Index: clang/lib/Basic/Targets.cpp
===================================================================
--- clang/lib/Basic/Targets.cpp
+++ clang/lib/Basic/Targets.cpp
@@ -332,6 +332,8 @@
       return new OpenBSDTargetInfo<PPC32TargetInfo>(Triple, Opts);
     case llvm::Triple::RTEMS:
       return new RTEMSTargetInfo<PPC32TargetInfo>(Triple, Opts);
+    case llvm::Triple::AIX:
+      return new AIXPPC32TargetInfo(Triple, Opts);
     default:
       return new PPC32TargetInfo(Triple, Opts);
     }
@@ -348,6 +350,8 @@
       return new FreeBSDTargetInfo<PPC64TargetInfo>(Triple, Opts);
     case llvm::Triple::NetBSD:
       return new NetBSDTargetInfo<PPC64TargetInfo>(Triple, Opts);
+    case llvm::Triple::AIX:
+      return new AIXPPC64TargetInfo(Triple, Opts);
     default:
       return new PPC64TargetInfo(Triple, Opts);
     }
Index: clang/lib/Basic/Targets/OSTargets.h
===================================================================
--- clang/lib/Basic/Targets/OSTargets.h
+++ clang/lib/Basic/Targets/OSTargets.h
@@ -613,6 +613,49 @@
   }
 };
 
+// AIX Target
+template <typename Target>
+class AIXTargetInfo : public OSTargetInfo<Target> {
+protected:
+  void getOSDefines(const LangOptions &Opts, const llvm::Triple &Triple,
+                    MacroBuilder &Builder) const override {
+    DefineStd(Builder, "unix", Opts);
+    Builder.defineMacro("_IBMR2");
+    Builder.defineMacro("_POWER");
+    
+    // FIXME: Define AIX OS-Version Macros
+    Builder.defineMacro("_AIX");
+   
+    // FIXME: Determine the proper way for users to select the no-long-long 
+    // version of the standard library
+    Builder.defineMacro("_LONG_LONG");
+
+    if (this->PointerWidth == 64) {
+      Builder.defineMacro("__64BIT__");
+    }
+
+    // Define _WCHAR_T only for C++
+    if (Opts.CPlusPlus && Opts.WChar) {
+      Builder.defineMacro("_WCHAR_T");
+    }
+  }
+
+public:
+  AIXTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
+      : OSTargetInfo<Target>(Triple, Opts) {
+    if (this->PointerWidth == 64) {
+      this->WCharType = this->UnsignedInt;
+    } else {
+      this->WCharType = this->UnsignedShort;
+    }
+    this->UseZeroLengthBitfieldAlignment = true;
+  }
+ 
+  // AIX sets FLT_EVAL_METHOD to be 1
+  unsigned getFloatEvalMethod() const override { return 1; }
+  bool hasInt128Type() const override { return false; }
+};
+
 // Windows target
 template <typename Target>
 class LLVM_LIBRARY_VISIBILITY WindowsTargetInfo : public OSTargetInfo<Target> {
Index: clang/lib/Basic/Targets/PPC.h
===================================================================
--- clang/lib/Basic/Targets/PPC.h
+++ clang/lib/Basic/Targets/PPC.h
@@ -325,6 +325,12 @@
       PtrDiffType = SignedInt;
       IntPtrType = SignedInt;
       break;
+    case llvm::Triple::AIX:
+      SizeType = UnsignedLong;
+      PtrDiffType = SignedLong;
+      IntPtrType = SignedLong;
+      SuitableAlign = 64;
+      break;
     default:
       break;
     }
@@ -333,6 +339,8 @@
     case llvm::Triple::FreeBSD:
     case llvm::Triple::NetBSD:
     case llvm::Triple::OpenBSD:
+    // FIXME: -mlong-double-128 is not yet supported on AIX.
+    case llvm::Triple::AIX:
       LongDoubleWidth = LongDoubleAlign = 64;
       LongDoubleFormat = &llvm::APFloat::IEEEdouble();
       break;
@@ -373,6 +381,12 @@
       LongDoubleWidth = LongDoubleAlign = 64;
       LongDoubleFormat = &llvm::APFloat::IEEEdouble();
       break;
+    case llvm::Triple::AIX:
+      // FIXME: -mlong-double-128 is not yet supported on AIX.
+      LongDoubleWidth = LongDoubleAlign = 64;
+      LongDoubleFormat = &llvm::APFloat::IEEEdouble();
+      SuitableAlign = 64;
+      break;
     default:
       break;
     }
@@ -431,6 +445,21 @@
   }
 };
 
+class LLVM_LIBRARY_VISIBILITY AIXPPC32TargetInfo :
+  public AIXTargetInfo<PPC32TargetInfo> {
+public:
+  using AIXTargetInfo::AIXTargetInfo;
+  BuiltinVaListKind getBuiltinVaListKind() const override {
+    return TargetInfo::CharPtrBuiltinVaList;
+  }
+};
+
+class LLVM_LIBRARY_VISIBILITY AIXPPC64TargetInfo :
+  public AIXTargetInfo<PPC64TargetInfo> {
+public:
+  using AIXTargetInfo::AIXTargetInfo;
+};
+
 } // namespace targets
 } // namespace clang
 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_PPC_H
Index: clang/lib/Basic/Targets/PPC.cpp
===================================================================
--- clang/lib/Basic/Targets/PPC.cpp
+++ clang/lib/Basic/Targets/PPC.cpp
@@ -100,7 +100,9 @@
     Builder.defineMacro("_CALL_LINUX", "1");
 
   // Subtarget options.
-  Builder.defineMacro("__NATURAL_ALIGNMENT__");
+  if (!getTriple().isOSAIX()){
+    Builder.defineMacro("__NATURAL_ALIGNMENT__");
+  }
   Builder.defineMacro("__REGISTER_PREFIX__", "");
 
   // FIXME: Should be controlled by command line option.
Index: clang/test/Driver/types.c
===================================================================
--- clang/test/Driver/types.c
+++ clang/test/Driver/types.c
@@ -9,6 +9,12 @@
 // RUN: not %clang -c --target=riscv32-unknown-linux-gnu -fsyntax-only %s \
 // RUN: -fforce-enable-int128 -fno-force-enable-int128
 
+// RUN: not %clang -c --target=powerpc-ibm-aix -fsyntax-only %s \
+// RUN: 2>&1 | FileCheck %s
+
+// RUN: not %clang -c --target=powerpc64-ibm-aix -fsyntax-only %s \
+// RUN: 2>&1 | FileCheck %s
+
 void a() {
   __int128_t s;
   __uint128_t t;
Index: clang/test/Headers/max_align.c
===================================================================
--- /dev/null
+++ clang/test/Headers/max_align.c
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+#ifndef __BIGGEST_ALIGNMENT__
+#error __BIGGEST_ALIGNMENT__ not defined
+#endif
+
+#include <stddef.h>
+
+_Static_assert(__BIGGEST_ALIGNMENT__ == _Alignof(max_align_t), "");
Index: clang/test/Preprocessor/init.c
===================================================================
--- clang/test/Preprocessor/init.c
+++ clang/test/Preprocessor/init.c
@@ -6409,6 +6409,205 @@
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64-none-none -target-feature +float128 -target-cpu power9 -fno-signed-char < /dev/null | FileCheck -check-prefix PPC-FLOAT128 %s
 // PPC-FLOAT128:#define __FLOAT128__ 1
 //
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64-ibm-aix7.1.0.0 -fno-signed-char < /dev/null | FileCheck -match-full-lines -check-prefix PPC64-AIX %s
+//
+// PPC64-AIX:#define _AIX 1
+// PPC64-AIX:#define _ARCH_PPC 1
+// PPC64-AIX:#define _ARCH_PPC64 1
+// PPC64-AIX:#define _BIG_ENDIAN 1
+// PPC64-AIX:#define _IBMR2 1
+// PPC64-AIX:#define _LONG_LONG 1
+// PPC64-AIX:#define _POWER 1
+// PPC64-AIX:#define __64BIT__ 1
+// PPC64-AIX:#define __BIGGEST_ALIGNMENT__ 8 
+// PPC64-AIX:#define __BIG_ENDIAN__ 1
+// PPC64-AIX:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
+// PPC64-AIX:#define __CHAR16_TYPE__ unsigned short
+// PPC64-AIX:#define __CHAR32_TYPE__ unsigned int
+// PPC64-AIX:#define __CHAR_BIT__ 8
+// PPC64-AIX:#define __CHAR_UNSIGNED__ 1
+// PPC64-AIX:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
+// PPC64-AIX:#define __DBL_DIG__ 15
+// PPC64-AIX:#define __DBL_EPSILON__ 2.2204460492503131e-16
+// PPC64-AIX:#define __DBL_HAS_DENORM__ 1
+// PPC64-AIX:#define __DBL_HAS_INFINITY__ 1
+// PPC64-AIX:#define __DBL_HAS_QUIET_NAN__ 1
+// PPC64-AIX:#define __DBL_MANT_DIG__ 53
+// PPC64-AIX:#define __DBL_MAX_10_EXP__ 308
+// PPC64-AIX:#define __DBL_MAX_EXP__ 1024
+// PPC64-AIX:#define __DBL_MAX__ 1.7976931348623157e+308
+// PPC64-AIX:#define __DBL_MIN_10_EXP__ (-307)
+// PPC64-AIX:#define __DBL_MIN_EXP__ (-1021)
+// PPC64-AIX:#define __DBL_MIN__ 2.2250738585072014e-308
+// PPC64-AIX:#define __DECIMAL_DIG__ __LDBL_DECIMAL_DIG__
+// PPC64-AIX:#define __FLT_DENORM_MIN__ 1.40129846e-45F
+// PPC64-AIX:#define __FLT_DIG__ 6
+// PPC64-AIX:#define __FLT_EPSILON__ 1.19209290e-7F
+// PPC64-AIX:#define __FLT_EVAL_METHOD__ 1  
+// PPC64-AIX:#define __FLT_HAS_DENORM__ 1
+// PPC64-AIX:#define __FLT_HAS_INFINITY__ 1
+// PPC64-AIX:#define __FLT_HAS_QUIET_NAN__ 1
+// PPC64-AIX:#define __FLT_MANT_DIG__ 24
+// PPC64-AIX:#define __FLT_MAX_10_EXP__ 38
+// PPC64-AIX:#define __FLT_MAX_EXP__ 128
+// PPC64-AIX:#define __FLT_MAX__ 3.40282347e+38F
+// PPC64-AIX:#define __FLT_MIN_10_EXP__ (-37)
+// PPC64-AIX:#define __FLT_MIN_EXP__ (-125)
+// PPC64-AIX:#define __FLT_MIN__ 1.17549435e-38F
+// PPC64-AIX:#define __FLT_RADIX__ 2
+// PPC64-AIX:#define __INT16_C_SUFFIX__
+// PPC64-AIX:#define __INT16_FMTd__ "hd"
+// PPC64-AIX:#define __INT16_FMTi__ "hi"
+// PPC64-AIX:#define __INT16_MAX__ 32767
+// PPC64-AIX:#define __INT16_TYPE__ short
+// PPC64-AIX:#define __INT32_C_SUFFIX__
+// PPC64-AIX:#define __INT32_FMTd__ "d"
+// PPC64-AIX:#define __INT32_FMTi__ "i"
+// PPC64-AIX:#define __INT32_MAX__ 2147483647
+// PPC64-AIX:#define __INT32_TYPE__ int
+// PPC64-AIX:#define __INT64_C_SUFFIX__ L
+// PPC64-AIX:#define __INT64_FMTd__ "ld"
+// PPC64-AIX:#define __INT64_FMTi__ "li"
+// PPC64-AIX:#define __INT64_MAX__ 9223372036854775807L
+// PPC64-AIX:#define __INT64_TYPE__ long int
+// PPC64-AIX:#define __INT8_C_SUFFIX__
+// PPC64-AIX:#define __INT8_FMTd__ "hhd"
+// PPC64-AIX:#define __INT8_FMTi__ "hhi"
+// PPC64-AIX:#define __INT8_MAX__ 127
+// PPC64-AIX:#define __INT8_TYPE__ signed char
+// PPC64-AIX:#define __INTMAX_C_SUFFIX__ L
+// PPC64-AIX:#define __INTMAX_FMTd__ "ld"
+// PPC64-AIX:#define __INTMAX_FMTi__ "li"
+// PPC64-AIX:#define __INTMAX_MAX__ 9223372036854775807L
+// PPC64-AIX:#define __INTMAX_TYPE__ long int
+// PPC64-AIX:#define __INTMAX_WIDTH__ 64
+// PPC64-AIX:#define __INTPTR_FMTd__ "ld"
+// PPC64-AIX:#define __INTPTR_FMTi__ "li"
+// PPC64-AIX:#define __INTPTR_MAX__ 9223372036854775807L
+// PPC64-AIX:#define __INTPTR_TYPE__ long int
+// PPC64-AIX:#define __INTPTR_WIDTH__ 64
+// PPC64-AIX:#define __INT_FAST16_FMTd__ "hd"
+// PPC64-AIX:#define __INT_FAST16_FMTi__ "hi"
+// PPC64-AIX:#define __INT_FAST16_MAX__ 32767
+// PPC64-AIX:#define __INT_FAST16_TYPE__ short
+// PPC64-AIX:#define __INT_FAST32_FMTd__ "d"
+// PPC64-AIX:#define __INT_FAST32_FMTi__ "i"
+// PPC64-AIX:#define __INT_FAST32_MAX__ 2147483647
+// PPC64-AIX:#define __INT_FAST32_TYPE__ int
+// PPC64-AIX:#define __INT_FAST64_FMTd__ "ld"
+// PPC64-AIX:#define __INT_FAST64_FMTi__ "li"
+// PPC64-AIX:#define __INT_FAST64_MAX__ 9223372036854775807L
+// PPC64-AIX:#define __INT_FAST64_TYPE__ long int
+// PPC64-AIX:#define __INT_FAST8_FMTd__ "hhd"
+// PPC64-AIX:#define __INT_FAST8_FMTi__ "hhi"
+// PPC64-AIX:#define __INT_FAST8_MAX__ 127
+// PPC64-AIX:#define __INT_FAST8_TYPE__ signed char
+// PPC64-AIX:#define __INT_LEAST16_FMTd__ "hd"
+// PPC64-AIX:#define __INT_LEAST16_FMTi__ "hi"
+// PPC64-AIX:#define __INT_LEAST16_MAX__ 32767
+// PPC64-AIX:#define __INT_LEAST16_TYPE__ short
+// PPC64-AIX:#define __INT_LEAST32_FMTd__ "d"
+// PPC64-AIX:#define __INT_LEAST32_FMTi__ "i"
+// PPC64-AIX:#define __INT_LEAST32_MAX__ 2147483647
+// PPC64-AIX:#define __INT_LEAST32_TYPE__ int
+// PPC64-AIX:#define __INT_LEAST64_FMTd__ "ld"
+// PPC64-AIX:#define __INT_LEAST64_FMTi__ "li"
+// PPC64-AIX:#define __INT_LEAST64_MAX__ 9223372036854775807L
+// PPC64-AIX:#define __INT_LEAST64_TYPE__ long int
+// PPC64-AIX:#define __INT_LEAST8_FMTd__ "hhd"
+// PPC64-AIX:#define __INT_LEAST8_FMTi__ "hhi"
+// PPC64-AIX:#define __INT_LEAST8_MAX__ 127
+// PPC64-AIX:#define __INT_LEAST8_TYPE__ signed char
+// PPC64-AIX:#define __INT_MAX__ 2147483647
+// PPC64-AIX:#define __LDBL_DECIMAL_DIG__ 17
+// PPC64-AIX:#define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L 
+// PPC64-AIX:#define __LDBL_DIG__ 15 
+// PPC64-AIX:#define __LDBL_EPSILON__ 2.2204460492503131e-16L 
+// PPC64-AIX:#define __LDBL_HAS_DENORM__ 1
+// PPC64-AIX:#define __LDBL_HAS_INFINITY__ 1
+// PPC64-AIX:#define __LDBL_HAS_QUIET_NAN__ 1
+// PPC64-AIX:#define __LDBL_MANT_DIG__ 53 
+// PPC64-AIX:#define __LDBL_MAX_10_EXP__ 308
+// PPC64-AIX:#define __LDBL_MAX_EXP__ 1024
+// PPC64-AIX:#define __LDBL_MAX__ 1.7976931348623157e+308L 
+// PPC64-AIX:#define __LDBL_MIN_10_EXP__ (-307)
+// PPC64-AIX:#define __LDBL_MIN_EXP__ (-1021)
+// PPC64-AIX:#define __LDBL_MIN__ 2.2250738585072014e-308L
+// PPC64-AIX:#define __LONG_LONG_MAX__ 9223372036854775807LL
+// PPC64-AIX:#define __LONG_MAX__ 9223372036854775807L
+// PPC64-AIX-NOT:#define __NATURAL_ALIGNMENT__ 1
+// PPC64-AIX:#define __POINTER_WIDTH__ 64
+// PPC64-AIX:#define __POWERPC__ 1
+// PPC64-AIX:#define __PPC64__ 1
+// PPC64-AIX:#define __PPC__ 1
+// PPC64-AIX:#define __PTRDIFF_TYPE__ long int
+// PPC64-AIX:#define __PTRDIFF_WIDTH__ 64
+// PPC64-AIX:#define __REGISTER_PREFIX__
+// PPC64-AIX:#define __SCHAR_MAX__ 127
+// PPC64-AIX:#define __SHRT_MAX__ 32767
+// PPC64-AIX:#define __SIG_ATOMIC_MAX__ 2147483647
+// PPC64-AIX:#define __SIG_ATOMIC_WIDTH__ 32
+// PPC64-AIX:#define __SIZEOF_DOUBLE__ 8
+// PPC64-AIX:#define __SIZEOF_FLOAT__ 4
+// PPC64-AIX:#define __SIZEOF_INT__ 4
+// PPC64-AIX:#define __SIZEOF_LONG_DOUBLE__ 8 
+// PPC64-AIX:#define __SIZEOF_LONG_LONG__ 8
+// PPC64-AIX:#define __SIZEOF_LONG__ 8
+// PPC64-AIX:#define __SIZEOF_POINTER__ 8
+// PPC64-AIX:#define __SIZEOF_PTRDIFF_T__ 8
+// PPC64-AIX:#define __SIZEOF_SHORT__ 2
+// PPC64-AIX:#define __SIZEOF_SIZE_T__ 8
+// PPC64-AIX:#define __SIZEOF_WCHAR_T__ 4
+// PPC64-AIX:#define __SIZEOF_WINT_T__ 4
+// PPC64-AIX:#define __SIZE_MAX__ 18446744073709551615UL
+// PPC64-AIX:#define __SIZE_TYPE__ long unsigned int
+// PPC64-AIX:#define __SIZE_WIDTH__ 64
+// PPC64-AIX:#define __UINT16_C_SUFFIX__
+// PPC64-AIX:#define __UINT16_MAX__ 65535
+// PPC64-AIX:#define __UINT16_TYPE__ unsigned short
+// PPC64-AIX:#define __UINT32_C_SUFFIX__ U
+// PPC64-AIX:#define __UINT32_MAX__ 4294967295U
+// PPC64-AIX:#define __UINT32_TYPE__ unsigned int
+// PPC64-AIX:#define __UINT64_C_SUFFIX__ UL
+// PPC64-AIX:#define __UINT64_MAX__ 18446744073709551615UL
+// PPC64-AIX:#define __UINT64_TYPE__ long unsigned int
+// PPC64-AIX:#define __UINT8_C_SUFFIX__
+// PPC64-AIX:#define __UINT8_MAX__ 255
+// PPC64-AIX:#define __UINT8_TYPE__ unsigned char
+// PPC64-AIX:#define __UINTMAX_C_SUFFIX__ UL
+// PPC64-AIX:#define __UINTMAX_MAX__ 18446744073709551615UL
+// PPC64-AIX:#define __UINTMAX_TYPE__ long unsigned int
+// PPC64-AIX:#define __UINTMAX_WIDTH__ 64
+// PPC64-AIX:#define __UINTPTR_MAX__ 18446744073709551615UL
+// PPC64-AIX:#define __UINTPTR_TYPE__ long unsigned int
+// PPC64-AIX:#define __UINTPTR_WIDTH__ 64
+// PPC64-AIX:#define __UINT_FAST16_MAX__ 65535
+// PPC64-AIX:#define __UINT_FAST16_TYPE__ unsigned short
+// PPC64-AIX:#define __UINT_FAST32_MAX__ 4294967295U
+// PPC64-AIX:#define __UINT_FAST32_TYPE__ unsigned int
+// PPC64-AIX:#define __UINT_FAST64_MAX__ 18446744073709551615UL
+// PPC64-AIX:#define __UINT_FAST64_TYPE__ long unsigned int
+// PPC64-AIX:#define __UINT_FAST8_MAX__ 255
+// PPC64-AIX:#define __UINT_FAST8_TYPE__ unsigned char
+// PPC64-AIX:#define __UINT_LEAST16_MAX__ 65535
+// PPC64-AIX:#define __UINT_LEAST16_TYPE__ unsigned short
+// PPC64-AIX:#define __UINT_LEAST32_MAX__ 4294967295U
+// PPC64-AIX:#define __UINT_LEAST32_TYPE__ unsigned int
+// PPC64-AIX:#define __UINT_LEAST64_MAX__ 18446744073709551615UL
+// PPC64-AIX:#define __UINT_LEAST64_TYPE__ long unsigned int
+// PPC64-AIX:#define __UINT_LEAST8_MAX__ 255
+// PPC64-AIX:#define __UINT_LEAST8_TYPE__ unsigned char
+// PPC64-AIX:#define __USER_LABEL_PREFIX__
+// PPC64-AIX:#define __WCHAR_MAX__ 4294967295U
+// PPC64-AIX:#define __WCHAR_TYPE__ unsigned int
+// PPC64-AIX:#define __WCHAR_WIDTH__ 32
+// PPC64-AIX:#define __WINT_TYPE__ int
+// PPC64-AIX:#define __WINT_WIDTH__ 32
+// PPC64-AIX:#define __powerpc64__ 1
+// PPC64-AIX:#define __powerpc__ 1
+// PPC64-AIX:#define __ppc64__ 1
+// PPC64-AIX:#define __ppc__ 1
+//
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc64-unknown-linux-gnu -fno-signed-char < /dev/null | FileCheck -match-full-lines -check-prefix PPC64-LINUX %s
 //
 // PPC64-LINUX:#define _ARCH_PPC 1
@@ -6817,6 +7016,209 @@
 // PPC:#define __WINT_WIDTH__ 32
 // PPC:#define __ppc__ 1
 //
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc-ibm-aix7.1.0.0 -fno-signed-char < /dev/null | FileCheck -match-full-lines -check-prefix PPC-AIX %s
+//
+// PPC-AIX:#define _AIX 1
+// PPC-AIX:#define _ARCH_PPC 1
+// PPC-AIX:#define _BIG_ENDIAN 1
+// PPC-AIX:#define _IBMR2 1
+// PPC-AIX:#define _LONG_LONG 1
+// PPC-AIX:#define _POWER 1
+// PPC-AIX:#define __BIGGEST_ALIGNMENT__ 8
+// PPC-AIX:#define __BIG_ENDIAN__ 1
+// PPC-AIX:#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
+// PPC-AIX:#define __CHAR16_TYPE__ unsigned short
+// PPC-AIX:#define __CHAR32_TYPE__ unsigned int
+// PPC-AIX:#define __CHAR_BIT__ 8
+// PPC-AIX:#define __CHAR_UNSIGNED__ 1
+// PPC-AIX:#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
+// PPC-AIX:#define __DBL_DIG__ 15
+// PPC-AIX:#define __DBL_EPSILON__ 2.2204460492503131e-16
+// PPC-AIX:#define __DBL_HAS_DENORM__ 1
+// PPC-AIX:#define __DBL_HAS_INFINITY__ 1
+// PPC-AIX:#define __DBL_HAS_QUIET_NAN__ 1
+// PPC-AIX:#define __DBL_MANT_DIG__ 53
+// PPC-AIX:#define __DBL_MAX_10_EXP__ 308
+// PPC-AIX:#define __DBL_MAX_EXP__ 1024
+// PPC-AIX:#define __DBL_MAX__ 1.7976931348623157e+308
+// PPC-AIX:#define __DBL_MIN_10_EXP__ (-307)
+// PPC-AIX:#define __DBL_MIN_EXP__ (-1021)
+// PPC-AIX:#define __DBL_MIN__ 2.2250738585072014e-308
+// PPC-AIX:#define __DECIMAL_DIG__ __LDBL_DECIMAL_DIG__
+// PPC-AIX:#define __FLT_DENORM_MIN__ 1.40129846e-45F
+// PPC-AIX:#define __FLT_DIG__ 6
+// PPC-AIX:#define __FLT_EPSILON__ 1.19209290e-7F
+// PPC-AIX:#define __FLT_EVAL_METHOD__ 1 
+// PPC-AIX:#define __FLT_HAS_DENORM__ 1
+// PPC-AIX:#define __FLT_HAS_INFINITY__ 1
+// PPC-AIX:#define __FLT_HAS_QUIET_NAN__ 1
+// PPC-AIX:#define __FLT_MANT_DIG__ 24
+// PPC-AIX:#define __FLT_MAX_10_EXP__ 38
+// PPC-AIX:#define __FLT_MAX_EXP__ 128
+// PPC-AIX:#define __FLT_MAX__ 3.40282347e+38F
+// PPC-AIX:#define __FLT_MIN_10_EXP__ (-37)
+// PPC-AIX:#define __FLT_MIN_EXP__ (-125)
+// PPC-AIX:#define __FLT_MIN__ 1.17549435e-38F
+// PPC-AIX:#define __FLT_RADIX__ 2
+// PPC-AIX:#define __INT16_C_SUFFIX__
+// PPC-AIX:#define __INT16_FMTd__ "hd"
+// PPC-AIX:#define __INT16_FMTi__ "hi"
+// PPC-AIX:#define __INT16_MAX__ 32767
+// PPC-AIX:#define __INT16_TYPE__ short
+// PPC-AIX:#define __INT32_C_SUFFIX__
+// PPC-AIX:#define __INT32_FMTd__ "d"
+// PPC-AIX:#define __INT32_FMTi__ "i"
+// PPC-AIX:#define __INT32_MAX__ 2147483647
+// PPC-AIX:#define __INT32_TYPE__ int
+// PPC-AIX:#define __INT64_C_SUFFIX__ LL
+// PPC-AIX:#define __INT64_FMTd__ "lld"
+// PPC-AIX:#define __INT64_FMTi__ "lli"
+// PPC-AIX:#define __INT64_MAX__ 9223372036854775807LL
+// PPC-AIX:#define __INT64_TYPE__ long long int
+// PPC-AIX:#define __INT8_C_SUFFIX__
+// PPC-AIX:#define __INT8_FMTd__ "hhd"
+// PPC-AIX:#define __INT8_FMTi__ "hhi"
+// PPC-AIX:#define __INT8_MAX__ 127
+// PPC-AIX:#define __INT8_TYPE__ signed char
+// PPC-AIX:#define __INTMAX_C_SUFFIX__ LL
+// PPC-AIX:#define __INTMAX_FMTd__ "lld"
+// PPC-AIX:#define __INTMAX_FMTi__ "lli"
+// PPC-AIX:#define __INTMAX_MAX__ 9223372036854775807LL
+// PPC-AIX:#define __INTMAX_TYPE__ long long int
+// PPC-AIX:#define __INTMAX_WIDTH__ 64
+// PPC-AIX:#define __INTPTR_FMTd__ "ld"
+// PPC-AIX:#define __INTPTR_FMTi__ "li"
+// PPC-AIX:#define __INTPTR_MAX__ 2147483647L 
+// PPC-AIX:#define __INTPTR_TYPE__ long int
+// PPC-AIX:#define __INTPTR_WIDTH__ 32 
+// PPC-AIX:#define __INT_FAST16_FMTd__ "hd"
+// PPC-AIX:#define __INT_FAST16_FMTi__ "hi"
+// PPC-AIX:#define __INT_FAST16_MAX__ 32767
+// PPC-AIX:#define __INT_FAST16_TYPE__ short
+// PPC-AIX:#define __INT_FAST32_FMTd__ "d"
+// PPC-AIX:#define __INT_FAST32_FMTi__ "i"
+// PPC-AIX:#define __INT_FAST32_MAX__ 2147483647
+// PPC-AIX:#define __INT_FAST32_TYPE__ int
+// PPC-AIX:#define __INT_FAST64_FMTd__ "lld"
+// PPC-AIX:#define __INT_FAST64_FMTi__ "lli"
+// PPC-AIX:#define __INT_FAST64_MAX__ 9223372036854775807LL
+// PPC-AIX:#define __INT_FAST64_TYPE__ long long int
+// PPC-AIX:#define __INT_FAST8_FMTd__ "hhd"
+// PPC-AIX:#define __INT_FAST8_FMTi__ "hhi"
+// PPC-AIX:#define __INT_FAST8_MAX__ 127
+// PPC-AIX:#define __INT_FAST8_TYPE__ signed char
+// PPC-AIX:#define __INT_LEAST16_FMTd__ "hd"
+// PPC-AIX:#define __INT_LEAST16_FMTi__ "hi"
+// PPC-AIX:#define __INT_LEAST16_MAX__ 32767
+// PPC-AIX:#define __INT_LEAST16_TYPE__ short
+// PPC-AIX:#define __INT_LEAST32_FMTd__ "d"
+// PPC-AIX:#define __INT_LEAST32_FMTi__ "i"
+// PPC-AIX:#define __INT_LEAST32_MAX__ 2147483647
+// PPC-AIX:#define __INT_LEAST32_TYPE__ int
+// PPC-AIX:#define __INT_LEAST64_FMTd__ "lld"
+// PPC-AIX:#define __INT_LEAST64_FMTi__ "lli"
+// PPC-AIX:#define __INT_LEAST64_MAX__ 9223372036854775807LL
+// PPC-AIX:#define __INT_LEAST64_TYPE__ long long int
+// PPC-AIX:#define __INT_LEAST8_FMTd__ "hhd"
+// PPC-AIX:#define __INT_LEAST8_FMTi__ "hhi"
+// PPC-AIX:#define __INT_LEAST8_MAX__ 127
+// PPC-AIX:#define __INT_LEAST8_TYPE__ signed char
+// PPC-AIX:#define __INT_MAX__ 2147483647
+// PPC-AIX:#define __LDBL_DECIMAL_DIG__ 17
+// PPC-AIX:#define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L 
+// PPC-AIX:#define __LDBL_DIG__ 15 
+// PPC-AIX:#define __LDBL_EPSILON__ 2.2204460492503131e-16L 
+// PPC-AIX:#define __LDBL_HAS_DENORM__ 1
+// PPC-AIX:#define __LDBL_HAS_INFINITY__ 1
+// PPC-AIX:#define __LDBL_HAS_QUIET_NAN__ 1
+// PPC-AIX:#define __LDBL_MANT_DIG__ 53 
+// PPC-AIX:#define __LDBL_MAX_10_EXP__ 308
+// PPC-AIX:#define __LDBL_MAX_EXP__ 1024
+// PPC-AIX:#define __LDBL_MAX__ 1.7976931348623157e+308L 
+// PPC-AIX:#define __LDBL_MIN_10_EXP__ (-307)
+// PPC-AIX:#define __LDBL_MIN_EXP__ (-1021)
+// PPC-AIX:#define __LDBL_MIN__ 2.2250738585072014e-308L 
+// PPC-AIX:#define __LONG_LONG_MAX__ 9223372036854775807LL
+// PPC-AIX:#define __LONG_MAX__ 2147483647L
+// PPC-AIX-NOT:#define __NATURAL_ALIGNMENT__ 1
+// PPC-AIX:#define __POINTER_WIDTH__ 32
+// PPC-AIX:#define __POWERPC__ 1
+// PPC-AIX:#define __PPC__ 1
+// PPC-AIX:#define __PTRDIFF_TYPE__ long int
+// PPC-AIX:#define __PTRDIFF_WIDTH__ 32 
+// PPC-AIX:#define __REGISTER_PREFIX__
+// PPC-AIX:#define __SCHAR_MAX__ 127
+// PPC-AIX:#define __SHRT_MAX__ 32767
+// PPC-AIX:#define __SIG_ATOMIC_MAX__ 2147483647
+// PPC-AIX:#define __SIG_ATOMIC_WIDTH__ 32
+// PPC-AIX:#define __SIZEOF_DOUBLE__ 8
+// PPC-AIX:#define __SIZEOF_FLOAT__ 4
+// PPC-AIX:#define __SIZEOF_INT__ 4
+// PPC-AIX:#define __SIZEOF_LONG_DOUBLE__ 8 
+// PPC-AIX:#define __SIZEOF_LONG_LONG__ 8
+// PPC-AIX:#define __SIZEOF_LONG__ 4
+// PPC-AIX:#define __SIZEOF_POINTER__ 4
+// PPC-AIX:#define __SIZEOF_PTRDIFF_T__ 4
+// PPC-AIX:#define __SIZEOF_SHORT__ 2
+// PPC-AIX:#define __SIZEOF_SIZE_T__ 4
+// PPC-AIX:#define __SIZEOF_WCHAR_T__ 2 
+// PPC-AIX:#define __SIZEOF_WINT_T__ 4
+// PPC-AIX:#define __SIZE_MAX__ 4294967295UL 
+// PPC-AIX:#define __SIZE_TYPE__ long unsigned int
+// PPC-AIX:#define __SIZE_WIDTH__ 32
+// PPC-AIX:#define __UINT16_C_SUFFIX__
+// PPC-AIX:#define __UINT16_MAX__ 65535
+// PPC-AIX:#define __UINT16_TYPE__ unsigned short
+// PPC-AIX:#define __UINT32_C_SUFFIX__ U
+// PPC-AIX:#define __UINT32_MAX__ 4294967295U
+// PPC-AIX:#define __UINT32_TYPE__ unsigned int
+// PPC-AIX:#define __UINT64_C_SUFFIX__ ULL
+// PPC-AIX:#define __UINT64_MAX__ 18446744073709551615ULL
+// PPC-AIX:#define __UINT64_TYPE__ long long unsigned int
+// PPC-AIX:#define __UINT8_C_SUFFIX__
+// PPC-AIX:#define __UINT8_MAX__ 255
+// PPC-AIX:#define __UINT8_TYPE__ unsigned char
+// PPC-AIX:#define __UINTMAX_C_SUFFIX__ ULL
+// PPC-AIX:#define __UINTMAX_MAX__ 18446744073709551615ULL
+// PPC-AIX:#define __UINTMAX_TYPE__ long long unsigned int
+// PPC-AIX:#define __UINTMAX_WIDTH__ 64
+// PPC-AIX:#define __UINTPTR_MAX__ 4294967295UL
+// PPC-AIX:#define __UINTPTR_TYPE__ long unsigned int
+// PPC-AIX:#define __UINTPTR_WIDTH__ 32
+// PPC-AIX:#define __UINT_FAST16_MAX__ 65535
+// PPC-AIX:#define __UINT_FAST16_TYPE__ unsigned short
+// PPC-AIX:#define __UINT_FAST32_MAX__ 4294967295U
+// PPC-AIX:#define __UINT_FAST32_TYPE__ unsigned int
+// PPC-AIX:#define __UINT_FAST64_MAX__ 18446744073709551615ULL
+// PPC-AIX:#define __UINT_FAST64_TYPE__ long long unsigned int
+// PPC-AIX:#define __UINT_FAST8_MAX__ 255
+// PPC-AIX:#define __UINT_FAST8_TYPE__ unsigned char
+// PPC-AIX:#define __UINT_LEAST16_MAX__ 65535
+// PPC-AIX:#define __UINT_LEAST16_TYPE__ unsigned short
+// PPC-AIX:#define __UINT_LEAST32_MAX__ 4294967295U
+// PPC-AIX:#define __UINT_LEAST32_TYPE__ unsigned int
+// PPC-AIX:#define __UINT_LEAST64_MAX__ 18446744073709551615ULL
+// PPC-AIX:#define __UINT_LEAST64_TYPE__ long long unsigned int
+// PPC-AIX:#define __UINT_LEAST8_MAX__ 255
+// PPC-AIX:#define __UINT_LEAST8_TYPE__ unsigned char
+// PPC-AIX:#define __USER_LABEL_PREFIX__
+// PPC-AIX:#define __WCHAR_MAX__ 65535
+// PPC-AIX:#define __WCHAR_TYPE__ unsigned short
+// PPC-AIX:#define __WCHAR_WIDTH__ 16
+// PPC-AIX:#define __WINT_TYPE__ int
+// PPC-AIX:#define __WINT_WIDTH__ 32
+// PPC-AIX:#define __powerpc__ 1
+// PPC-AIX:#define __ppc__ 1
+//
+// RUN: %clang_cc1 -x c++ -E -dM -ffreestanding -triple=powerpc-ibm-aix7.1.0.0 -fno-signed-char < /dev/null | FileCheck -match-full-lines -check-prefix PPC-AIX-CXX %s
+//
+// PPC-AIX-CXX:#define _WCHAR_T 1
+//
+// RUN: %clang_cc1 -x c++ -fno-wchar -E -dM -ffreestanding -triple=powerpc-ibm-aix7.1.0.0 < /dev/null | FileCheck -match-full-lines -check-prefix PPC-AIX-NOWCHAR %s
+// RUN: %clang_cc1 -x c -E -dM -ffreestanding -triple=powerpc-ibm-aix7.1.0.0 < /dev/null | FileCheck -match-full-lines -check-prefix PPC-AIX-NOWCHAR %s
+// 
+// PPC-AIX-NOWCHAR-NOT:#define _WCHAR_T 1
+//
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=powerpc-unknown-linux-gnu -fno-signed-char < /dev/null | FileCheck -match-full-lines -check-prefix PPC-LINUX %s
 //
 // PPC-LINUX:#define _ARCH_PPC 1
Index: clang/test/Sema/varargs-aix.c
===================================================================
--- /dev/null
+++ clang/test/Sema/varargs-aix.c
@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s -triple powerpc-ibm-aix
+// RUN: %clang_cc1 -fsyntax-only -verify %s -triple powerpc64-ibm-aix
+// expected-no-diagnostics
+
+extern __builtin_va_list ap;
+extern char *ap;