
 }
+Error offloading::intel::containerizeOpenMPSPIRVImage(
+    std::unique_ptr<MemoryBuffer> &Img) {
+  constexpr char INTEL_ONEOMP_OFFLOAD_VERSION[] = "1.0";
+  constexpr int NT_INTEL_ONEOMP_OFFLOAD_VERSION = 1;
+  constexpr int NT_INTEL_ONEOMP_OFFLOAD_IMAGE_COUNT = 2;
+  constexpr int NT_INTEL_ONEOMP_OFFLOAD_IMAGE_AUX = 3;
+
+  // Start creating notes for the ELF container.
+  std::vector<ELFYAML::NoteEntry> Notes;
+  std::string Version = toHex(INTEL_ONEOMP_OFFLOAD_VERSION);
+  Notes.emplace_back(ELFYAML::NoteEntry{"INTELONEOMPOFFLOAD",
+                                        yaml::BinaryRef(Version),
+                                        NT_INTEL_ONEOMP_OFFLOAD_VERSION});
+
+  // The AuxInfo string will hold auxiliary information for the image.
+  // ELFYAML::NoteEntry structures will hold references to the
+  // string, so we have to make sure the string is valid.
+  std::string AuxInfo;
+
+  // TODO: Pass compile/link opts
+  StringRef CompileOpts = "";
+  StringRef LinkOpts = "";
+
+  unsigned ImageFmt = 1; // SPIR-V format
+
+  AuxInfo = toHex((Twine(0) + Twine('\0') + Twine(ImageFmt) + Twine('\0') +
+                   CompileOpts + Twine('\0') + LinkOpts)
+                      .str());
+  Notes.emplace_back(ELFYAML::NoteEntry{"INTELONEOMPOFFLOAD",
+                                        yaml::BinaryRef(AuxInfo),
+                                        NT_INTEL_ONEOMP_OFFLOAD_IMAGE_AUX});
+
+  std::string ImgCount = toHex(Twine(1).str()); // always one image per ELF
+  Notes.emplace_back(ELFYAML::NoteEntry{"INTELONEOMPOFFLOAD",
+                                        yaml::BinaryRef(ImgCount),
+                                        NT_INTEL_ONEOMP_OFFLOAD_IMAGE_COUNT});
+
+  std::string YamlFile;
+  llvm::raw_string_ostream YamlFileStream(YamlFile);
+
+  // Write YAML template file.
+  {
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sarnex wrote:

No, will remove, thanks

https://github.com/llvm/llvm-project/pull/125737