[clang] Adding Loongarch64 to OpenBSD parts (PR #149737)

[Slava nerfur Voronzoff via cfe-commits]

https://github.com/nerfur created https://github.com/llvm/llvm-project/pull/149737

Adding Loongarch64 to OpenBSD parts

>From 6b9eedcc624316a565cfc4d5eb8c87c67442378f Mon Sep 17 00:00:00 2001
From: "Slava \"nerfur\" Voronzoff" <nerfur at gmail.com>
Date: Tue, 1 Jul 2025 20:01:34 +0300
Subject: [PATCH 1/5] OpenBSD in Targets.cpp

---
 clang/lib/Basic/Targets.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index af1111a863308..354c72a9eb110 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -752,6 +752,9 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
     case llvm::Triple::Linux:
       return std::make_unique<LinuxTargetInfo<LoongArch32TargetInfo>>(Triple,
                                                                       Opts);
+    case llvm::Triple::OpenBSD:
+      return std::make_unique<OpenBSDTargetInfo<LoongArch32TargetInfo>>(Triple,
+                                                                        Opts);
     default:
       return std::make_unique<LoongArch32TargetInfo>(Triple, Opts);
     }
@@ -769,6 +772,9 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
     case llvm::Triple::FreeBSD:
       return std::make_unique<FreeBSDTargetInfo<LoongArch64TargetInfo>>(Triple,
                                                                         Opts);
+    case llvm::Triple::OpenBSD:
+      return std::make_unique<OpenBSDTargetInfo<LoongArch64TargetInfo>>(Triple,
+                                                                        Opts);
     default:
       return std::make_unique<LoongArch64TargetInfo>(Triple, Opts);
     }

>From f30b4b8d6ff315830de1832bbb103cca3fb19f69 Mon Sep 17 00:00:00 2001
From: "Slava \"nerfur\" Voronzoff" <nerfur at gmail.com>
Date: Tue, 1 Jul 2025 20:09:57 +0300
Subject: [PATCH 2/5] OpenBSD in OSTargets.h

---
 clang/lib/Basic/Targets/OSTargets.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/clang/lib/Basic/Targets/OSTargets.h b/clang/lib/Basic/Targets/OSTargets.h
index 5dac699c2bb45..3731937905f0c 100644
--- a/clang/lib/Basic/Targets/OSTargets.h
+++ b/clang/lib/Basic/Targets/OSTargets.h
@@ -497,6 +497,7 @@ class LLVM_LIBRARY_VISIBILITY OpenBSDTargetInfo : public OSTargetInfo<Target> {
       this->MCountName = "_mcount";
       break;
     case llvm::Triple::riscv64:
+    case llvm::Triple::loongarch64:
       break;
     }
   }

>From 60da9e33b4d770eaa2e588643a35d03a2e07c546 Mon Sep 17 00:00:00 2001
From: "Slava \"nerfur\" Voronzoff" <nerfur at gmail.com>
Date: Tue, 1 Jul 2025 20:12:21 +0300
Subject: [PATCH 3/5] OpenBSD in Targets.cpp

---
 clang/lib/Basic/Targets.cpp | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 354c72a9eb110..5d11578893c66 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -752,9 +752,6 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
     case llvm::Triple::Linux:
       return std::make_unique<LinuxTargetInfo<LoongArch32TargetInfo>>(Triple,
                                                                       Opts);
-    case llvm::Triple::OpenBSD:
-      return std::make_unique<OpenBSDTargetInfo<LoongArch32TargetInfo>>(Triple,
-                                                                        Opts);
     default:
       return std::make_unique<LoongArch32TargetInfo>(Triple, Opts);
     }

>From 9d5b9c7b8c9081d9dc0542a4b22d2dda1235bb7f Mon Sep 17 00:00:00 2001
From: "Slava \"nerfur\" Voronzoff" <nerfur at gmail.com>
Date: Tue, 1 Jul 2025 20:19:06 +0300
Subject: [PATCH 4/5] LoongArch on OpenBSD.cpp

---
 clang/lib/Driver/ToolChains/OpenBSD.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/clang/lib/Driver/ToolChains/OpenBSD.cpp b/clang/lib/Driver/ToolChains/OpenBSD.cpp
index 79b1b6960da1f..05d9242a080a9 100644
--- a/clang/lib/Driver/ToolChains/OpenBSD.cpp
+++ b/clang/lib/Driver/ToolChains/OpenBSD.cpp
@@ -167,6 +167,12 @@ void openbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       CmdArgs.push_back("--no-relax");
   }
 
+  if (Triple.isLoongArch64()) {
+    CmdArgs.push_back("-X");
+    if (Args.hasArg(options::OPT_mno_relax))
+      CmdArgs.push_back("--no-relax");
+  }
+  
   assert((Output.isFilename() || Output.isNothing()) && "Invalid output.");
   if (Output.isFilename()) {
     CmdArgs.push_back("-o");

>From d1a94a51df2c73458e901d2ca3f124307c8fbdcd Mon Sep 17 00:00:00 2001
From: "Slava \"nerfur\" Voronzoff" <nerfur at gmail.com>
Date: Tue, 8 Jul 2025 16:18:38 +0300
Subject: [PATCH 5/5] Openbsd loongarch on openbsd.c

---
 clang/test/Driver/openbsd.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/clang/test/Driver/openbsd.c b/clang/test/Driver/openbsd.c
index 6639e9d2d9d67..0c76249143214 100644
--- a/clang/test/Driver/openbsd.c
+++ b/clang/test/Driver/openbsd.c
@@ -29,6 +29,19 @@
 // CHECK-MIPS64-CPU: "-target-cpu" "mips3"
 // CHECK-MIPS64EL-CPU: "-target-cpu" "mips3"
 
+// Check that LoongArch passes the correct linker emulation.
+//
+// RUN: %clang --target=loongarch64-unknown-openbsd -### %s %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-LA64-LD %s
+// CHECK-LA64-LD: ld{{.*}}" {{.*}} "-m" "elf64loongarch"
+//
+// Check options passed to the linker on LoongArch
+//
+// RUN: %clang --target=loongarch64-unknown-openbsd -mno-relax -### %s %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-LA64-LD-OPTS %s
+// CHECK-LA64-LD-OPTS: ld{{.*}}" {{.*}} "-X" "--no-relax"
+//
+
 // Check that the new linker flags are passed to OpenBSD
 // RUN: %clang --target=i686-pc-openbsd -r -### %s 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-LD-R %s