Add AVR target and toolchain to Clang

[saaadhu]

Summary

This patch adds barebones support in Clang for the (experimental) AVR target. It uses the integrated assembler for assembly, and the GNU linker for linking, as lld doesn't know about the target yet.

The DataLayout string is the same as the one in AVRTargetMachine.cpp. The alignment specs look wrong to me, as it's an 8 bit target and all types only need 8 bit alignment. Clang failed with a datalayout mismatch error when I tried to change it, so I left it that way for now.

[dylanmckay]

I'm quite happy with this (some minor code alignment issues), but I'd definitely like to see someone from the clang project look this over.

I'm not entirely sure if there's any policies regarding enabling clang for experimental backends.

lib/Driver/Driver.cpp

3755

Incorrect indentation on the break

lib/Driver/ToolChains.cpp

5292

Alignment

lib/Driver/ToolChains.h

1330

Alignment messed up here also.

lib/Driver/Tools.cpp

12125

Alignment

12136

This will fail linking as it won't link any CRT library.

I have no issue with leaving it out and doing it in a later patch though, got to start somewhere.

CRT support won't be very elegant as there will probably be a table of MCU name -> CRT lib, as there are several CRTs bundled with AVR GCC.

[saaadhu]

Fixed alignment issues.

[saaadhu]

lib/Driver/Tools.cpp

12136

Yes, the linked image won't run correctly, but the linker (a recent avr-ld) does run and generate a valid ELF.

And yes, the mapping from mcu to the correct lib is going to be ugly.

[jroelofs]

lib/Basic/Targets.cpp

8376

All of this ^ needs a testcase. I recommend adding to test/Preprocessor/init.c

[saaadhu]

Add testcases to test/Preprocessor/init.c
Correct types for WChar and WInt

The ABI is documented in the avr-gcc wiki (https://gcc.gnu.org/wiki/avr-gcc)
I took the output of a trunk build of avr-gcc -dM -E and put that in the Preprocessor/init.c testcase, removing everything clang does not define. The conflicting defines were

1. DBL and LDBL related defines - clang appears to consider doubles as 64 bit even if DoubleWidth is 32 bit
2. SIG_ATOMIC defines.

[jroelofs]

In D27123#614313, @saaadhu wrote:

Add testcases to test/Preprocessor/init.c

Awesome, thanks!

Correct types for WChar and WInt

The ABI is documented in the avr-gcc wiki (https://gcc.gnu.org/wiki/avr-gcc)
I took the output of a trunk build of avr-gcc -dM -E and put that in the Preprocessor/init.c testcase, removing everything clang does not define.

Good plan.

The conflicting defines were

1. DBL and LDBL related defines - clang appears to consider doubles as 64 bit even if DoubleWidth is 32 bit

I /think/ you need to set LongDoubleFormat for that to work.

2. SIG_ATOMIC defines.

What are the differences there?

[saaadhu]

Thanks, setting DoubleFormat and LongDoubleFormat fixed the DBL_ and LDBL_ differences. Also, setting SigAtomicType fixed the __SIG_ATOMIC_ differences as well. I've added those defines to the test. Unrelated, but I also removed a redundant set of LongLongAlign and overriding of GetDefaultDwarfVersion (returning 2 wasn't necessary).

The only remaining (textually) conflicting defines between "avr-gcc -dM -E" and "clang -dM -E" are

1. short vs int for a bunch of xxx_TYPE defines, like say CHAR16_TYPE. short and int are both 2 bytes for the avr, so I think either one is ok.
2. Casts vs plain literals in the defines for double MIN, MAX values. avr-gcc, for example, defines #define DBL_MAX ((double)3.40282347e+38L), whereas clang does #define DBL_MAX 3.40282347e+38. Again, I think this shouldn't matter - I've added the literals sans the cast to the test.

[jroelofs]

In D27123#615738, @saaadhu wrote:

Thanks, setting DoubleFormat and LongDoubleFormat fixed the DBL_ and LDBL_ differences. Also, setting SigAtomicType fixed the __SIG_ATOMIC_ differences as well. I've added those defines to the test. Unrelated, but I also removed a redundant set of LongLongAlign and overriding of GetDefaultDwarfVersion (returning 2 wasn't necessary).

The only remaining (textually) conflicting defines between "avr-gcc -dM -E" and "clang -dM -E" are

1. short vs int for a bunch of xxx_TYPE defines, like say CHAR16_TYPE. short and int are both 2 bytes for the avr, so I think either one is ok.

This will bite you when it comes to C++. Those two types are mangled differently, so you'll get an ABI mismatch in overloads that use those typedefs.

2. Casts vs plain literals in the defines for double MIN, MAX values. avr-gcc, for example, defines #define DBL_MAX ((double)3.40282347e+38L), whereas clang does #define DBL_MAX 3.40282347e+38. Again, I think this shouldn't matter - I've added the literals sans the cast to the test.

That should be fine.

[saaadhu]

Make defines for CHAR16_TYPE, {U,}INT_{LEAST,FAST}16_TYPE use int instead of short.

{U,}INT16_TYPE still gets defined as short though - lib/Frontend/InitPreprocessor.cpp::DefineExactWidthIntType does not use TargetInfo::getIntTypeByWidth. Instead, InitializePredefinedMacros calls the function with the specific type (SignedShort/UnsignedShort), as getShortWidth() > getCharWidth(), but getIntWidth() == getShortWidth(). Not sure what the best way to fix that is - should I make DefineExactWidthType use TargetInfo::getIntTypeByWidth?

[jroelofs]

In D27123#616887, @saaadhu wrote:

Make defines for CHAR16_TYPE, {U,}INT_{LEAST,FAST}16_TYPE use int instead of short.

{U,}INT16_TYPE still gets defined as short though - lib/Frontend/InitPreprocessor.cpp::DefineExactWidthIntType does not use TargetInfo::getIntTypeByWidth. Instead, InitializePredefinedMacros calls the function with the specific type (SignedShort/UnsignedShort), as getShortWidth() > getCharWidth(), but getIntWidth() == getShortWidth(). Not sure what the best way to fix that is - should I make DefineExactWidthType use TargetInfo::getIntTypeByWidth?

I'm not sure either. I think it's a good question for @rengolin.

[dylanmckay]

lib/Basic/Targets.cpp

8543

If we build clang without LLVM_EXPERIMENTAL_TARGETS_TO_BUILD=AVR, how will this work?

Will it fail compilation? Will clang report that AVR is supported? Will it crash if you try and run clang?

[rengolin]

In D27123#617118, @jroelofs wrote:

In D27123#616887, @saaadhu wrote:

Make defines for CHAR16_TYPE, {U,}INT_{LEAST,FAST}16_TYPE use int instead of short.

{U,}INT16_TYPE still gets defined as short though - lib/Frontend/InitPreprocessor.cpp::DefineExactWidthIntType does not use TargetInfo::getIntTypeByWidth. Instead, InitializePredefinedMacros calls the function with the specific type (SignedShort/UnsignedShort), as getShortWidth() > getCharWidth(), but getIntWidth() == getShortWidth(). Not sure what the best way to fix that is - should I make DefineExactWidthType use TargetInfo::getIntTypeByWidth?

I'm not sure either. I think it's a good question for @rengolin.

Hum, sorry, can't answer that one. :)

I find it confusing that you define CHAR16 as int and INT16 as short, with whatever INT_FAST16 is as int.

I don't know much about AVR, but the C standard predicts that short and int can have the same size, so Clang should be able to cope with it.

cheers,
--renato

lib/Basic/Targets.cpp

8543

AFAIK, Clang support for targets is independent of LLVM. A standard Clang build supports all targets up to LLVM IR (so all ABIs, PCSs, type descriptions, etc.), but it will fail if the back-end is not available and Clang is invoked beyond IR.

This is why we can only have IR tests in Clang. As long as all your tests stop at IR, this should be fine.

[jroelofs]

In D27123#617118, @jroelofs wrote:

In D27123#616887, @saaadhu wrote:

Make defines for CHAR16_TYPE, {U,}INT_{LEAST,FAST}16_TYPE use int instead of short.

{U,}INT16_TYPE still gets defined as short though - lib/Frontend/InitPreprocessor.cpp::DefineExactWidthIntType does not use TargetInfo::getIntTypeByWidth. Instead, InitializePredefinedMacros calls the function with the specific type (SignedShort/UnsignedShort), as getShortWidth() > getCharWidth(), but getIntWidth() == getShortWidth(). Not sure what the best way to fix that is - should I make DefineExactWidthType use TargetInfo::getIntTypeByWidth?

If you do, it might break other things. Might be better to leave this alone, and leave a comment with a PR for it, explaining where the differences are.

I'm not sure either. I think it's a good question for @rengolin.

[saaadhu]

Would someone with a llvm bugzilla account please file the PR for me? New user registration is disabled, and I've been waiting for [e-mail] to respond for nearly a week now.

And how should I proceed after that? Would one of the reviewers commit the patch for me?

[dylanmckay]

Signed off by Jonathan Roelofs via cfe-commits

lib/Basic/Targets.cpp

public:
 
   void getTargetDefines(const LangOptions &Opts,
                         MacroBuilder &Builder) const override {
     Builder.defineMacro("__RENDERSCRIPT__");
     AArch64leTargetInfo::getTargetDefines(Opts, Builder);
   }
 };
 
+
+// AVR Target
+class AVRTargetInfo : public TargetInfo {
+public:
+  AVRTargetInfo(const llvm::Triple &Triple, const TargetOptions &)
+      : TargetInfo(Triple) {
+    LongLongAlign = 8;
+    TLSSupported = false;
+    PointerWidth = 16;
+    PointerAlign = 8;
+    IntWidth = 16;
+    IntAlign = 8;
+    LongWidth = 32;
+    LongAlign = 8;
+    LongLongWidth = 64;
+    LongLongAlign = 8;
+    SuitableAlign = 8;
+    DefaultAlignForAttributeAligned = 8;
+    HalfWidth = 16;
+    HalfAlign = 8;
+    FloatWidth = 32;
+    FloatAlign = 8;
+    DoubleWidth = 32;
+    DoubleAlign = 8;
+    LongDoubleWidth = 32;
+    LongDoubleAlign = 8;
+    SizeType = UnsignedInt;
+    PtrDiffType = SignedInt;
+    IntPtrType = SignedInt;
+    WCharType = SignedInt;
+    WIntType = SignedInt;
+    Char32Type = UnsignedLong;
+    resetDataLayout("e-p:16:16:16-i8:8:8-i16:16:16-i32:32:32-i64:64:64"
+        "-f32:32:32-f64:64:64-n8");
+  }
+  void getTargetDefines(const LangOptions &Opts,
+                        MacroBuilder &Builder) const override {
+    Builder.defineMacro("__AVR__");
+  }
+  ArrayRef<Builtin::Info> getTargetBuiltins() const override {
+    return None;
+  }
+  BuiltinVaListKind getBuiltinVaListKind() const override {
+    return TargetInfo::VoidPtrBuiltinVaList;
+  }
+  const char *getClobbers() const override {
+    return "";
+  }
+  ArrayRef<const char *> getGCCRegNames() const override {
+    static const char * const GCCRegNames[] = {
+      "r0",   "r1",   "r2",   "r3",   "r4",   "r5",   "r6",   "r7",
+      "r8",   "r9",   "r10",  "r11",  "r12",  "r13",  "r14",  "r15",
+      "r16",  "r17",  "r18",  "r19",  "r20",  "r21",  "r22",  "r23",
+      "r24",  "r25",  "X",    "Y",    "Z",    "SP"
+    };
+    return llvm::makeArrayRef(GCCRegNames);
+  }
+  ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
+    return None;
+  }
+  ArrayRef<TargetInfo::AddlRegName> getGCCAddlRegNames() const override {
+    static const TargetInfo::AddlRegName AddlRegNames[] = {
+      { { "r26", "r27"}, 26 },
+      { { "r28", "r29"}, 27 },
+      { { "r30", "r31"}, 28 },
+      { { "SPL", "SPH"}, 29 },
+    };
+    return llvm::makeArrayRef(AddlRegNames);
+  }
+  bool validateAsmConstraint(const char *&Name,
+                             TargetInfo::ConstraintInfo &Info) const override {
+    return false;
+  }
+};
+
 } // end anonymous namespace
 
 //===----------------------------------------------------------------------===//
 // Driver code
 //===----------------------------------------------------------------------===//
 
 static TargetInfo *AllocateTarget(const llvm::Triple &Triple,
                                   const TargetOptions &Opts) {
case llvm::Triple::thumbeb:
     case llvm::Triple::RTEMS:
       return new RTEMSTargetInfo<ARMbeTargetInfo>(Triple, Opts);
     case llvm::Triple::NaCl:
       return new NaClTargetInfo<ARMbeTargetInfo>(Triple, Opts);
     default:
       return new ARMbeTargetInfo(Triple, Opts);
     }
 
+  case llvm::Triple::avr:
+    return new AVRTargetInfo(Triple, Opts);
   case llvm::Triple::bpfeb:
   case llvm::Triple::bpfel:
     return new BPFTargetInfo(Triple, Opts);
 
   case llvm::Triple::msp430:
     return new MSP430TargetInfo(Triple, Opts);
 
   case llvm::Triple::mips:

lib/Driver/Driver.cpp

default:
         break;
       case llvm::Triple::xcore:
         TC = new toolchains::XCoreToolChain(*this, Target, Args);
         break;
       case llvm::Triple::wasm32:
       case llvm::Triple::wasm64:
         TC = new toolchains::WebAssembly(*this, Target, Args);
         break;
+      case llvm::Triple::avr:
+        TC = new toolchains::AVRToolChain(*this, Target, Args);
+        break;
       default:
         if (Target.getVendor() == llvm::Triple::Myriad)
           TC = new toolchains::MyriadToolChain(*this, Target, Args);
         else if (Target.isOSBinFormatELF())
           TC = new toolchains::Generic_ELF(*this, Target, Args);
         else if (Target.isOSBinFormatMachO())
           TC = new toolchains::MachO(*this, Target, Args);
         else

lib/Driver/ToolChains.h

public:
   std::string findLibCxxIncludePath() const override { return ""; }
   void addLibStdCxxIncludePaths(
       const llvm::opt::ArgList &DriverArgs,
       llvm::opt::ArgStringList &CC1Args) const override {}
 
   SanitizerMask getSupportedSanitizers() const override;
 };
 
+class LLVM_LIBRARY_VISIBILITY AVRToolChain : public Generic_ELF {
+protected:
+  Tool *buildLinker() const override;
+public:
+  AVRToolChain(const Driver &D, const llvm::Triple &Triple,
+               const llvm::opt::ArgList &Args);
+  unsigned GetDefaultDwarfVersion() const override { return 2; }
+  bool IsIntegratedAssemblerDefault() const override { return true; }
+};
+
+
 } // end namespace toolchains
 } // end namespace driver
 } // end namespace clang
 
 #endif // LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_H

lib/Driver/ToolChains.cpp

 
 SanitizerMask Contiki::getSupportedSanitizers() const {
   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
   SanitizerMask Res = ToolChain::getSupportedSanitizers();
   if (IsX86)
     Res |= SanitizerKind::SafeStack;
   return Res;
 }
+
+/// AVR Toolchain
+AVRToolChain::AVRToolChain(const Driver &D, const llvm::Triple &Triple,
+                           const ArgList &Args)
+  : Generic_ELF(D, Triple, Args) { }
+Tool *AVRToolChain::buildLinker() const {
+  return new tools::AVR::Linker(*this);
+}
+// End AVR

lib/Driver/Tools.h

public:
    void ConstructJob(Compilation &C, const JobAction &JA,
                      const InputInfo &Output, const InputInfoList &Inputs,
                      const llvm::opt::ArgList &TCArgs,
                      const char *LinkingOutput) const override;
 };
 
 }  // end namespace NVPTX
 
+namespace AVR {
+class LLVM_LIBRARY_VISIBILITY Linker : public GnuTool {
+public:
+  Linker(const ToolChain &TC) : GnuTool("AVR::Linker", "avr-ld", TC) {}
+  bool hasIntegratedCPP() const override { return false; }
+  bool isLinkJob() const override { return true; }
+  void ConstructJob(Compilation &C, const JobAction &JA,
+                    const InputInfo &Output, const InputInfoList &Inputs,
+                    const llvm::opt::ArgList &TCArgs,
+                    const char *LinkingOutput) const override;
+};
+} // end namespace AVR
+
 } // end namespace tools
 } // end namespace driver
 } // end namespace clang
 
 #endif // LLVM_CLANG_LIB_DRIVER_TOOLS_H

lib/Driver/Tools.cpp

void NVPTX::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   }
 
   for (const auto& A : Args.getAllArgValues(options::OPT_Xcuda_fatbinary))
     CmdArgs.push_back(Args.MakeArgString(A));
 
   const char *Exec = Args.MakeArgString(TC.GetProgramPath("fatbinary"));
   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
 }
+
+void AVR::Linker::ConstructJob(Compilation &C, const JobAction &JA,
+                               const InputInfo &Output,
+                               const InputInfoList &Inputs,
+                               const ArgList &Args,
+                               const char *LinkingOutput) const {
+
+  std::string Linker = getToolChain().GetProgramPath(getShortName());
+  ArgStringList CmdArgs;
+  AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs, JA);
+  CmdArgs.push_back("-o");
+  CmdArgs.push_back(Output.getFilename());
+  C.addCommand(llvm::make_unique<Command>(JA, *this, Args.MakeArgString(Linker),
+                                          CmdArgs, Inputs));
+}
+// AVR tools end.

test/Driver/avr-toolchain.c

+// A basic clang -cc1 command-line.
+
+// RUN: %clang %s -### -target avr 2>&1 | FileCheck -check-prefix=CC1 %s
+// CC1: clang{{.*}} "-cc1" "-triple" "avr"

test/Preprocessor/init.c

 // WEBASSEMBLY64-NEXT:#define __wasm__ 1
 
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple i686-windows-cygnus < /dev/null | FileCheck -match-full-lines -check-prefix CYGWIN-X32 %s
 // CYGWIN-X32: #define __USER_LABEL_PREFIX__ _
 
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple x86_64-windows-cygnus < /dev/null | FileCheck -match-full-lines -check-prefix CYGWIN-X64 %s
 // CYGWIN-X64: #define __USER_LABEL_PREFIX__
 
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=avr \
+// RUN:   < /dev/null \
+// RUN:   | FileCheck -match-full-lines -check-prefix=AVR %s
+//
+// AVR:#define __ATOMIC_ACQUIRE 2
+// AVR:#define __ATOMIC_ACQ_REL 4
+// AVR:#define __ATOMIC_CONSUME 1
+// AVR:#define __ATOMIC_RELAXED 0
+// AVR:#define __ATOMIC_RELEASE 3
+// AVR:#define __ATOMIC_SEQ_CST 5
+// AVR:#define __AVR__ 1
+// AVR:#define __BIGGEST_ALIGNMENT__ 1
+// AVR:#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
+// AVR:#define __CHAR16_TYPE__ unsigned short
+// AVR:#define __CHAR32_TYPE__ long unsigned int
+// AVR:#define __CHAR_BIT__ 8
+// AVR:#define __FINITE_MATH_ONLY__ 0
+// AVR:#define __FLT_DECIMAL_DIG__ 9
+// AVR:#define __FLT_DENORM_MIN__ 1.40129846e-45F
+// AVR:#define __FLT_DIG__ 6
+// AVR:#define __FLT_EPSILON__ 1.19209290e-7F
+// AVR:#define __FLT_EVAL_METHOD__ 0
+// AVR:#define __FLT_HAS_DENORM__ 1
+// AVR:#define __FLT_HAS_INFINITY__ 1
+// AVR:#define __FLT_HAS_QUIET_NAN__ 1
+// AVR:#define __FLT_MANT_DIG__ 24
+// AVR:#define __FLT_MAX_10_EXP__ 38
+// AVR:#define __FLT_MAX_EXP__ 128
+// AVR:#define __FLT_MAX__ 3.40282347e+38F
+// AVR:#define __FLT_MIN_10_EXP__ (-37)
+// AVR:#define __FLT_MIN_EXP__ (-125)
+// AVR:#define __FLT_MIN__ 1.17549435e-38F
+// AVR:#define __FLT_RADIX__ 2
+// AVR:#define __GCC_ATOMIC_BOOL_LOCK_FREE 1
+// AVR:#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 1
+// AVR:#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 1
+// AVR:#define __GCC_ATOMIC_CHAR_LOCK_FREE 1
+// AVR:#define __GCC_ATOMIC_INT_LOCK_FREE 1
+// AVR:#define __GCC_ATOMIC_LLONG_LOCK_FREE 1
+// AVR:#define __GCC_ATOMIC_LONG_LOCK_FREE 1
+// AVR:#define __GCC_ATOMIC_POINTER_LOCK_FREE 1
+// AVR:#define __GCC_ATOMIC_SHORT_LOCK_FREE 1
+// AVR:#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
+// AVR:#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 1
+// AVR:#define __GXX_ABI_VERSION 1002
+// AVR:#define __INT16_MAX__ 32767
+// AVR:#define __INT16_TYPE__ short
+// AVR:#define __INT32_MAX__ 2147483647L
+// AVR:#define __INT32_TYPE__ long int
+// AVR:#define __INT64_MAX__ 9223372036854775807LL
+// AVR:#define __INT64_TYPE__ long long int
+// AVR:#define __INT8_MAX__ 127
+// AVR:#define __INT8_TYPE__ signed char
+// AVR:#define __INTMAX_MAX__ 9223372036854775807LL
+// AVR:#define __INTMAX_TYPE__ long long int
+// AVR:#define __INTPTR_MAX__ 32767
+// AVR:#define __INTPTR_TYPE__ int
+// AVR:#define __INT_FAST16_MAX__ 32767
+// AVR:#define __INT_FAST16_TYPE__ short
+// AVR:#define __INT_FAST32_MAX__ 2147483647L
+// AVR:#define __INT_FAST32_TYPE__ long int
+// AVR:#define __INT_FAST64_MAX__ 9223372036854775807LL
+// AVR:#define __INT_FAST64_TYPE__ long long int
+// AVR:#define __INT_FAST8_MAX__ 127
+// AVR:#define __INT_FAST8_TYPE__ signed char
+// AVR:#define __INT_LEAST16_MAX__ 32767
+// AVR:#define __INT_LEAST16_TYPE__ short
+// AVR:#define __INT_LEAST32_MAX__ 2147483647L
+// AVR:#define __INT_LEAST32_TYPE__ long int
+// AVR:#define __INT_LEAST64_MAX__ 9223372036854775807LL
+// AVR:#define __INT_LEAST64_TYPE__ long long int
+// AVR:#define __INT_LEAST8_MAX__ 127
+// AVR:#define __INT_LEAST8_TYPE__ signed char
+// AVR:#define __INT_MAX__ 32767
+// AVR:#define __LONG_LONG_MAX__ 9223372036854775807LL
+// AVR:#define __LONG_MAX__ 2147483647L
+// AVR:#define __NO_INLINE__ 1
+// AVR:#define __ORDER_BIG_ENDIAN__ 4321
+// AVR:#define __ORDER_LITTLE_ENDIAN__ 1234
+// AVR:#define __ORDER_PDP_ENDIAN__ 3412
+// AVR:#define __PRAGMA_REDEFINE_EXTNAME 1
+// AVR:#define __PTRDIFF_MAX__ 32767
+// AVR:#define __PTRDIFF_TYPE__ int
+// AVR:#define __SCHAR_MAX__ 127
+// AVR:#define __SHRT_MAX__ 32767
+// AVR:#define __SIZEOF_DOUBLE__ 4
+// AVR:#define __SIZEOF_FLOAT__ 4
+// AVR:#define __SIZEOF_INT__ 2
+// AVR:#define __SIZEOF_LONG_DOUBLE__ 4
+// AVR:#define __SIZEOF_LONG_LONG__ 8
+// AVR:#define __SIZEOF_LONG__ 4
+// AVR:#define __SIZEOF_POINTER__ 2
+// AVR:#define __SIZEOF_PTRDIFF_T__ 2
+// AVR:#define __SIZEOF_SHORT__ 2
+// AVR:#define __SIZEOF_SIZE_T__ 2
+// AVR:#define __SIZEOF_WCHAR_T__ 2
+// AVR:#define __SIZEOF_WINT_T__ 2
+// AVR:#define __SIZE_MAX__ 65535U
+// AVR:#define __SIZE_TYPE__ unsigned int
+// AVR:#define __STDC__ 1
+// AVR:#define __UINT16_MAX__ 65535U
+// AVR:#define __UINT16_TYPE__ unsigned short
+// AVR:#define __UINT32_MAX__ 4294967295UL
+// AVR:#define __UINT32_TYPE__ long unsigned int
+// AVR:#define __UINT64_MAX__ 18446744073709551615ULL
+// AVR:#define __UINT64_TYPE__ long long unsigned int
+// AVR:#define __UINT8_MAX__ 255
+// AVR:#define __UINT8_TYPE__ unsigned char
+// AVR:#define __UINTMAX_MAX__ 18446744073709551615ULL
+// AVR:#define __UINTMAX_TYPE__ long long unsigned int
+// AVR:#define __UINTPTR_MAX__ 65535U
+// AVR:#define __UINTPTR_TYPE__ unsigned int
+// AVR:#define __UINT_FAST16_MAX__ 65535U
+// AVR:#define __UINT_FAST16_TYPE__ unsigned short
+// AVR:#define __UINT_FAST32_MAX__ 4294967295UL
+// AVR:#define __UINT_FAST32_TYPE__ long unsigned int
+// AVR:#define __UINT_FAST64_MAX__ 18446744073709551615ULL
+// AVR:#define __UINT_FAST64_TYPE__ long long unsigned int
+// AVR:#define __UINT_FAST8_MAX__ 255
+// AVR:#define __UINT_FAST8_TYPE__ unsigned char
+// AVR:#define __UINT_LEAST16_MAX__ 65535U
+// AVR:#define __UINT_LEAST16_TYPE__ unsigned short
+// AVR:#define __UINT_LEAST32_MAX__ 4294967295UL
+// AVR:#define __UINT_LEAST32_TYPE__ long unsigned int
+// AVR:#define __UINT_LEAST64_MAX__ 18446744073709551615ULL
+// AVR:#define __UINT_LEAST64_TYPE__ long long unsigned int
+// AVR:#define __UINT_LEAST8_MAX__ 255
+// AVR:#define __UINT_LEAST8_TYPE__ unsigned char
+// AVR:#define __USER_LABEL_PREFIX__ 
+// AVR:#define __WCHAR_MAX__ 32767
+// AVR:#define __WCHAR_TYPE__ int
+// AVR:#define __WINT_TYPE__ int