[RISCV] Add FreeBSD targets

Reviewers: asb

Reviewed By: asb

Subscribers: simoncook, s.egerton, lenary, psnobl, benna, mhorne, emaste, kito-cheng, shiva0217, rogfer01, rkruppe, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D57795

Patch by James Clarke (jrtc27)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@367557 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Basic/Targets.cpp

@@ -363,15 +363,26 @@ TargetInfo *AllocateTarget(const llvm::Triple &Triple,
     return new AMDGPUTargetInfo(Triple, Opts);
 
   case llvm::Triple::riscv32:
-    // TODO: add cases for FreeBSD, NetBSD, RTEMS once tested.
-    if (os == llvm::Triple::Linux)
+    // TODO: add cases for NetBSD, RTEMS once tested.
+    switch (os) {
+    case llvm::Triple::FreeBSD:
+      return new FreeBSDTargetInfo<RISCV32TargetInfo>(Triple, Opts);
+    case llvm::Triple::Linux:
       return new LinuxTargetInfo<RISCV32TargetInfo>(Triple, Opts);
-    return new RISCV32TargetInfo(Triple, Opts);
+    default:
+      return new RISCV32TargetInfo(Triple, Opts);
+    }
+
   case llvm::Triple::riscv64:
-    // TODO: add cases for FreeBSD, NetBSD, RTEMS once tested.
-    if (os == llvm::Triple::Linux)
+    // TODO: add cases for NetBSD, RTEMS once tested.
+    switch (os) {
+    case llvm::Triple::FreeBSD:
+      return new FreeBSDTargetInfo<RISCV64TargetInfo>(Triple, Opts);
+    case llvm::Triple::Linux:
       return new LinuxTargetInfo<RISCV64TargetInfo>(Triple, Opts);
-    return new RISCV64TargetInfo(Triple, Opts);
+    default:
+      return new RISCV64TargetInfo(Triple, Opts);
+    }
 
   case llvm::Triple::sparc:
     switch (os) {

lib/Driver/ToolChains/FreeBSD.cpp

@@ -197,6 +197,14 @@ void freebsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     else
       CmdArgs.push_back("elf64ltsmip_fbsd");
     break;
+  case llvm::Triple::riscv32:
+    CmdArgs.push_back("-m");
+    CmdArgs.push_back("elf32lriscv");
+    break;
+  case llvm::Triple::riscv64:
+    CmdArgs.push_back("-m");
+    CmdArgs.push_back("elf64lriscv");
+    break;
   default:
     break;
   }

test/Driver/freebsd.c

@@ -63,6 +63,15 @@
 // RUN:   | FileCheck --check-prefix=CHECK-MIPSN32EL-LD %s
 // CHECK-MIPSN32EL-LD: ld{{.*}}" {{.*}} "-m" "elf32ltsmipn32_fbsd"
 //
+// Check that RISC-V passes the correct linker emulation.
+//
+// RUN: %clang -target riscv32-freebsd %s -### %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV32I-LD %s
+// CHECK-RV32I-LD: ld{{.*}}" {{.*}} "-m" "elf32lriscv"
+// RUN: %clang -target riscv64-freebsd %s -### %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RV64I-LD %s
+// CHECK-RV64I-LD: ld{{.*}}" {{.*}} "-m" "elf64lriscv"
+//
 // Check that the new linker flags are passed to FreeBSD
 // RUN: %clang -no-canonical-prefixes -target x86_64-pc-freebsd8 -m32 %s \
 // RUN:   --sysroot=%S/Inputs/multiarch_freebsd64_tree -### 2>&1 \