Initial support for FreeBSD on ARM.

Patch by Andrew Turner.

llvm-svn: 170096

clang/lib/Basic/Targets.cpp

@@ -3094,7 +3094,9 @@ public:
     // name.
     if (Name == "apcs-gnu") {
       DoubleAlign = LongLongAlign = LongDoubleAlign = SuitableAlign = 32;
-      SizeType = UnsignedLong;
+      // size_t is unsigned int on FreeBSD.
+      if (getTriple().getOS() != llvm::Triple::FreeBSD)
+        SizeType = UnsignedLong;
 
       // Revert to using SignedInt on apcs-gnu to comply with existing behaviour.
       WCharType = SignedInt;

clang/lib/Driver/ToolChains.cpp

@@ -1861,6 +1861,19 @@ Tool &FreeBSD::SelectTool(const Compilation &C, const JobAction &JA,
   return *T;
 }
 
+bool FreeBSD::UseSjLjExceptions() const {
+  // FreeBSD uses SjLj exceptions on ARM oabi.
+  switch (getTriple().getEnvironment()) {
+  case llvm::Triple::GNUEABI:
+  case llvm::Triple::EABI:
+    return false;
+
+  default:
+    return (getTriple().getArch() == llvm::Triple::arm ||
+            getTriple().getArch() == llvm::Triple::thumb);
+  }
+}
+
 /// NetBSD - NetBSD tool chain which can call as(1) and ld(1) directly.
 
 NetBSD::NetBSD(const Driver &D, const llvm::Triple& Triple, const ArgList &Args)

clang/lib/Driver/ToolChains.h

@@ -452,6 +452,7 @@ public:
 
   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;
+  virtual bool UseSjLjExceptions() const;
 };
 
 class LLVM_LIBRARY_VISIBILITY NetBSD : public Generic_ELF {

clang/lib/Driver/Tools.cpp

@@ -662,6 +662,11 @@ static StringRef getARMFloatABI(const Driver &D,
       break;
     }
 
+    case llvm::Triple::FreeBSD:
+      // FreeBSD defaults to soft float
+      FloatABI = "soft";
+      break;
+
     default:
       switch(Triple.getEnvironment()) {
       case llvm::Triple::GNUEABIHF:
@@ -4944,6 +4949,17 @@ void freebsd::Assemble::ConstructJob(Compilation &C, const JobAction &JA,
          LastPICArg->getOption().matches(options::OPT_fpie))) {
       CmdArgs.push_back("-KPIC");
     }
+  } else if (getToolChain().getArch() == llvm::Triple::arm ||
+             getToolChain().getArch() == llvm::Triple::thumb) {
+    CmdArgs.push_back("-mfpu=softvfp");
+    switch(getToolChain().getTriple().getEnvironment()) {
+    case llvm::Triple::GNUEABI:
+    case llvm::Triple::EABI:
+      break;
+
+    default:
+      CmdArgs.push_back("-matpcs");
+    }
   }
 
   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA,

clang/test/Driver/freebsd.c

@@ -96,3 +96,14 @@
 // RUN:   | FileCheck --check-prefix=CHECK-NORMAL %s
 // CHECK-NORMAL: crt1.o
 // CHECK-NORMAL: crtbegin.o
+
+// RUN: %clang %s -### -o %t.o -target arm-unknown-freebsd10.0 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ARM %s
+// CHECK-ARM: clang{{.*}}" "-cc1"{{.*}}" "-fsjlj-exceptions"
+// CHECK-ARM: as{{.*}}" "-mfpu=softvfp"{{.*}}"-matpcs"
+
+// RUN: %clang %s -### -o %t.o -target arm-gnueabi-freebsd10.0 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ARM-EABI %s
+// CHECK-ARM-EABI-NOT: clang{{.*}}" "-cc1"{{.*}}" "-fsjlj-exceptions"
+// CHECK-ARM-EABI: as{{.*}}" "-mfpu=softvfp"
+// CHECK-ARM-EABI-NOT: as{{.*}}" "-matpcs"

clang/test/Misc/freebsd-arm-size_t.c

@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -triple arm-unknown-freebsd10.0 -verify %s
+// expected-no-diagnostics
+
+/* Define a size_t as expected for FreeBSD ARM */
+typedef unsigned int size_t;
+
+/* Declare a builtin function that uses size_t */
+void *malloc(size_t);
+