Driver/Darwin/ARM: Kernel/kext code has more strict alignment requirements.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127815 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Driver/Tools.cpp

@@ -420,7 +420,8 @@ static bool isSignedCharDefault(const llvm::Triple &Triple) {
 }
 
 void Clang::AddARMTargetArgs(const ArgList &Args,
-                             ArgStringList &CmdArgs) const {
+                             ArgStringList &CmdArgs,
+                             bool KernelOrKext) const {
   const Driver &D = getToolChain().getDriver();
   llvm::Triple Triple = getToolChain().getTriple();
 
@@ -587,8 +588,17 @@ void Clang::AddARMTargetArgs(const ArgList &Args,
   // Setting -msoft-float effectively disables NEON because of the GCC
   // implementation, although the same isn't true of VFP or VFP3.
   if (FloatABI == "soft") {
-      CmdArgs.push_back("-target-feature");
-      CmdArgs.push_back("-neon");
+    CmdArgs.push_back("-target-feature");
+    CmdArgs.push_back("-neon");
+  }
+
+  // Kernel code has more strict alignment requirements.
+  if (KernelOrKext) {
+    CmdArgs.push_back("-target-feature");
+    CmdArgs.push_back("-arm-long-calls");
+
+    CmdArgs.push_back("-target-feature");
+    CmdArgs.push_back("-arm-strict-align");
   }
 }
 
@@ -1173,7 +1183,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
 
   case llvm::Triple::arm:
   case llvm::Triple::thumb:
-    AddARMTargetArgs(Args, CmdArgs);
+    AddARMTargetArgs(Args, CmdArgs, KernelOrKext);
     break;
 
   case llvm::Triple::mips:

lib/Driver/Tools.h

@@ -34,7 +34,8 @@ namespace tools {
                                  const InputInfo &Output,
                                  const InputInfoList &Inputs) const;
 
-    void AddARMTargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const;
+    void AddARMTargetArgs(const ArgList &Args, ArgStringList &CmdArgs,
+                          bool KernelOrKext) const;
     void AddMIPSTargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const;
     void AddSparcTargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const;
     void AddX86TargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const;

test/Driver/apple-kext-mkernel.c

@@ -1,6 +1,18 @@
-// RUN: %clang -ccc-host-triple x86_64-apple-darwin10 -mkernel -### -fsyntax-only %s 2> %t
-// RUN grep "-disable-red-zone" %t
-// RUN grep "-fapple-kext" %t
-// RUN grep "-fno-builtin" %t
-// RUN grep "-fno-rtti" %t
-// RUN grep "-fno-common" %t
+// RUN: %clang -ccc-host-triple x86_64-apple-darwin10 \
+// RUN:   -mkernel -### -fsyntax-only %s 2> %t
+// RUN: FileCheck --check-prefix=CHECK-X86 < %t %s
+
+// CHECK-X86: "-disable-red-zone"
+// CHECK-X86: "-fno-builtin"
+// CHECK-X86: "-fno-rtti"
+// CHECK-X86: "-fno-common"
+
+// RUN: %clang -ccc-host-triple x86_64-apple-darwin10 \
+// RUN:   -arch armv7 -mkernel -### -fsyntax-only %s 2> %t
+// RUN: FileCheck --check-prefix=CHECK-ARM < %t %s
+
+// CHECK-ARM: "-target-feature" "-arm-long-calls"
+// CHECK-ARM: "-target-feature" "-arm-strict-align"
+// CHECK-ARM: "-fno-builtin"
+// CHECK-ARM: "-fno-rtti"
+// CHECK-ARM: "-fno-common"