/* ==========================================================================
 * config.h.guess - Preprocessor-based feature detection
 * --------------------------------------------------------------------------
 * Copyright (c) 2015-2016  William Ahern
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to permit
 * persons to whom the Software is furnished to do so, subject to the
 * following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
 * NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 * ==========================================================================
 */
#ifndef CONFIG_H_GUESS
#define CONFIG_H_GUESS

/*
 * A U T O G U E S S  V E R S I O N
 *
 * Change AG_VENDOR if maintaining a fork.
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#define AG_VENDOR  "william+autoguess@25thandClement.com"
#define AG_VERSION 20170511L


/*
 * C O M P I L E R  V E N D O R / V E R S I O N  D E T E C T I O N
 *
 * See http://sourceforge.net/p/predef/wiki/Compilers/
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#define AG_GNUC_2VER(M, m, p) (((M) * 10000) + ((m) * 100) + (p))
#define AG_GNUC_PREREQ(M, m, p) (__GNUC__ > 0 && AG_GNUC_2VER(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__) >= AG_GNUC_2VER((M), (m), (p)))

#define AG_MSC_2VER(M, m, p) ((((M) + 6) * 10000000) + ((m) * 1000000) + (p))
#define AG_MSC_PREREQ(M, m, p) (_MSC_VER_FULL > 0 && _MSC_VER_FULL >= AG_MSC_2VER((M), (m), (p)))

#define AG_SUNPRO_PREREQ(M, m, p) (__SUNPRO_C > 0 && __SUNPRO_C >= 0x ## M ## m ## p)


/*
 * C O M P I L E R / L A N G U A G E  F E A T U R E  D E T E C T I O N
 *
 * NOTE: The has_ and test_ macros are separate because if the test
 * expression uses the preprocessor "defined" operator the operand
 * identifier may be replaced before the expression is evaluated. Most tests
 * will only use arithmetic operations, but if this is not possible then the
 * test must be written inline, for example
 *
 * 	#if has_attribute(x) || (!HAVE_C___HAS_ATTRIBUTE && defined FOO)
 * 	#define HAVE___ATTRIBUTE___X
 * 	#endif
 *
 * NOTE: Solaris Studio 12.4 supports __has_attribute, but we must enclose
 * it in parentheses because the expansion results in a token sequence that
 * chokes the compiler: __has_attribute(nonnull) becomes
 * __has_attribute__ (nonnull), with a literal space between the preprocessor
 * identifier and the open parenthesis.
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#if defined __has_attribute
#define ag_has_attribute(a) __has_attribute(a)
#define ag_test_attribute(a, E) (ag_has_attribute(a))
#else
#define ag_has_attribute(a) 0
#define ag_test_attribute(a, E) (E)
#endif

#if defined __has_extension
#define ag_has_extension(x) __has_extension(x)
#define ag_test_extension(x, E) (ag_has_extension(x))
#else
#define ag_has_extension(x) 0
#define ag_test_extension(x, E) (E)
#endif

#if defined __has_include
#define ag_has_include(p) __has_include(p)
#define ag_test_include(p, E) (ag_has_include(p))
#else
#define ag_has_include(p) 0
#define ag_test_include(p, E) (E)
#endif

#if defined __has_builtin
#define ag_has_builtin(f) __has_builtin(f)
#define ag_test_builtin(f, E) (ag_has_builtin(f))
#else
#define ag_has_builtin(f) 0
#define ag_test_builtin(f, E) (E)
#endif

#ifndef HAVE_C___ATTRIBUTE__
#define HAVE_C___ATTRIBUTE__ (__GNUC__ || AG_SUNPRO_PREREQ(5,9,0))
#endif

#ifndef HAVE_C___ATTRIBUTE___CONSTRUCTOR
#define HAVE_C___ATTRIBUTE___CONSTRUCTOR ag_test_attribute(constructor, __GNUC__)
#endif

#ifndef HAVE_C___ATTRIBUTE___NONNULL
#define HAVE_C___ATTRIBUTE___NONNULL ag_test_attribute(nonnull, AG_GNUC_PREREQ(3,3,1))
#endif

#ifndef HAVE_C___ATTRIBUTE___UNUSED
#define HAVE_C___ATTRIBUTE___UNUSED ag_test_attribute(unused, __GNUC__)
#endif

#ifndef HAVE_C___ATTRIBUTE___USED
#define HAVE_C___ATTRIBUTE___USED ag_test_attribute(used, __GNUC__)
#endif

#ifndef HAVE_C___ATTRIBUTE___VISIBILITY
#define HAVE_C___ATTRIBUTE___VISIBILITY ag_test_attribute(visibility, __GNUC__)
#endif

#ifndef HAVE_C___HAS_EXTENSION
#define HAVE_C___HAS_EXTENSION (defined __has_extension)
#endif

#ifndef HAVE_C___HAS_INCLUDE
#define HAVE_C___HAS_INCLUDE (defined __has_include)
#endif

#ifndef HAVE_C___EXTENSION__
#define HAVE_C___EXTENSION__ (__GNUC__)
#endif

#ifndef HAVE_C___TYPEOF
#define HAVE_C___TYPEOF (_MSC_VER || __GNUC__ || AG_SUNPRO_PREREQ(5,9,0))
#endif

#ifndef HAVE_C___TYPEOF__
#define HAVE_C___TYPEOF__ (__GNUC__ || __xlc__ || AG_SUNPRO_PREREQ(5,9,0))
#endif

#ifndef HAVE_C__GENERIC
#define HAVE_C__GENERIC ag_test_extension(c_generic_selections, (AG_GNUC_PREREQ(4,9,0) || __STDC_VERSION__ >= 201112L))
#endif

#ifndef HAVE_C_STATEMENT_EXPRESSION
#define HAVE_C_STATEMENT_EXPRESSION (__GNUC__ || AG_SUNPRO_PREREQ(5,9,0))
#endif

#ifndef HAVE_C_TYPEOF
#define HAVE_C_TYPEOF (__GNUC__ || __xlc__ || AG_SUNPRO_PREREQ(5,9,0))
#endif

#ifndef HAVE___ATOMIC_FETCH_ADD
#define HAVE___ATOMIC_FETCH_ADD (defined __ATOMIC_RELAXED)
#endif

#ifndef HAVE___ATOMIC_FETCH_SUB
#define HAVE___ATOMIC_FETCH_SUB HAVE___ATOMIC_FETCH_ADD
#endif

#ifndef HAVE___BUILTIN_CHOOSE_EXPR
#define HAVE___BUILTIN_CHOOSE_EXPR (AG_GNUC_PREREQ(3,1,1) || __clang__)
#endif

#ifndef HAVE___BUILTIN_EXPECT
#define HAVE___BUILTIN_EXPECT ag_test_builtin(__builtin_expect, __GNUC__)
#endif

#ifndef HAVE___BUILTIN_NAN
#define HAVE___BUILTIN_NAN ag_test_builtin(__builtin_nan, AG_GNUC_PREREQ(3,3,1))
#endif

#ifndef HAVE___BUILTIN_TRAP
#define HAVE___BUILTIN_TRAP ag_test_builtin(__builtin_trap, AG_GNUC_PREREQ(3,3,1))
#endif

#ifndef HAVE___BUILTIN_TYPES_COMPATIBLE_P
#define HAVE___BUILTIN_TYPES_COMPATIBLE_P (AG_GNUC_PREREQ(3,1,1) || __clang__)
#endif

#ifndef HAVE___BUILTIN_UNREACHABLE
#define HAVE___BUILTIN_UNREACHABLE ag_test_builtin(__builtin_unreachable, AG_GNUC_PREREQ(4,5,0))
#endif

#ifndef HAVE__STATIC_ASSERT
#define HAVE__STATIC_ASSERT ag_test_extension(c_static_assert, (AG_GNUC_PREREQ(4,6,0) || __C11FEATURES__ || __STDC_VERSION__ >= 201112L))
#endif


/*
 * S Y S T E M  E X T E N S I O N S
 *
 * We must set these before including any headers for feature detection.
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#if AG_USE_SYSTEM_EXTENSIONS

/* Solaris */
#ifndef __EXTENSIONS__
#define __EXTENSIONS__ 1
#endif

/* AIX */
#ifndef _ALL_SOURCE
#define _ALL_SOURCE 1
#endif

#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif

#ifndef _MINIX
#define _MINIX 1
#endif

/* Solaris */
#ifndef _POSIX_PTHREAD_SEMANTICS
#define _POSIX_PTHREAD_SEMANTICS 1
#endif

#endif /* AG_USE_SYSTEM_EXTENSIONS */

#if AG_SYS_LARGEFILE

/* NOTE: BSDs and musl-libc always provide a 64-bit file API */

/* Apple */
#ifndef _DARWIN_USE_64_BIT_INODE
#define _DARWIN_USE_64_BIT_INODE 1
#endif

/* Solaris and glibc (per Large File Summit recommendation) */
#ifndef _FILE_OFFSET_BITS
#define _FILE_OFFSET_BITS 64
#endif

/* AIX */
#ifndef _LARGE_FILES
#define _LARGE_FILES 1
#endif

#endif /* AG_SYS_LARGEFILE */


/*
 * S Y S T E M  D E T E C T I O N  (S T A G E  0)
 *
 * Define HAVE_FOO macros as arithmetic truth values for any predefined
 * system macros which have truth values solely based on whether they're
 * defined.
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/* NOTE: None so far. See stage 3 below. */


/*
 * S Y S T E M  D E T E C T I O N  (S T A G E  1)
 *
 * Include any headers necessary for minimal libc feature checking, defining
 * any prerequisite feature macros.
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * NOTE: <limits.h> will indirectly include <features.h>, <standards.h>,
 * <sys/cdefs.h>, <sys/feature_tests.h>, <sys/featuretest.h>, and similar
 * system headers which define most of what we care about. Among the typical
 * feature macros, we also get _DTRACE_VERSION.
 */
#include <limits.h>

#ifndef AG_MUSL_MAYBE
#define AG_MUSL_MAYBE (__linux__ && !__GLIBC__ && !__BIONIC__)
#endif

#ifndef HAVE_SYS_PARAM_H
#define HAVE_SYS_PARAM_H ag_test_include(<sys/param.h>, !AG_MUSL_MAYBE)
#endif

/*
 * NOTE: Conditionally load <sys/param.h> so we don't unnecessarily pollute
 * the namespace.
 */
#if HAVE_SYS_PARAM_H && !__linux__ && !__sun && !_AIX
#include <sys/param.h> /* __FreeBSD_version __NetBSD_Prereq__ BSD OpenBSD */
#endif

#include <fcntl.h> /* F_DUPFD_CLOEXEC */


/*
 * S Y S T E M  D E T E C T I O N  (S T A G E  2)
 *
 * Macros which determine libc vendor and version.
 *
 * See http://sourceforge.net/p/predef/wiki/Libraries/
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#define AG_AIX_PREREQ(M, m) (_AIX # M # m)

#if defined __GLIBC_PREREQ && !defined __UCLIBC__
#define AG_GLIBC_PREREQ(M, m) (__GLIBC_PREREQ(M, m))
#else
#define AG_GLIBC_PREREQ(M, m) 0
#endif

#define AG_FREEBSD_2VER(M, m, p) (((M) * 100000) + ((m) * 1000) + (p))
#define AG_FREEBSD_PREREQ(M, m, p) (__FreeBSD__ > 0 && __FreeBSD_version >= AG_FREEBSD_2VER((M), (m), (p)))

#define AG_IPHONE_2VER(M, m) (((M) * 10000) + ((m) * 100))
#if defined __IPHONE_OS_VERSION_MIN_REQUIRED
#define AG_IPHONE_PREREQ(M, m) (AG_IPHONE_2VER((M), (m)) <= __IPHONE_OS_VERSION_MIN_REQUIRED)
#else
#define AG_IPHONE_PREREQ(M, m) 0
#endif

#if defined __NetBSD_Prereq__
#define AG_NETBSD_PREREQ(M, m, p) (!__minix && __NetBSD_Prereq__(M, m, p))
#else
#define AG_NETBSD_PREREQ(M, m, p) 0
#endif

#define AG_MACOS_2VER_10_9(M, m, p) (((M) * 100) + ((m) * 10))
#define AG_MACOS_2VER_10_10(M, m, p) (((M) * 10000) + ((m) * 100) + (p))
#define AG_MACOS_PREREQ_10_10(M, m, p) (((M) > 10 || ((M) == 10 && (m) >= 10)) && AG_MACOS_2VER_10_10((M), (m), (p)) <= __MAC_OS_X_VERSION_MIN_REQUIRED)
#define AG_MACOS_PREREQ_10_9(M, m, p) (((M) == 10 && (m) < 10) && AG_MACOS_2VER_10_9((M), (m), (p)) <= __MAC_OS_X_VERSION_MIN_REQUIRED)
#if defined __MAC_OS_X_VERSION_MIN_REQUIRED
#define AG_MACOS_PREREQ(M, m, p) (AG_MACOS_PREREQ_10_10((M), (m), (p)) || AG_MACOS_PREREQ_10_9((M), (m), (p)))
#else
#define AG_MACOS_PREREQ(M, m, p) 0
#endif

#define AG_OPENBSD_PREREQ_0_0 (__OpenBSD__)
#define AG_OPENBSD_PREREQ_5_5 (OpenBSD >= 201405)
#define AG_OPENBSD_PREREQ_5_6 (OpenBSD >= 201411)
#define AG_OPENBSD_PREREQ_5_7 (OpenBSD >= 201505)
#define AG_OPENBSD_PREREQ(M, m) (AG_OPENBSD_PREREQ_ ## M ## _ ## m)

#define AG_SUNOS_PREREQ_5_10 (__sun && _DTRACE_VERSION)
#define AG_SUNOS_PREREQ_5_11 (__sun && F_DUPFD_CLOEXEC)
#define AG_SUNOS_PREREQ(M, m) (AG_SUNOS_PREREQ_ ## M ## _ ## m)

#define AG_UCLIBC_2VER(M, m, p) (((M) * 10000) + ((m) * 100) + (p))
#if defined __UCLIBC__
#define AG_UCLIBC_PREREQ(M, m, p) (AG_UCLIBC_2VER(__UCLIBC_MAJOR__, __UCLIBC_MINOR__, __UCLIBC_SUBLEVEL__) >= AG_UCLIBC_2VER((M), (m), (p)))
#else
#define AG_UCLIBC_PREREQ(M, m, p) 0
#endif


/*
 * S Y S T E M  D E T E C T I O N  (S T A G E  3)
 *
 * Define HAVE_FOO macros as arithmetic truth values for any system macros
 * which have a truth value solely based on whether they're defined.
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifndef HAVE___EXTENSIONS__
#ifdef __EXTENSIONS__
#define HAVE___EXTENSIONS__ 1
#endif
#endif

#ifndef HAVE__ALL_SOURCE
#ifdef _ALL_SOURCE
#define HAVE__ALL_SOURCE 1
#endif
#endif

#ifndef HAVE__GNU_SOURCE
#ifdef _GNU_SOURCE
#define HAVE__GNU_SOURCE 1
#endif
#endif

#ifndef HAVE__MINIX
#if defined _MINIX || (defined __minix && defined _NETBSD_SOURCE)
#define HAVE__MINIX 1
#endif
#endif

#ifndef HAVE__POSIX_PTHREAD_SEMANTICS
#ifdef _POSIX_PTHREAD_SEMANTICS
#define HAVE__POSIX_PTHREAD_SEMANTICS 1
#endif
#endif

#ifndef HAVE__REENTRANT
#ifdef _REENTRANT
#define HAVE__REENTRANT 1
#endif
#endif


/*
 * H E A D E R  D E T E C T I O N
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifndef HAVE_DLFCN_H
#define HAVE_DLFCN_H ag_test_include(<dlfcn.h>, 1)
#endif

#ifndef HAVE_IFADDRS_H
#define HAVE_IFADDRS_H_ (!_AIX && (!__sun || AG_SUNOS_PREREQ(5,11)))
#define HAVE_IFADDRS_H ag_test_include(<ifaddrs.h>, HAVE_IFADDRS_H_)
#endif

#ifndef HAVE_INTTYPES_H
#define HAVE_INTTYPES_H 1
#endif

#ifndef HAVE_MACH_CLOCK_H
#define HAVE_MACH_CLOCK_H ag_test_include(<mach/clock.h>, __APPLE__)
#endif

#ifndef HAVE_MACH_MACH_H
#define HAVE_MACH_MACH_H ag_test_include(<mach/mach.h>, __APPLE__)
#endif

#ifndef HAVE_MACH_MACH_TIME_H
#define HAVE_MACH_MACH_TIME_H ag_test_include(<mach/mach_time.h>, __APPLE__)
#endif

#ifndef HAVE_MEMORY_H
#define HAVE_MEMORY_H 1
#endif

#ifndef HAVE_PORT_H
#define HAVE_PORT_H ag_test_include(<port.h>, AG_SUNOS_PREREQ(5,10))
#endif

/* TODO: Maybe test _POSIX_THREADS from <unistd.h>. */
#ifndef HAVE_PTHREAD_H
#define HAVE_PTHREAD_H ag_test_include(<pthread.h>, !__minix)
#endif

#ifndef HAVE_STDINT_H
#define HAVE_STDINT_H 1
#endif

#ifndef HAVE_STDLIB_H
#define HAVE_STDLIB_H 1
#endif

#ifndef HAVE_STRING_H
#define HAVE_STRING_H 1
#endif

#ifndef HAVE_STRINGS_H
#define HAVE_STRINGS_H 1
#endif

#ifndef HAVE_SYS_AUXV_H
#define HAVE_SYS_AUXV_H_ (AG_GLIBC_PREREQ(2,16) || (!AG_GLIBC_PREREQ(0,0) && __linux__) || __sun)
#define HAVE_SYS_AUXV_H ag_test_include(<sys/auxv.h>, HAVE_SYS_AUXV_H_)
#endif

#ifndef HAVE_SYS_EPOLL_H
#define HAVE_SYS_EPOLL_H ag_test_include(<sys/epoll.h>, __linux__)
#endif

#ifndef HAVE_SYS_EVENT_H
#define HAVE_SYS_EVENT_H ag_test_include(<sys/event.h>, BSD)
#endif

#ifndef HAVE_SYS_EVENTFD_H
#define HAVE_SYS_EVENTFD_H_ (AG_GLIBC_PREREQ(2,8) || (!AG_GLIBC_PREREQ(0,0) && __linux__) || defined EFD_CLOEXEC)
#define HAVE_SYS_EVENTFD_H ag_test_include(<sys/eventfd.h>, HAVE_SYS_EVENTFD_H_)
#endif

#ifndef HAVE_SYS_INOTIFY_H
#define HAVE_SYS_INOTIFY_H ag_test_include(<sys/inotify.h>, __linux__)
#endif

#ifndef HAVE_SYS_RANDOM_H
#define HAVE_SYS_RANDOM_H_ (__sun && defined SYS_getrandom) /* requires #include <sys/syscall.h> :( */
#define HAVE_SYS_RANDOM_H ag_test_include(<sys/random.h>, HAVE_SYS_RANDOM_H_)
#endif

#ifndef HAVE_SYS_SIGNALFD_H
#define HAVE_SYS_SIGNALFD_H_ (AG_GLIBC_PREREQ(2,8) || (!AG_GLIBC_PREREQ(0,0) && __linux__) || defined SFD_CLOEXEC)
#define HAVE_SYS_SIGNALFD_H ag_test_include(<sys/signalfd.h>, HAVE_SYS_SIGNALFD_H_)
#endif

#ifndef HAVE_SYS_SOCKIO_H
#define HAVE_SYS_SOCKIO_H ag_test_include(<sys/sockio.h>, (__sun || BSD))
#endif

#ifndef HAVE_SYS_STAT_H
#define HAVE_SYS_STAT_H 1
#endif

#ifndef HAVE_SYS_SYSCALL_H
#define HAVE_SYS_SYSCALL_H_ (BSD || __linux__ || __sun)
#define HAVE_SYS_SYSCALL_H ag_test_include(<sys/syscall.h>, HAVE_SYS_SYSCALL_H_)
#endif

#ifndef HAVE_SYS_SYSCTL_H
#define HAVE_SYS_SYSCTL_H ag_test_include(<sys/sysctl.h>, (BSD || __GLIBC__))
#endif

#ifndef HAVE_SYS_TIMERFD_H
#define HAVE_SYS_TIMERFD_H_  (AG_GLIBC_PREREQ(2,8) || (!AG_GLIBC_PREREQ(0,0) && __linux__) || defined TFD_CLOEXEC)
#define HAVE_SYS_TIMERFD_H ag_test_include(<sys/timerfd.h>, HAVE_SYS_TIMERFD_H_)
#endif

#ifndef HAVE_SYS_TYPES_H
#define HAVE_SYS_TYPES_H 1
#endif

#ifndef HAVE_UNISTD_H
#define HAVE_UNISTD_H 1
#endif


/*
 * T Y P E  D E T E C T I O N
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifndef HAVE_CLOCKID_T
#define HAVE_CLOCKID_T (defined CLOCK_MONOTONIC)
#endif

#ifndef HAVE_STRUCT_SOCKADDR_SA_LEN
#define HAVE_STRUCT_SOCKADDR_SA_LEN (!__linux__ && !__sun)
#endif

#ifndef HAVE_STRUCT_STAT_ST_ATIM
#define HAVE_STRUCT_STAT_ST_ATIM (defined st_atime && ((!__APPLE__ && (!__NetBSD__ || AG_NETBSD_PREREQ(7,0,0))) || !HAVE_STRUCT_STAT_ST_ATIMESPEC))
#endif

#ifndef HAVE_STRUCT_STAT_ST_CTIM
#define HAVE_STRUCT_STAT_ST_CTIM HAVE_STRUCT_STAT_ST_ATIM
#endif

#ifndef HAVE_STRUCT_STAT_ST_MTIM
#define HAVE_STRUCT_STAT_ST_MTIM HAVE_STRUCT_STAT_ST_ATIM
#endif

#ifndef HAVE_STRUCT_STAT_ST_ATIMESPEC
#define HAVE_STRUCT_STAT_ST_ATIMESPEC (__APPLE__ || defined st_atimespec || defined st_atimensec)
#endif

#ifndef HAVE_STRUCT_STAT_ST_CTIMESPEC
#define HAVE_STRUCT_STAT_ST_CTIMESPEC HAVE_STRUCT_STAT_ST_ATIMESPEC
#endif

#ifndef HAVE_STRUCT_STAT_ST_MTIMESPEC
#define HAVE_STRUCT_STAT_ST_MTIMESPEC HAVE_STRUCT_STAT_ST_ATIMESPEC
#endif

#ifndef HAVE_STRUCT_STAT_ST_BLOCKS
#define HAVE_STRUCT_STAT_ST_BLOCKS 1
#endif

#ifndef HAVE_STRUCT_STAT_ST_BLKSIZE
#define HAVE_STRUCT_STAT_ST_BLKSIZE 1
#endif

#ifndef HAVE_STRUCT_STAT_ST_RDEV
#define HAVE_STRUCT_STAT_ST_RDEV 1
#endif


/*
 * D E C L A R A T I O N  D E T E C T I O N
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifndef HAVE___DECL_LIBC_ENABLE_SECURE
#define HAVE___DECL_LIBC_ENABLE_SECURE 0
#endif

#ifndef HAVE_DECL_CLOCK_GETTIME
#define HAVE_DECL_CLOCK_GETTIME HAVE_DECL_CLOCK_MONOTONIC
#endif

#ifndef HAVE_DECL_CLOCK_MONOTONIC
#define HAVE_DECL_CLOCK_MONOTONIC (defined CLOCK_MONOTONIC)
#endif

#ifndef HAVE_DECL_CLOCK_REALTIME
#define HAVE_DECL_CLOCK_REALTIME (defined CLOCK_REALTIME)
#endif

#ifndef HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME
#define HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME (__linux__ && HAVE__GNU_SOURCE)
#endif

#ifndef HAVE_DECL_PTHREAD_MUTEX_ROBUST
#define HAVE_DECL_PTHREAD_MUTEX_ROBUST (defined PTHREAD_MUTEX_ROBUST || AG_GLIBC_PREREQ(2,12))
#endif

#ifndef HAVE_DECL_RANDOM_UUID
#define HAVE_DECL_RANDOM_UUID (HAVE_SYS_SYSCTL_H && defined __linux__) /* RANDOM_UUID is an enum, not macro */
#endif

#ifndef HAVE_DECL_STRERROR_R
#define HAVE_DECL_STRERROR_R 1
#endif

#ifndef HAVE_DECL_SYS_SIGLIST
#define HAVE_DECL_SYS_SIGLIST (!AG_MUSL_MAYBE && !__sun && !_AIX)
#endif

#ifndef HAVE_DECL_SYS_GETRANDOM
#define HAVE_DECL_SYS_GETRANDOM (defined SYS_getrandom)
#endif


/*
 * V A R I A B L E  D E T E C T I O N
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifndef HAVE___LIBC_ENABLE_SECURE
#define HAVE___LIBC_ENABLE_SECURE AG_GLIBC_PREREQ(2,1) /* added to glibc between 2.0.98 and 2.0.99 */
#endif

#ifndef HAVE_PROGRAM_INVOCATION_SHORT_NAME
#define HAVE_PROGRAM_INVOCATION_SHORT_NAME (__linux__)
#endif

#ifndef HAVE_SYS_SIGLIST
#define HAVE_SYS_SIGLIST HAVE_DECL_SYS_SIGLIST
#endif


/*
 * F U N C T I O N  D E T E C T I O N
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifndef HAVE_ACCEPT4
#define HAVE_ACCEPT4 (defined SOCK_CLOEXEC && !__NetBSD__)
#endif

#ifndef HAVE_ARC4RANDOM
#define HAVE_ARC4RANDOM \
	(__APPLE__ || __DragonFly__ || __FreeBSD__ || __NetBSD__ || \
	 __OpenBSD__ || __minix)
#endif

#ifndef HAVE_ARC4RANDOM_ADDRANDOM
#define HAVE_ARC4RANDOM_ADDRANDOM (HAVE_ARC4RANDOM && !AG_OPENBSD_PREREQ(5,5))
#endif

#ifndef HAVE_ARC4RANDOM_BUF
#define HAVE_ARC4RANDOM_BUF_APPLE_ (!__APPLE__ || AG_MACOS_PREREQ(10,7,0) || AG_IPHONE_PREREQ(4,3))
#define HAVE_ARC4RANDOM_BUF_NETBSD_ (!__NetBSD__ || AG_NETBSD_PREREQ(6,0,0))
#define HAVE_ARC4RANDOM_BUF_IFF_ (HAVE_ARC4RANDOM_BUF_APPLE_ && HAVE_ARC4RANDOM_BUF_NETBSD_)
#define HAVE_ARC4RANDOM_BUF (HAVE_ARC4RANDOM && HAVE_ARC4RANDOM_BUF_IFF_)
#endif

#ifndef HAVE_ARC4RANDOM_STIR
#define HAVE_ARC4RANDOM_STIR HAVE_ARC4RANDOM_ADDRANDOM
#endif

#ifndef HAVE_CLOCK_GETTIME
#define HAVE_CLOCK_GETTIME (!__APPLE__ || AG_MACOS_PREREQ(10,12,0))
#endif

#ifndef HAVE_DLADDR
#define HAVE_DLADDR (HAVE_DLOPEN && !_AIX && ((!__GLIBC__ && !AG_MUSL_MAYBE) || HAVE__GNU_SOURCE))
#endif

#ifndef HAVE_DLOPEN
#define HAVE_DLOPEN HAVE_DLFCN_H
#endif

#ifndef HAVE_DLSYM
#define HAVE_DLSYM HAVE_DLOPEN
#endif

#ifndef HAVE_DUP2
#define HAVE_DUP2 1
#endif

#ifndef HAVE_DUP3
#define HAVE_DUP3 (AG_GLIBC_PREREQ(2,9) || AG_FREEBSD_PREREQ(10,0,0) || AG_NETBSD_PREREQ(6,0,0) || AG_UCLIBC_PREREQ(0,9,34) || AG_MUSL_MAYBE || __BIONIC__ || AG_OPENBSD_PREREQ(5,7))
#endif

#ifndef HAVE_FDOPENDIR
#define HAVE_FDOPENDIR ( \
	(!__APPLE__ || AG_MACOS_PREREQ(10,10,0) || AG_IPHONE_PREREQ(8,0)) \
	&& (!__NetBSD__ || AG_NETBSD_PREREQ(6,0,0)) \
)
#endif

#ifndef HAVE_EPOLL_CREATE
#define HAVE_EPOLL_CREATE HAVE_SYS_EPOLL_H
#endif

#if HAVE_SYS_EPOLL_H
#include <sys/epoll.h>
#endif

#ifndef HAVE_EPOLL_CREATE1
#define HAVE_EPOLL_CREATE1 (HAVE_EPOLL_CREATE && (defined EPOLL_CLOEXEC || AG_GLIBC_PREREQ(2,9)))
#endif

#ifndef HAVE_EPOLL_CTL
#define HAVE_EPOLL_CTL HAVE_EPOLL_CREATE
#endif

#ifndef HAVE_EPOLL_PWAIT
#define HAVE_EPOLL_PWAIT (HAVE_EPOLL_WAIT && (AG_GLIBC_PREREQ(2,6) || (!AG_GLIBC_PREREQ(0,0) && defined EPOLL_CLOEXEC)))
#endif

#ifndef HAVE_EPOLL_WAIT
#define HAVE_EPOLL_WAIT HAVE_EPOLL_CREATE
#endif

#ifndef HAVE_EVENTFD
#define HAVE_EVENTFD HAVE_SYS_EVENTFD_H
#endif

#ifndef HAVE_GETAUXVAL
#define HAVE_GETAUXVAL (HAVE_SYS_AUXV_H && !__sun)
#endif

#ifndef HAVE_GETENTROPY
#define HAVE_GETENTROPY (AG_OPENBSD_PREREQ(5,6) || (HAVE_SYS_RANDOM_H && __sun))
#endif

#ifndef HAVE_GETENV_R
#define HAVE_GETENV_R (AG_NETBSD_PREREQ(4,0,0) || __minix)
#endif

#ifndef HAVE_GETEXECNAME
#define HAVE_GETEXECNAME (__sun)
#endif

#ifndef HAVE_GETIFADDRS
#define HAVE_GETIFADDRS (HAVE_IFADDRS_H && !__sun)
#endif

#ifndef HAVE_GETPROGNAME
#define HAVE_GETPROGNAME (HAVE_ARC4RANDOM || AG_SUNOS_PREREQ(5,11))
#endif

#ifndef HAVE_GETRANDOM
#define HAVE_GETRANDOM (HAVE_SYS_RANDOM_H && __sun)
#endif

#ifndef HAVE_INOTIFY_INIT
#define HAVE_INOTIFY_INIT HAVE_SYS_INOTIFY_H
#endif

#ifndef HAVE_INOTIFY_INIT1
#define HAVE_INOTIFY_INIT1 (HAVE_INOTIFY_INIT && defined IN_CLOEXEC)
#endif

#ifndef HAVE_ISSETUGID
#define HAVE_ISSETUGID ((!__linux__ || (AG_MUSL_MAYBE && HAVE__GNU_SOURCE)) && !_AIX)
#endif

#if HAVE_SYS_EVENT_H
#include <sys/event.h>
#endif

#ifndef HAVE_KEVENT
#define HAVE_KEVENT (defined EV_SET)
#endif

#ifndef HAVE_KQUEUE
#define HAVE_KQUEUE HAVE_KEVENT
#endif

#ifndef HAVE_KQUEUE1
#define HAVE_KQUEUE1 (HAVE_KQUEUE && AG_NETBSD_PREREQ(6,0,0))
#endif

#ifndef HAVE_OPENAT
#define HAVE_OPENAT \
	((!__APPLE__ || AG_MACOS_PREREQ(10,10,0) || AG_IPHONE_PREREQ(8,0)) \
	 && (!__NetBSD__ || AG_NETBSD_PREREQ(7,0,0)))
#endif

#ifndef HAVE_MKDIRAT
#define HAVE_MKDIRAT HAVE_OPENAT
#endif

#ifndef HAVE_MKFIFOAT
#define HAVE_MKFIFOAT (!__APPLE__ && (!__NetBSD__ || AG_NETBSD_PREREQ(7,0,0)))
#endif

#ifndef HAVE_PACCEPT
#define HAVE_PACCEPT AG_NETBSD_PREREQ(6,0,0)
#endif

#ifndef HAVE_PIPE2
#define HAVE_PIPE2 (AG_GLIBC_PREREQ(2,9) || AG_FREEBSD_PREREQ(10,0,0) || AG_NETBSD_PREREQ(6,0,0) || AG_UCLIBC_PREREQ(0,9,32) || AG_MUSL_MAYBE || __BIONIC__ || AG_OPENBSD_PREREQ(5,7))
#endif

#ifndef HAVE_PORT_ALERT
#define HAVE_PORT_ALERT HAVE_PORT_CREATE
#endif

#ifndef HAVE_PORT_ASSOCIATE
#define HAVE_PORT_ASSOCIATE HAVE_PORT_CREATE
#endif

#ifndef HAVE_PORT_CREATE
#define HAVE_PORT_CREATE HAVE_PORT_H
#endif

#ifndef HAVE_PORT_DISSOCIATE
#define HAVE_PORT_DISSOCIATE HAVE_PORT_CREATE
#endif

#ifndef HAVE_PORT_GET
#define HAVE_PORT_GET HAVE_PORT_CREATE
#endif

#ifndef HAVE_PORT_GETN
#define HAVE_PORT_GETN HAVE_PORT_CREATE
#endif

#ifndef HAVE_PORT_SEND
#define HAVE_PORT_SEND HAVE_PORT_CREATE
#endif

#ifndef HAVE_PORT_SENDN
#define HAVE_PORT_SENDN HAVE_PORT_CREATE
#endif

#ifndef HAVE_POSIX_FADVISE
#define HAVE_POSIX_FADVISE (defined POSIX_FADV_NORMAL || AG_GLIBC_PREREQ(2,2) || __sun || AG_MUSL_MAYBE || AG_FREEBSD_PREREQ(9,0,0))
#endif

#ifndef HAVE_POSIX_FALLOCATE
#define HAVE_POSIX_FALLOCATE (_AIX || AG_FREEBSD_PREREQ(9,0,0) || AG_GLIBC_PREREQ(2,2) || AG_MUSL_MAYBE || AG_NETBSD_PREREQ(7,0,0) || __sun)
#endif

#ifndef HAVE_RENAMEAT
#define HAVE_RENAMEAT HAVE_OPENAT
#endif

#ifndef HAVE_SIGNALFD
#define HAVE_SIGNALFD HAVE_SYS_SIGNALFD_H
#endif

#ifndef HAVE_SIGTIMEDWAIT
#define HAVE_SIGTIMEDWAIT (!__APPLE__ && !__OpenBSD__)
#endif

#ifndef HAVE_SIGWAIT
#define HAVE_SIGWAIT (!__minix)
#endif

#ifndef HAVE_STATIC_ASSERT
#if AG_GLIBC_PREREQ(0,0) && !HAVE__STATIC_ASSERT
#define HAVE_STATIC_ASSERT 0 /* glibc doesn't check GCC version */
#else
#define HAVE_STATIC_ASSERT (defined static_assert)
#endif
#endif

#ifndef HAVE_STRERROR_R
#define HAVE_STRERROR_R 1
#endif

#ifndef HAVE_SYSCALL
#define HAVE_SYSCALL HAVE_SYS_SYSCALL_H
#endif

#ifndef HAVE_SYSCTL
#define HAVE_SYSCTL HAVE_SYS_SYSCTL_H
#endif

#ifndef HAVE_TIMERFD_CREATE
#define HAVE_TIMERFD_CREATE HAVE_SYS_TIMERFD_H
#endif

#ifndef HAVE_TIMERFD_GETTIME
#define HAVE_TIMERFD_GETTIME HAVE_TIMERFD_CREATE
#endif

#ifndef HAVE_TIMERFD_SETTIME
#define HAVE_TIMERFD_SETTIME HAVE_TIMERFD_CREATE
#endif

#ifndef HAVE_UNLINKAT
#define HAVE_UNLINKAT HAVE_OPENAT
#endif

#ifndef STRERROR_R_CHAR_P
#define STRERROR_R_CHAR_P ((AG_GLIBC_PREREQ(0,0) || AG_UCLIBC_PREREQ(0,0,0)) && (HAVE__GNU_SOURCE || !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)))
#endif


#endif /* CONFIG_H_GUESS */