[LLMV] set OpenBSD's ELFOSABI by default

This matches what is done for FreeBSD. OpenBSD has a few special program header types, and other such ELF extensions. Setting the ELFOSABI like so will allow LLD to support them without needlessly impacting non-OpenBSD ELFs. Testing strategy matches 8738c5b / D107748. Added one for FreeBSD too for good measure.
llvm · Jul 10, 2024 · 9da46ac · 9da46ac
1 parent 221d5c5
commit 9da46ac
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diff --git a/llvm/include/llvm/MC/MCELFObjectWriter.h b/llvm/include/llvm/MC/MCELFObjectWriter.h
@@ -78,6 +78,8 @@ class MCELFObjectTargetWriter : public MCObjectTargetWriter {
         return ELF::ELFOSABI_FREEBSD;
       case Triple::Solaris:
         return ELF::ELFOSABI_SOLARIS;
+      case Triple::OpenBSD:
+        return ELF::ELFOSABI_OPENBSD;
       default:
         return ELF::ELFOSABI_NONE;
     }

diff --git a/llvm/test/MC/ELF/osabi-freebsd.s b/llvm/test/MC/ELF/osabi-freebsd.s
@@ -0,0 +1,2 @@
+# RUN: llvm-mc -filetype obj -triple amd64-freebsd %s | llvm-readobj -hS - | FileCheck %s
+# CHECK: OS/ABI: FreeBSD
diff --git a/llvm/test/MC/ELF/osabi-openbsd.s b/llvm/test/MC/ELF/osabi-openbsd.s
@@ -0,0 +1,2 @@
+# RUN: llvm-mc -filetype obj -triple amd64-openbsd %s | llvm-readobj -hS - | FileCheck %s
+# CHECK: OS/ABI: OpenBSD