[PowerPC64] Starting from FreeBSD 13.0, default to ELFv2 ABI

This changes the LLVM default powerpc64 ABI to ELFv2, if target OS is
FreeBSD >= 13.0

This will also be sent upstream.

Submitted by:	alfredo.junior_eldorado.org.br
Reviewed by:	dim, luporl
Relnotes:	YES
Differential Revision:	https://reviews.freebsd.org/D20383

2 files changed, 33 insertions, 2 deletions

diff --git a/contrib/llvm-project/clang/lib/Basic/Targets/PPC.h b/contrib/llvm-project/clang/lib/Basic/Targets/PPC.h
index 6c6421c28e23..72a82f0ed7c7 100644
--- a/contrib/llvm-project/clang/lib/Basic/Targets/PPC.h
+++ b/contrib/llvm-project/clang/lib/Basic/Targets/PPC.h
@@ -375,12 +375,29 @@ public:
     IntMaxType = SignedLong;
     Int64Type = SignedLong;
 
+    if (Triple.getEnvironment() != llvm::Triple::UnknownEnvironment) {
+      switch (Triple.getEnvironment()){
+        case llvm::Triple::ELFv1:
+          ABI = "elfv1";
+          break;
+	default:
+          ABI = "elfv2";
+	break;
+      }
+    } else {
+      if ((Triple.getOS() == llvm::Triple::FreeBSD) &&
+	      (Triple.getOSMajorVersion() < 13)) {
+        ABI = "elfv1";
+      } else {
+        ABI = "elfv2";
+      }
+    }
+
+
     if ((Triple.getArch() == llvm::Triple::ppc64le)) {
       resetDataLayout("e-m:e-i64:64-n32:64");
-      ABI = "elfv2";
     } else {
       resetDataLayout("E-m:e-i64:64-n32:64");
-      ABI = Triple.getEnvironment() == llvm::Triple::ELFv2 ? "elfv2" : "elfv1";
     }
 
     if (Triple.getOS() == llvm::Triple::AIX)
diff --git a/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp b/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
index ce00f848dd72..356a08929682 100644
--- a/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -209,6 +209,20 @@ static PPCTargetMachine::PPCABI computeTargetABI(const Triple &TT,
   if (TT.isMacOSX())
     return PPCTargetMachine::PPC_ABI_UNKNOWN;
 
+  if (TT.isOSFreeBSD()) {
+    switch (TT.getArch()) {
+    case Triple::ppc64le:
+    case Triple::ppc64:
+      if (TT.getOSMajorVersion() >= 13)
+        return PPCTargetMachine::PPC_ABI_ELFv2;
+      else
+        return PPCTargetMachine::PPC_ABI_ELFv1;
+    case Triple::ppc:
+    default:
+      return PPCTargetMachine::PPC_ABI_UNKNOWN;
+    }
+  }
+
   switch (TT.getArch()) {
   case Triple::ppc64le:
     return PPCTargetMachine::PPC_ABI_ELFv2;