[llvm] [ELF] Correctly set the `nvptx` triple from `makeTriple()` (PR #76970)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-binary-utilities

Author: Joseph Huber (jhuber6)

<details>
<summary>Changes</summary>

Summary:
The ELFObject file should be able to handle `nvptx` objects be we
currently list them as unknown. This patch should now make it return
`nvptx64--` correctly.


---
Full diff: https://github.com/llvm/llvm-project/pull/76970.diff


1 Files Affected:

- (modified) llvm/include/llvm/Object/ELFObjectFile.h (+7) 


``````````diff
diff --git a/llvm/include/llvm/Object/ELFObjectFile.h b/llvm/include/llvm/Object/ELFObjectFile.h
index 99477644de4de7..da78e11b678d99 100644
--- a/llvm/include/llvm/Object/ELFObjectFile.h
+++ b/llvm/include/llvm/Object/ELFObjectFile.h
@@ -1349,6 +1349,13 @@ template <class ELFT> Triple::ArchType ELFObjectFile<ELFT>::getArch() const {
     return Triple::UnknownArch;
   }
 
+  case ELF::EM_CUDA: {
+    if (EF.getHeader().e_ident[ELF::EI_CLASS] == ELF::ELFCLASS32)
+      return Triple::nvptx;
+    else
+      return Triple::nvptx64;
+  }
+
   case ELF::EM_BPF:
     return IsLittleEndian ? Triple::bpfel : Triple::bpfeb;
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/76970