X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2FCompiler.h;h=f744237e583fb5572d0f632fe5f1b24736b2059e;hb=bd1e97920ae282c0a8353173941ef5cef44c94cd;hp=d4f55e1a1b275d8ded36c2dcc586c6430eac5c8d;hpb=8bd582a3ffd37e661c5b931c9fc868a3dcbfcbae;p=oota-llvm.git diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h index d4f55e1a1b2..f744237e583 100644 --- a/include/llvm/Support/Compiler.h +++ b/include/llvm/Support/Compiler.h @@ -33,140 +33,65 @@ # define __has_builtin(x) 0 #endif -/// \macro __GNUC_PREREQ -/// \brief Defines __GNUC_PREREQ if glibc's features.h isn't available. -#ifndef __GNUC_PREREQ -# if defined(__GNUC__) && defined(__GNUC_MINOR__) -# define __GNUC_PREREQ(maj, min) \ - ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) +/// \macro LLVM_GNUC_PREREQ +/// \brief Extend the default __GNUC_PREREQ even if glibc's features.h isn't +/// available. +#ifndef LLVM_GNUC_PREREQ +# if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__) +# define LLVM_GNUC_PREREQ(maj, min, patch) \ + ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \ + ((maj) << 20) + ((min) << 10) + (patch)) +# elif defined(__GNUC__) && defined(__GNUC_MINOR__) +# define LLVM_GNUC_PREREQ(maj, min, patch) \ + ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10)) # else -# define __GNUC_PREREQ(maj, min) 0 +# define LLVM_GNUC_PREREQ(maj, min, patch) 0 # endif #endif /// \macro LLVM_MSC_PREREQ /// \brief Is the compiler MSVC of at least the specified version? /// The common \param version values to check for are: -/// * 1600: Microsoft Visual Studio 2010 / 10.0 -/// * 1700: Microsoft Visual Studio 2012 / 11.0 /// * 1800: Microsoft Visual Studio 2013 / 12.0 +/// * 1900: Microsoft Visual Studio 2015 / 14.0 #ifdef _MSC_VER #define LLVM_MSC_PREREQ(version) (_MSC_VER >= (version)) -#else -#define LLVM_MSC_PREREQ(version) 0 -#endif -/// \brief Does the compiler support r-value references? -/// This implies that provides the one-argument std::move; it -/// does not imply the existence of any other C++ library features. -#if __has_feature(cxx_rvalue_references) || \ - defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1600) -#define LLVM_HAS_RVALUE_REFERENCES 1 -#else -#define LLVM_HAS_RVALUE_REFERENCES 0 -#endif - -/// \brief Does the compiler support r-value reference *this? -/// -/// Sadly, this is separate from just r-value reference support because GCC -/// implemented everything but this thus far. No release of GCC yet has support -/// for this feature so it is enabled with Clang only. -/// FIXME: This should change to a version check when GCC grows support for it. -#if __has_feature(cxx_rvalue_references) -#define LLVM_HAS_RVALUE_REFERENCE_THIS 1 -#else -#define LLVM_HAS_RVALUE_REFERENCE_THIS 0 +// We require at least MSVC 2013. +#if !LLVM_MSC_PREREQ(1800) +#error LLVM requires at least MSVC 2013. #endif -/// \macro LLVM_HAS_CXX11_TYPETRAITS -/// \brief Does the compiler have the C++11 type traits. -/// -/// #include -/// -/// * enable_if -/// * {true,false}_type -/// * is_constructible -/// * etc... -#if defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1700) -#define LLVM_HAS_CXX11_TYPETRAITS 1 #else -#define LLVM_HAS_CXX11_TYPETRAITS 0 +#define LLVM_MSC_PREREQ(version) 0 #endif -/// \macro LLVM_HAS_CXX11_STDLIB -/// \brief Does the compiler have the C++11 standard library. -/// -/// Implies LLVM_HAS_RVALUE_REFERENCES, LLVM_HAS_CXX11_TYPETRAITS -#if defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1700) -#define LLVM_HAS_CXX11_STDLIB 1 +#if !defined(_MSC_VER) || defined(__clang__) || LLVM_MSC_PREREQ(1900) +#define LLVM_NOEXCEPT noexcept #else -#define LLVM_HAS_CXX11_STDLIB 0 +#define LLVM_NOEXCEPT throw() #endif -/// \macro LLVM_HAS_VARIADIC_TEMPLATES -/// \brief Does this compiler support variadic templates. +/// \brief Does the compiler support ref-qualifiers for *this? /// -/// Implies LLVM_HAS_RVALUE_REFERENCES and the existence of std::forward. -#if __has_feature(cxx_variadic_templates) || LLVM_MSC_PREREQ(1800) -# define LLVM_HAS_VARIADIC_TEMPLATES 1 -#else -# define LLVM_HAS_VARIADIC_TEMPLATES 0 -#endif - -/// llvm_move - Expands to ::std::move if the compiler supports -/// r-value references; otherwise, expands to the argument. -#if LLVM_HAS_RVALUE_REFERENCES -#define llvm_move(value) (::std::move(value)) +/// Sadly, this is separate from just rvalue reference support because GCC +/// and MSVC implemented this later than everything else. +#if __has_feature(cxx_rvalue_references) || LLVM_GNUC_PREREQ(4, 8, 1) +#define LLVM_HAS_RVALUE_REFERENCE_THIS 1 #else -#define llvm_move(value) (value) +#define LLVM_HAS_RVALUE_REFERENCE_THIS 0 #endif -/// Expands to '&' if r-value references are supported. +/// Expands to '&' if ref-qualifiers for *this are supported. /// -/// This can be used to provide l-value/r-value overrides of member functions. -/// The r-value override should be guarded by LLVM_HAS_RVALUE_REFERENCE_THIS +/// This can be used to provide lvalue/rvalue overrides of member functions. +/// The rvalue override should be guarded by LLVM_HAS_RVALUE_REFERENCE_THIS #if LLVM_HAS_RVALUE_REFERENCE_THIS #define LLVM_LVALUE_FUNCTION & #else #define LLVM_LVALUE_FUNCTION #endif -/// LLVM_DELETED_FUNCTION - Expands to = delete if the compiler supports it. -/// Use to mark functions as uncallable. Member functions with this should -/// be declared private so that some behavior is kept in C++03 mode. -/// -/// class DontCopy { -/// private: -/// DontCopy(const DontCopy&) LLVM_DELETED_FUNCTION; -/// DontCopy &operator =(const DontCopy&) LLVM_DELETED_FUNCTION; -/// public: -/// ... -/// }; -#if __has_feature(cxx_deleted_functions) || \ - defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1800) -#define LLVM_DELETED_FUNCTION = delete -#else -#define LLVM_DELETED_FUNCTION -#endif - -/// LLVM_FINAL - Expands to 'final' if the compiler supports it. -/// Use to mark classes or virtual methods as final. -#if __has_feature(cxx_override_control) || \ - defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1700) -#define LLVM_FINAL final -#else -#define LLVM_FINAL -#endif - -/// LLVM_OVERRIDE - Expands to 'override' if the compiler supports it. -/// Use to mark virtual methods as overriding a base class method. -#if __has_feature(cxx_override_control) || \ - defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1700) -#define LLVM_OVERRIDE override -#else -#define LLVM_OVERRIDE -#endif - #if __has_feature(cxx_constexpr) || defined(__GXX_EXPERIMENTAL_CXX0X__) # define LLVM_CONSTEXPR constexpr #else @@ -178,20 +103,26 @@ /// not accessible from outside it. Can also be used to mark variables and /// functions, making them private to any shared library they are linked into. /// On PE/COFF targets, library visibility is the default, so this isn't needed. -#if (__has_attribute(visibility) || __GNUC_PREREQ(4, 0)) && \ +#if (__has_attribute(visibility) || LLVM_GNUC_PREREQ(4, 0, 0)) && \ !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(LLVM_ON_WIN32) #define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden"))) #else #define LLVM_LIBRARY_VISIBILITY #endif -#if __has_attribute(used) || __GNUC_PREREQ(3, 1) +#if __has_attribute(sentinel) || LLVM_GNUC_PREREQ(3, 0, 0) +#define LLVM_END_WITH_NULL __attribute__((sentinel)) +#else +#define LLVM_END_WITH_NULL +#endif + +#if __has_attribute(used) || LLVM_GNUC_PREREQ(3, 1, 0) #define LLVM_ATTRIBUTE_USED __attribute__((__used__)) #else #define LLVM_ATTRIBUTE_USED #endif -#if __has_attribute(warn_unused_result) || __GNUC_PREREQ(3, 4) +#if __has_attribute(warn_unused_result) || LLVM_GNUC_PREREQ(3, 4, 0) #define LLVM_ATTRIBUTE_UNUSED_RESULT __attribute__((__warn_unused_result__)) #else #define LLVM_ATTRIBUTE_UNUSED_RESULT @@ -205,14 +136,14 @@ // more portable solution: // (void)unused_var_name; // Prefer cast-to-void wherever it is sufficient. -#if __has_attribute(unused) || __GNUC_PREREQ(3, 1) +#if __has_attribute(unused) || LLVM_GNUC_PREREQ(3, 1, 0) #define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__)) #else #define LLVM_ATTRIBUTE_UNUSED #endif // FIXME: Provide this for PE/COFF targets. -#if (__has_attribute(weak) || __GNUC_PREREQ(4, 0)) && \ +#if (__has_attribute(weak) || LLVM_GNUC_PREREQ(4, 0, 0)) && \ (!defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(LLVM_ON_WIN32)) #define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__)) #else @@ -235,7 +166,7 @@ #define LLVM_READONLY #endif -#if __has_builtin(__builtin_expect) || __GNUC_PREREQ(4, 0) +#if __has_builtin(__builtin_expect) || LLVM_GNUC_PREREQ(4, 0, 0) #define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true) #define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false) #else @@ -243,22 +174,9 @@ #define LLVM_UNLIKELY(EXPR) (EXPR) #endif -// C++ doesn't support 'extern template' of template specializations. GCC does, -// but requires __extension__ before it. In the header, use this: -// EXTERN_TEMPLATE_INSTANTIATION(class foo); -// in the .cpp file, use this: -// TEMPLATE_INSTANTIATION(class foo); -#ifdef __GNUC__ -#define EXTERN_TEMPLATE_INSTANTIATION(X) __extension__ extern template X -#define TEMPLATE_INSTANTIATION(X) template X -#else -#define EXTERN_TEMPLATE_INSTANTIATION(X) -#define TEMPLATE_INSTANTIATION(X) -#endif - /// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so, /// mark a method "not for inlining". -#if __has_attribute(noinline) || __GNUC_PREREQ(3, 4) +#if __has_attribute(noinline) || LLVM_GNUC_PREREQ(3, 4, 0) #define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline)) #elif defined(_MSC_VER) #define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline) @@ -270,8 +188,8 @@ /// so, mark a method "always inline" because it is performance sensitive. GCC /// 3.4 supported this but is buggy in various cases and produces unimplemented /// errors, just use it in GCC 4.0 and later. -#if __has_attribute(always_inline) || __GNUC_PREREQ(4, 0) -#define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline)) +#if __has_attribute(always_inline) || LLVM_GNUC_PREREQ(4, 0, 0) +#define LLVM_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline)) #elif defined(_MSC_VER) #define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline #else @@ -286,6 +204,22 @@ #define LLVM_ATTRIBUTE_NORETURN #endif +#if __has_attribute(returns_nonnull) || LLVM_GNUC_PREREQ(4, 9, 0) +#define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull)) +#else +#define LLVM_ATTRIBUTE_RETURNS_NONNULL +#endif + +/// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a +/// pointer that does not alias any other valid pointer. +#ifdef __GNUC__ +#define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__)) +#elif defined(_MSC_VER) +#define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict) +#else +#define LLVM_ATTRIBUTE_RETURNS_NOALIAS +#endif + /// LLVM_EXTENSION - Support compilers where we have a keyword to suppress /// pedantic diagnostics. #ifdef __GNUC__ @@ -312,7 +246,7 @@ /// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands /// to an expression which states that it is undefined behavior for the /// compiler to reach this point. Otherwise is not defined. -#if __has_builtin(__builtin_unreachable) || __GNUC_PREREQ(4, 5) +#if __has_builtin(__builtin_unreachable) || LLVM_GNUC_PREREQ(4, 5, 0) # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable() #elif defined(_MSC_VER) # define LLVM_BUILTIN_UNREACHABLE __assume(false) @@ -320,15 +254,21 @@ /// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression /// which causes the program to exit abnormally. -#if __has_builtin(__builtin_trap) || __GNUC_PREREQ(4, 3) +#if __has_builtin(__builtin_trap) || LLVM_GNUC_PREREQ(4, 3, 0) # define LLVM_BUILTIN_TRAP __builtin_trap() +#elif defined(_MSC_VER) +// The __debugbreak intrinsic is supported by MSVC, does not require forward +// declarations involving platform-specific typedefs (unlike RaiseException), +// results in a call to vectored exception handlers, and encodes to a short +// instruction that still causes the trapping behavior we want. +# define LLVM_BUILTIN_TRAP __debugbreak() #else # define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0 #endif /// \macro LLVM_ASSUME_ALIGNED /// \brief Returns a pointer with an assumed alignment. -#if __has_builtin(__builtin_assume_aligned) && __GNUC_PREREQ(4, 7) +#if __has_builtin(__builtin_assume_aligned) || LLVM_GNUC_PREREQ(4, 7, 0) # define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a) #elif defined(LLVM_BUILTIN_UNREACHABLE) // As of today, clang does not support __builtin_assume_aligned. @@ -338,6 +278,37 @@ # define LLVM_ASSUME_ALIGNED(p, a) (p) #endif +/// \macro LLVM_ALIGNAS +/// \brief Used to specify a minimum alignment for a structure or variable. The +/// alignment must be a constant integer. Use LLVM_PTR_SIZE to compute +/// alignments in terms of the size of a pointer. +/// +/// Note that __declspec(align) has special quirks, it's not legal to pass a +/// structure with __declspec(align) as a formal parameter. +#ifdef _MSC_VER +# define LLVM_ALIGNAS(x) __declspec(align(x)) +#elif __GNUC__ && !__has_feature(cxx_alignas) && !LLVM_GNUC_PREREQ(4, 8, 0) +# define LLVM_ALIGNAS(x) __attribute__((aligned(x))) +#else +# define LLVM_ALIGNAS(x) alignas(x) +#endif + +/// \macro LLVM_PTR_SIZE +/// \brief A constant integer equivalent to the value of sizeof(void*). +/// Generally used in combination with LLVM_ALIGNAS or when doing computation in +/// the preprocessor. +#ifdef __SIZEOF_POINTER__ +# define LLVM_PTR_SIZE __SIZEOF_POINTER__ +#elif defined(_WIN64) +# define LLVM_PTR_SIZE 8 +#elif defined(_WIN32) +# define LLVM_PTR_SIZE 4 +#elif defined(_MSC_VER) +# error "could not determine LLVM_PTR_SIZE as a constant int for MSVC" +#else +# define LLVM_PTR_SIZE sizeof(void *) +#endif + /// \macro LLVM_FUNCTION_NAME /// \brief Expands to __func__ on compilers which support it. Otherwise, /// expands to a compiler-dependent replacement. @@ -347,19 +318,15 @@ # define LLVM_FUNCTION_NAME __func__ #endif -#if defined(HAVE_SANITIZER_MSAN_INTERFACE_H) -# include -#else -# define __msan_allocated_memory(p, size) -# define __msan_unpoison(p, size) -#endif - /// \macro LLVM_MEMORY_SANITIZER_BUILD /// \brief Whether LLVM itself is built with MemorySanitizer instrumentation. #if __has_feature(memory_sanitizer) # define LLVM_MEMORY_SANITIZER_BUILD 1 +# include #else # define LLVM_MEMORY_SANITIZER_BUILD 0 +# define __msan_allocated_memory(p, size) +# define __msan_unpoison(p, size) #endif /// \macro LLVM_ADDRESS_SANITIZER_BUILD @@ -370,68 +337,81 @@ # define LLVM_ADDRESS_SANITIZER_BUILD 0 #endif -/// \macro LLVM_IS_UNALIGNED_ACCESS_FAST -/// \brief Is unaligned memory access fast on the host machine. -/// -/// Don't specialize on alignment for platforms where unaligned memory accesses -/// generates the same code as aligned memory accesses for common types. -#if defined(_M_AMD64) || defined(_M_IX86) || defined(__amd64) || \ - defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) || \ - defined(_X86_) || defined(__i386) || defined(__i386__) -# define LLVM_IS_UNALIGNED_ACCESS_FAST 1 +/// \macro LLVM_THREAD_SANITIZER_BUILD +/// \brief Whether LLVM itself is built with ThreadSanitizer instrumentation. +#if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__) +# define LLVM_THREAD_SANITIZER_BUILD 1 #else -# define LLVM_IS_UNALIGNED_ACCESS_FAST 0 +# define LLVM_THREAD_SANITIZER_BUILD 0 #endif -/// \macro LLVM_EXPLICIT -/// \brief Expands to explicit on compilers which support explicit conversion -/// operators. Otherwise expands to nothing. -#if __has_feature(cxx_explicit_conversions) || \ - defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1800) -#define LLVM_EXPLICIT explicit -#else -#define LLVM_EXPLICIT -#endif +#if LLVM_THREAD_SANITIZER_BUILD +// Thread Sanitizer is a tool that finds races in code. +// See http://code.google.com/p/data-race-test/wiki/DynamicAnnotations . +// tsan detects these exact functions by name. +extern "C" { +void AnnotateHappensAfter(const char *file, int line, const volatile void *cv); +void AnnotateHappensBefore(const char *file, int line, const volatile void *cv); +void AnnotateIgnoreWritesBegin(const char *file, int line); +void AnnotateIgnoreWritesEnd(const char *file, int line); +} -/// \macro LLVM_STATIC_ASSERT -/// \brief Expands to C/C++'s static_assert on compilers which support it. -#if __has_feature(cxx_static_assert) || \ - defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1600) -# define LLVM_STATIC_ASSERT(expr, msg) static_assert(expr, msg) -#elif __has_feature(c_static_assert) -# define LLVM_STATIC_ASSERT(expr, msg) _Static_assert(expr, msg) -#elif __has_extension(c_static_assert) -# define LLVM_STATIC_ASSERT(expr, msg) LLVM_EXTENSION _Static_assert(expr, msg) -#else -# define LLVM_STATIC_ASSERT(expr, msg) -#endif +// This marker is used to define a happens-before arc. The race detector will +// infer an arc from the begin to the end when they share the same pointer +// argument. +# define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv) + +// This marker defines the destination of a happens-before arc. +# define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv) -/// \macro LLVM_ENUM_INT_TYPE -/// \brief Expands to colon followed by the given integral type on compilers -/// which support C++11 strong enums. This can be used to make enums unsigned -/// with MSVC. -#if __has_feature(cxx_strong_enums) || LLVM_MSC_PREREQ(1600) -# define LLVM_ENUM_INT_TYPE(intty) : intty +// Ignore any races on writes between here and the next TsanIgnoreWritesEnd. +# define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__) + +// Resume checking for racy writes. +# define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__) #else -# define LLVM_ENUM_INT_TYPE(intty) +# define TsanHappensBefore(cv) +# define TsanHappensAfter(cv) +# define TsanIgnoreWritesBegin() +# define TsanIgnoreWritesEnd() #endif -/// \brief Does the compiler support C++11 semantics for strongly typed forward -/// declared enums? -#if __has_feature(cxx_strong_enums) || LLVM_MSC_PREREQ(1700) -#define LLVM_HAS_STRONG_ENUMS 1 +/// \brief Mark debug helper function definitions like dump() that should not be +/// stripped from debug builds. +// FIXME: Move this to a private config.h as it's not usable in public headers. +#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) +#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED #else -#define LLVM_HAS_STRONG_ENUMS 0 +#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE #endif -/// \brief Does the compiler support generalized initializers (using braced -/// lists and std::initializer_list). While clang may claim it supports general -/// initializers, if we're using MSVC's headers, we might not have a usable -/// std::initializer list type from the STL. Disable this for now. -#if __has_feature(cxx_generalized_initializers) && !defined(_MSC_VER) -#define LLVM_HAS_INITIALIZER_LISTS 1 +/// \macro LLVM_THREAD_LOCAL +/// \brief A thread-local storage specifier which can be used with globals, +/// extern globals, and static globals. +/// +/// This is essentially an extremely restricted analog to C++11's thread_local +/// support, and uses that when available. However, it falls back on +/// platform-specific or vendor-provided extensions when necessary. These +/// extensions don't support many of the C++11 thread_local's features. You +/// should only use this for PODs that you can statically initialize to +/// some constant value. In almost all circumstances this is most appropriate +/// for use with a pointer, integer, or small aggregation of pointers and +/// integers. +#if LLVM_ENABLE_THREADS +#if __has_feature(cxx_thread_local) +#define LLVM_THREAD_LOCAL thread_local +#elif defined(_MSC_VER) +// MSVC supports this with a __declspec. +#define LLVM_THREAD_LOCAL __declspec(thread) #else -#define LLVM_HAS_INITIALIZER_LISTS 0 +// Clang, GCC, and other compatible compilers used __thread prior to C++11 and +// we only need the restricted functionality that provides. +#define LLVM_THREAD_LOCAL __thread +#endif +#else // !LLVM_ENABLE_THREADS +// If threading is disabled entirely, this compiles to nothing and you get +// a normal global variable. +#define LLVM_THREAD_LOCAL #endif #endif