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Diffstat (limited to 'absl/base/attributes.h')
| -rw-r--r-- | absl/base/attributes.h | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/absl/base/attributes.h b/absl/base/attributes.h new file mode 100644 index 000000000000..5eecdabedb16 --- /dev/null +++ b/absl/base/attributes.h @@ -0,0 +1,469 @@ +// Copyright 2017 The Abseil Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +// Various macros for C++ attributes +// This file is used for both C and C++! +// +// Most macros here are exposing GCC or Clang features, and are stubbed out for +// other compilers. +// GCC attributes documentation: +// https://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/Function-Attributes.html +// https://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/Variable-Attributes.html +// https://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/Type-Attributes.html +// +// Most attributes in this file are already supported by GCC 4.7. +// However, some of them are not supported in older version of Clang. +// Thus, we check __has_attribute() first. If the check fails, we check if we +// are on GCC and assume the attribute exists on GCC (which is verified on GCC +// 4.7). +// +// For sanitizer-related attributes, define the following macros +// using -D along with the given value for -fsanitize: +// - ADDRESS_SANITIZER with -fsanitize=address (GCC 4.8+, Clang) +// - MEMORY_SANITIZER with -fsanitize=memory (Clang) +// - THREAD_SANITIZER with -fsanitize=thread (GCC 4.8+, Clang) +// - UNDEFINED_BEHAVIOR_SANITIZER with -fsanitize=undefined (GCC 4.9+, Clang) +// - CONTROL_FLOW_INTEGRITY with -fsanitize=cfi (Clang) +// Since these are only supported by GCC and Clang now, we only check for +// __GNUC__ (GCC or Clang) and the above macros. +#ifndef ABSL_BASE_ATTRIBUTES_H_ +#define ABSL_BASE_ATTRIBUTES_H_ + +// ABSL_HAVE_ATTRIBUTE is a function-like feature checking macro. +// It's a wrapper around __has_attribute, which is defined by GCC 5+ and Clang. +// It evaluates to a nonzero constant integer if the attribute is supported +// or 0 if not. +// It evaluates to zero if __has_attribute is not defined by the compiler. +// GCC: https://gcc.gnu.org/gcc-5/changes.html +// Clang: https://clang.llvm.org/docs/LanguageExtensions.html +#ifdef __has_attribute +#define ABSL_HAVE_ATTRIBUTE(x) __has_attribute(x) +#else +#define ABSL_HAVE_ATTRIBUTE(x) 0 +#endif + +// ABSL_HAVE_CPP_ATTRIBUTE is a function-like feature checking macro that +// accepts C++11 style attributes. It's a wrapper around __has_cpp_attribute, +// defined by ISO C++ SD-6 +// (http://en.cppreference.com/w/cpp/experimental/feature_test). If we don't +// find __has_cpp_attribute, will evaluate to 0. +#if defined(__cplusplus) && defined(__has_cpp_attribute) +// NOTE: requiring __cplusplus above should not be necessary, but +// works around https://bugs.llvm.org/show_bug.cgi?id=23435. +#define ABSL_HAVE_CPP_ATTRIBUTE(x) __has_cpp_attribute(x) +#else +#define ABSL_HAVE_CPP_ATTRIBUTE(x) 0 +#endif + +// ----------------------------------------------------------------------------- +// Function Attributes +// ----------------------------------------------------------------------------- +// GCC: https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html +// Clang: https://clang.llvm.org/docs/AttributeReference.html + +// ABSL_PRINTF_ATTRIBUTE, ABSL_SCANF_ATTRIBUTE +// Tell the compiler to do printf format std::string checking if the +// compiler supports it; see the 'format' attribute in +// <http://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/Function-Attributes.html>. +// +// N.B.: As the GCC manual states, "[s]ince non-static C++ methods +// have an implicit 'this' argument, the arguments of such methods +// should be counted from two, not one." +#if ABSL_HAVE_ATTRIBUTE(format) || (defined(__GNUC__) && !defined(__clang__)) +#define ABSL_PRINTF_ATTRIBUTE(string_index, first_to_check) \ + __attribute__((__format__(__printf__, string_index, first_to_check))) +#define ABSL_SCANF_ATTRIBUTE(string_index, first_to_check) \ + __attribute__((__format__(__scanf__, string_index, first_to_check))) +#else +#define ABSL_PRINTF_ATTRIBUTE(string_index, first_to_check) +#define ABSL_SCANF_ATTRIBUTE(string_index, first_to_check) +#endif + +// ABSL_ATTRIBUTE_ALWAYS_INLINE, ABSL_ATTRIBUTE_NOINLINE +// For functions we want to force inline or not inline. +// Introduced in gcc 3.1. +#if ABSL_HAVE_ATTRIBUTE(always_inline) || \ + (defined(__GNUC__) && !defined(__clang__)) +#define ABSL_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline)) +#define ABSL_HAVE_ATTRIBUTE_ALWAYS_INLINE 1 +#else +#define ABSL_ATTRIBUTE_ALWAYS_INLINE +#endif + +#if ABSL_HAVE_ATTRIBUTE(noinline) || (defined(__GNUC__) && !defined(__clang__)) +#define ABSL_ATTRIBUTE_NOINLINE __attribute__((noinline)) +#define ABSL_HAVE_ATTRIBUTE_NOINLINE 1 +#else +#define ABSL_ATTRIBUTE_NOINLINE +#endif + +// ABSL_ATTRIBUTE_NO_TAIL_CALL +// Prevent the compiler from optimizing away stack frames for functions which +// end in a call to another function. +#if ABSL_HAVE_ATTRIBUTE(disable_tail_calls) +#define ABSL_HAVE_ATTRIBUTE_NO_TAIL_CALL 1 +#define ABSL_ATTRIBUTE_NO_TAIL_CALL __attribute__((disable_tail_calls)) +#elif defined(__GNUC__) && !defined(__clang__) +#define ABSL_HAVE_ATTRIBUTE_NO_TAIL_CALL 1 +#define ABSL_ATTRIBUTE_NO_TAIL_CALL \ + __attribute__((optimize("no-optimize-sibling-calls"))) +#else +#define ABSL_ATTRIBUTE_NO_TAIL_CALL +#define ABSL_HAVE_ATTRIBUTE_NO_TAIL_CALL 0 +#endif +// ABSL_ATTRIBUTE_WEAK +// For weak functions +#if ABSL_HAVE_ATTRIBUTE(weak) || (defined(__GNUC__) && !defined(__clang__)) +#undef ABSL_ATTRIBUTE_WEAK +#define ABSL_ATTRIBUTE_WEAK __attribute__((weak)) +#define ABSL_HAVE_ATTRIBUTE_WEAK 1 +#else +#define ABSL_ATTRIBUTE_WEAK +#define ABSL_HAVE_ATTRIBUTE_WEAK 0 +#endif +// ABSL_ATTRIBUTE_NONNULL +// Tell the compiler either that a particular function parameter +// should be a non-null pointer, or that all pointer arguments should +// be non-null. +// +// Note: As the GCC manual states, "[s]ince non-static C++ methods +// have an implicit 'this' argument, the arguments of such methods +// should be counted from two, not one." +// +// Args are indexed starting at 1. +// For non-static class member functions, the implicit "this" argument +// is arg 1, and the first explicit argument is arg 2. +// For static class member functions, there is no implicit "this", and +// the first explicit argument is arg 1. +// +// /* arg_a cannot be null, but arg_b can */ +// void Function(void* arg_a, void* arg_b) ABSL_ATTRIBUTE_NONNULL(1); +// +// class C { +// /* arg_a cannot be null, but arg_b can */ +// void Method(void* arg_a, void* arg_b) ABSL_ATTRIBUTE_NONNULL(2); +// +// /* arg_a cannot be null, but arg_b can */ +// static void StaticMethod(void* arg_a, void* arg_b) +// ABSL_ATTRIBUTE_NONNULL(1); +// }; +// +// If no arguments are provided, then all pointer arguments should be non-null. +// +// /* No pointer arguments may be null. */ +// void Function(void* arg_a, void* arg_b, int arg_c) ABSL_ATTRIBUTE_NONNULL(); +// +// NOTE: The GCC nonnull attribute actually accepts a list of arguments, but +// ABSL_ATTRIBUTE_NONNULL does not. +#if ABSL_HAVE_ATTRIBUTE(nonnull) || (defined(__GNUC__) && !defined(__clang__)) +#define ABSL_ATTRIBUTE_NONNULL(arg_index) __attribute__((nonnull(arg_index))) +#else +#define ABSL_ATTRIBUTE_NONNULL(...) +#endif +// ABSL_ATTRIBUTE_NORETURN +// Tell the compiler that a given function never returns +#if ABSL_HAVE_ATTRIBUTE(noreturn) || (defined(__GNUC__) && !defined(__clang__)) +#define ABSL_ATTRIBUTE_NORETURN __attribute__((noreturn)) +#elif defined(_MSC_VER) +#define ABSL_ATTRIBUTE_NORETURN __declspec(noreturn) +#else +#define ABSL_ATTRIBUTE_NORETURN +#endif +// ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS +// Tell AddressSanitizer (or other memory testing tools) to ignore a given +// function. Useful for cases when a function reads random locations on stack, +// calls _exit from a cloned subprocess, deliberately accesses buffer +// out of bounds or does other scary things with memory. +// NOTE: GCC supports AddressSanitizer(asan) since 4.8. +// https://gcc.gnu.org/gcc-4.8/changes.html +#if defined(__GNUC__) && defined(ADDRESS_SANITIZER) +#define ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address)) +#else +#define ABSL_ATTRIBUTE_NO_SANITIZE_ADDRESS +#endif + +// ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY +// Tell MemorySanitizer to relax the handling of a given function. All "Use of +// uninitialized value" warnings from such functions will be suppressed, and all +// values loaded from memory will be considered fully initialized. +// This is similar to the ADDRESS_SANITIZER attribute above, but deals with +// initializedness rather than addressability issues. +// NOTE: MemorySanitizer(msan) is supported by Clang but not GCC. +#if defined(__GNUC__) && defined(MEMORY_SANITIZER) +#define ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY __attribute__((no_sanitize_memory)) +#else +#define ABSL_ATTRIBUTE_NO_SANITIZE_MEMORY +#endif + +// ABSL_ATTRIBUTE_NO_SANITIZE_THREAD +// Tell ThreadSanitizer to not instrument a given function. +// If you are adding this attribute, please cc dynamic-tools@ on the cl. +// NOTE: GCC supports ThreadSanitizer(tsan) since 4.8. +// https://gcc.gnu.org/gcc-4.8/changes.html +#if defined(__GNUC__) && defined(THREAD_SANITIZER) +#define ABSL_ATTRIBUTE_NO_SANITIZE_THREAD __attribute__((no_sanitize_thread)) +#else +#define ABSL_ATTRIBUTE_NO_SANITIZE_THREAD +#endif + +// ABSL_ATTRIBUTE_NO_SANITIZE_UNDEFINED +// Tell UndefinedSanitizer to ignore a given function. Useful for cases +// where certain behavior (eg. devision by zero) is being used intentionally. +// NOTE: GCC supports UndefinedBehaviorSanitizer(ubsan) since 4.9. +// https://gcc.gnu.org/gcc-4.9/changes.html +#if defined(__GNUC__) && \ + (defined(UNDEFINED_BEHAVIOR_SANITIZER) || defined(ADDRESS_SANITIZER)) +#define ABSL_ATTRIBUTE_NO_SANITIZE_UNDEFINED \ + __attribute__((no_sanitize("undefined"))) +#else +#define ABSL_ATTRIBUTE_NO_SANITIZE_UNDEFINED +#endif + +// ABSL_ATTRIBUTE_NO_SANITIZE_CFI +// Tell ControlFlowIntegrity sanitizer to not instrument a given function. +// See https://clang.llvm.org/docs/ControlFlowIntegrity.html for details. +#if defined(__GNUC__) && defined(CONTROL_FLOW_INTEGRITY) +#define ABSL_ATTRIBUTE_NO_SANITIZE_CFI __attribute__((no_sanitize("cfi"))) +#else +#define ABSL_ATTRIBUTE_NO_SANITIZE_CFI +#endif + +// ABSL_ATTRIBUTE_SECTION +// Labeled sections are not supported on Darwin/iOS. +#ifdef ABSL_HAVE_ATTRIBUTE_SECTION +#error ABSL_HAVE_ATTRIBUTE_SECTION cannot be directly set +#elif (ABSL_HAVE_ATTRIBUTE(section) || \ + (defined(__GNUC__) && !defined(__clang__))) && \ + !defined(__APPLE__) +#define ABSL_HAVE_ATTRIBUTE_SECTION 1 +// +// Tell the compiler/linker to put a given function into a section and define +// "__start_ ## name" and "__stop_ ## name" symbols to bracket the section. +// This functionality is supported by GNU linker. +// Any function with ABSL_ATTRIBUTE_SECTION must not be inlined, or it will +// be placed into whatever section its caller is placed into. +// +#ifndef ABSL_ATTRIBUTE_SECTION +#define ABSL_ATTRIBUTE_SECTION(name) \ + __attribute__((section(#name))) __attribute__((noinline)) +#endif +// Tell the compiler/linker to put a given variable into a section and define +// "__start_ ## name" and "__stop_ ## name" symbols to bracket the section. +// This functionality is supported by GNU linker. +#ifndef ABSL_ATTRIBUTE_SECTION_VARIABLE +#define ABSL_ATTRIBUTE_SECTION_VARIABLE(name) __attribute__((section(#name))) +#endif +// +// Weak section declaration to be used as a global declaration +// for ABSL_ATTRIBUTE_SECTION_START|STOP(name) to compile and link +// even without functions with ABSL_ATTRIBUTE_SECTION(name). +// ABSL_DEFINE_ATTRIBUTE_SECTION should be in the exactly one file; it's +// a no-op on ELF but not on Mach-O. +// +#ifndef ABSL_DECLARE_ATTRIBUTE_SECTION_VARS +#define ABSL_DECLARE_ATTRIBUTE_SECTION_VARS(name) \ + extern char __start_##name[] ABSL_ATTRIBUTE_WEAK; \ + extern char __stop_##name[] ABSL_ATTRIBUTE_WEAK +#endif +#ifndef ABSL_DEFINE_ATTRIBUTE_SECTION_VARS +#define ABSL_INIT_ATTRIBUTE_SECTION_VARS(name) +#define ABSL_DEFINE_ATTRIBUTE_SECTION_VARS(name) +#endif + +// Return void* pointers to start/end of a section of code with +// functions having ABSL_ATTRIBUTE_SECTION(name). +// Returns 0 if no such functions exist. +// One must ABSL_DECLARE_ATTRIBUTE_SECTION_VARS(name) for this to compile and +// link. +// +#define ABSL_ATTRIBUTE_SECTION_START(name) \ + (reinterpret_cast<void *>(__start_##name)) +#define ABSL_ATTRIBUTE_SECTION_STOP(name) \ + (reinterpret_cast<void *>(__stop_##name)) +#else // !ABSL_HAVE_ATTRIBUTE_SECTION + +#define ABSL_HAVE_ATTRIBUTE_SECTION 0 + +// provide dummy definitions +#define ABSL_ATTRIBUTE_SECTION(name) +#define ABSL_ATTRIBUTE_SECTION_VARIABLE(name) +#define ABSL_INIT_ATTRIBUTE_SECTION_VARS(name) +#define ABSL_DEFINE_ATTRIBUTE_SECTION_VARS(name) +#define ABSL_DECLARE_ATTRIBUTE_SECTION_VARS(name) +#define ABSL_ATTRIBUTE_SECTION_START(name) (reinterpret_cast<void *>(0)) +#define ABSL_ATTRIBUTE_SECTION_STOP(name) (reinterpret_cast<void *>(0)) +#endif // ABSL_ATTRIBUTE_SECTION + +// ABSL_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC +// Support for aligning the stack on 32-bit x86. +#if ABSL_HAVE_ATTRIBUTE(force_align_arg_pointer) || \ + (defined(__GNUC__) && !defined(__clang__)) +#if defined(__i386__) +#define ABSL_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC \ + __attribute__((force_align_arg_pointer)) +#define ABSL_REQUIRE_STACK_ALIGN_TRAMPOLINE (0) +#elif defined(__x86_64__) +#define ABSL_REQUIRE_STACK_ALIGN_TRAMPOLINE (1) +#define ABSL_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC +#else // !__i386__ && !__x86_64 +#define ABSL_REQUIRE_STACK_ALIGN_TRAMPOLINE (0) +#define ABSL_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC +#endif // __i386__ +#else +#define ABSL_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC +#define ABSL_REQUIRE_STACK_ALIGN_TRAMPOLINE (0) +#endif + +// ABSL_MUST_USE_RESULT +// Tell the compiler to warn about unused return values for functions declared +// with this macro. The macro must appear as the very first part of a function +// declaration or definition: +// +// ABSL_MUST_USE_RESULT Sprocket* AllocateSprocket(); +// +// This placement has the broadest compatibility with GCC, Clang, and MSVC, with +// both defs and decls, and with GCC-style attributes, MSVC declspec, C++11 +// and C++17 attributes. +// +// ABSL_MUST_USE_RESULT allows using cast-to-void to suppress the unused result +// warning. For that, warn_unused_result is used only for clang but not for gcc. +// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66425 +// +// Note: past advice was to place the macro after the argument list. +#if ABSL_HAVE_ATTRIBUTE(nodiscard) +#define ABSL_MUST_USE_RESULT [[nodiscard]] +#elif defined(__clang__) && ABSL_HAVE_ATTRIBUTE(warn_unused_result) +#define ABSL_MUST_USE_RESULT __attribute__((warn_unused_result)) +#else +#define ABSL_MUST_USE_RESULT +#endif + +// ABSL_ATTRIBUTE_HOT, ABSL_ATTRIBUTE_COLD +// Tell GCC that a function is hot or cold. GCC can use this information to +// improve static analysis, i.e. a conditional branch to a cold function +// is likely to be not-taken. +// This annotation is used for function declarations, e.g.: +// int foo() ABSL_ATTRIBUTE_HOT; +#if ABSL_HAVE_ATTRIBUTE(hot) || (defined(__GNUC__) && !defined(__clang__)) +#define ABSL_ATTRIBUTE_HOT __attribute__((hot)) +#else +#define ABSL_ATTRIBUTE_HOT +#endif + +#if ABSL_HAVE_ATTRIBUTE(cold) || (defined(__GNUC__) && !defined(__clang__)) +#define ABSL_ATTRIBUTE_COLD __attribute__((cold)) +#else +#define ABSL_ATTRIBUTE_COLD +#endif + +// ABSL_XRAY_ALWAYS_INSTRUMENT, ABSL_XRAY_NEVER_INSTRUMENT, ABSL_XRAY_LOG_ARGS +// +// We define the ABSL_XRAY_ALWAYS_INSTRUMENT and ABSL_XRAY_NEVER_INSTRUMENT +// macro used as an attribute to mark functions that must always or never be +// instrumented by XRay. Currently, this is only supported in Clang/LLVM. +// +// For reference on the LLVM XRay instrumentation, see +// http://llvm.org/docs/XRay.html. +// +// A function with the XRAY_ALWAYS_INSTRUMENT macro attribute in its declaration +// will always get the XRay instrumentation sleds. These sleds may introduce +// some binary size and runtime overhead and must be used sparingly. +// +// These attributes only take effect when the following conditions are met: +// +// - The file/target is built in at least C++11 mode, with a Clang compiler +// that supports XRay attributes. +// - The file/target is built with the -fxray-instrument flag set for the +// Clang/LLVM compiler. +// - The function is defined in the translation unit (the compiler honors the +// attribute in either the definition or the declaration, and must match). +// +// There are cases when, even when building with XRay instrumentation, users +// might want to control specifically which functions are instrumented for a +// particular build using special-case lists provided to the compiler. These +// special case lists are provided to Clang via the +// -fxray-always-instrument=... and -fxray-never-instrument=... flags. The +// attributes in source take precedence over these special-case lists. +// +// To disable the XRay attributes at build-time, users may define +// ABSL_NO_XRAY_ATTRIBUTES. Do NOT define ABSL_NO_XRAY_ATTRIBUTES on specific +// packages/targets, as this may lead to conflicting definitions of functions at +// link-time. +// +#if ABSL_HAVE_CPP_ATTRIBUTE(clang::xray_always_instrument) && \ + !defined(ABSL_NO_XRAY_ATTRIBUTES) +#define ABSL_XRAY_ALWAYS_INSTRUMENT [[clang::xray_always_instrument]] +#define ABSL_XRAY_NEVER_INSTRUMENT [[clang::xray_never_instrument]] +#if ABSL_HAVE_CPP_ATTRIBUTE(clang::xray_log_args) +#define ABSL_XRAY_LOG_ARGS(N) \ + [[clang::xray_always_instrument, clang::xray_log_args(N)]] +#else +#define ABSL_XRAY_LOG_ARGS(N) [[clang::xray_always_instrument]] +#endif +#else +#define ABSL_XRAY_ALWAYS_INSTRUMENT +#define ABSL_XRAY_NEVER_INSTRUMENT +#define ABSL_XRAY_LOG_ARGS(N) +#endif + +// ----------------------------------------------------------------------------- +// Variable Attributes +// ----------------------------------------------------------------------------- + +// ABSL_ATTRIBUTE_UNUSED +// Prevent the compiler from complaining about or optimizing away variables +// that appear unused. +#if ABSL_HAVE_ATTRIBUTE(unused) || (defined(__GNUC__) && !defined(__clang__)) +#undef ABSL_ATTRIBUTE_UNUSED +#define ABSL_ATTRIBUTE_UNUSED __attribute__((__unused__)) +#else +#define ABSL_ATTRIBUTE_UNUSED +#endif +// ABSL_ATTRIBUTE_INITIAL_EXEC +// Tell the compiler to use "initial-exec" mode for a thread-local variable. +// See http://people.redhat.com/drepper/tls.pdf for the gory details. +#if ABSL_HAVE_ATTRIBUTE(tls_model) || (defined(__GNUC__) && !defined(__clang__)) +#define ABSL_ATTRIBUTE_INITIAL_EXEC __attribute__((tls_model("initial-exec"))) +#else +#define ABSL_ATTRIBUTE_INITIAL_EXEC +#endif + +// ABSL_ATTRIBUTE_PACKED +// Prevent the compiler from padding a structure to natural alignment +#if ABSL_HAVE_ATTRIBUTE(packed) || (defined(__GNUC__) && !defined(__clang__)) +#define ABSL_ATTRIBUTE_PACKED __attribute__((__packed__)) +#else +#define ABSL_ATTRIBUTE_PACKED +#endif + +// ABSL_CONST_INIT +// A variable declaration annotated with the ABSL_CONST_INIT attribute will +// not compile (on supported platforms) unless the variable has a constant +// initializer. This is useful for variables with static and thread storage +// duration, because it guarantees that they will not suffer from the so-called +// "static init order fiasco". +// +// Sample usage: +// +// ABSL_CONST_INIT static MyType my_var = MakeMyType(...); +// +// Note that this attribute is redundant if the variable is declared constexpr. +#if ABSL_HAVE_CPP_ATTRIBUTE(clang::require_constant_initialization) +// NOLINTNEXTLINE(whitespace/braces) (b/36288871) +#define ABSL_CONST_INIT [[clang::require_constant_initialization]] +#else +#define ABSL_CONST_INIT +#endif // ABSL_HAVE_CPP_ATTRIBUTE(clang::require_constant_initialization) + +#endif // ABSL_BASE_ATTRIBUTES_H_ |