[PATCH] Use appropriate default PIE settings for OpenBSD

[Brad Smith]

This corrects the default PIE settings to match the behavior of our base
and ports GCC versions.

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Index: lib/Driver/Tools.cpp
===================================================================
--- lib/Driver/Tools.cpp	(revision 211236)
+++ lib/Driver/Tools.cpp	(working copy)
@@ -2429,6 +2429,27 @@
     }
   }
 
+  // OpenBSD-specific defaults for PIE
+  if (getToolChain().getTriple().getOS() == llvm::Triple::OpenBSD) {
+    switch (getToolChain().getTriple().getArch()) {
+    case llvm::Triple::mips64:
+    case llvm::Triple::mips64el:
+    case llvm::Triple::sparc:
+    case llvm::Triple::x86:
+    case llvm::Triple::x86_64:
+      IsPICLevelTwo = false; // "-fpie"
+      break;
+
+    case llvm::Triple::ppc:
+    case llvm::Triple::sparcv9:
+      IsPICLevelTwo = true; // "-fPIE"
+      break;
+
+    default:
+      break;
+    }
+  }
+
   // For the PIC and PIE flag options, this logic is different from the
   // legacy logic in very old versions of GCC, as that logic was just
   // a bug no one had ever fixed. This logic is both more rational and
Index: test/Driver/pic.c
===================================================================
--- test/Driver/pic.c	(revision 211236)
+++ test/Driver/pic.c	(working copy)
@@ -201,8 +201,18 @@
 // RUN:   | FileCheck %s --check-prefix=CHECK-NO-PIC
 //
 // On OpenBSD, PIE is enabled by default, but can be disabled.
+// RUN: %clang -c %s -target amd64-pc-openbsd -### 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=CHECK-PIE1
 // RUN: %clang -c %s -target i386-pc-openbsd -### 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=CHECK-PIE1
+// RUN: %clang -c %s -target mips64-unknown-openbsd -### 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=CHECK-PIE1
+// RUN: %clang -c %s -target mips64el-unknown-openbsd -### 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=CHECK-PIE1
+// RUN: %clang -c %s -target powerpc-unknown-openbsd -### 2>&1 \
 // RUN:   | FileCheck %s --check-prefix=CHECK-PIE2
+// RUN: %clang -c %s -target sparc64-unknown-openbsd -### 2>&1 \
+// RUN:   | FileCheck %s --check-prefix=CHECK-PIE2
 // RUN: %clang -c %s -target i386-pc-openbsd -fno-pie -### 2>&1 \
 // RUN:   | FileCheck %s --check-prefix=CHECK-NO-PIC
 //