CMake/CurlTests.c - platform/external/curl - Git at Google

 /***************************************************************************
  *                                  _   _ ____  _
  *  Project                     ___| | | |  _ \| |
  *                             / __| | | | |_) | |
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
  * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
  * are also available at https://curl.se/docs/copyright.html.
  *
  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  * copies of the Software, and permit persons to whom the Software is
  * furnished to do so, under the terms of the COPYING file.
  *
  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  * KIND, either express or implied.
  *
  ***************************************************************************/
 #ifdef TIME_WITH_SYS_TIME
 /* Time with sys/time test */

 #include <sys/types.h>
 #include <sys/time.h>
 #include <time.h>

 int
 main ()
 {
 if ((struct tm *) 0)
 return 0;
   ;
   return 0;
 }

 #endif

 #ifdef HAVE_FCNTL_O_NONBLOCK

 /* headers for FCNTL_O_NONBLOCK test */
 #include <sys/types.h>
 #include <unistd.h>
 #include <fcntl.h>
 /* */
 #if defined(sun) || defined(__sun__) || \
     defined(__SUNPRO_C) || defined(__SUNPRO_CC)
 # if defined(__SVR4) || defined(__srv4__)
 #  define PLATFORM_SOLARIS
 # else
 #  define PLATFORM_SUNOS4
 # endif
 #endif
 #if (defined(_AIX) || defined(__xlC__)) && !defined(_AIX41)
 # define PLATFORM_AIX_V3
 #endif
 /* */
 #if defined(PLATFORM_SUNOS4) || defined(PLATFORM_AIX_V3) || defined(__BEOS__)
 #error "O_NONBLOCK does not work on this platform"
 #endif

 int
 main ()
 {
       /* O_NONBLOCK source test */
       int flags = 0;
       if(0 != fcntl(0, F_SETFL, flags | O_NONBLOCK))
           return 1;
       return 0;
 }
 #endif

 /* tests for gethostbyname_r */
 #if defined(HAVE_GETHOSTBYNAME_R_3_REENTRANT) || \
     defined(HAVE_GETHOSTBYNAME_R_5_REENTRANT) || \
     defined(HAVE_GETHOSTBYNAME_R_6_REENTRANT)
 #   define _REENTRANT
     /* no idea whether _REENTRANT is always set, just invent a new flag */
 #   define TEST_GETHOSTBYFOO_REENTRANT
 #endif
 #if defined(HAVE_GETHOSTBYNAME_R_3) || \
     defined(HAVE_GETHOSTBYNAME_R_5) || \
     defined(HAVE_GETHOSTBYNAME_R_6) || \
     defined(TEST_GETHOSTBYFOO_REENTRANT)
 #include <sys/types.h>
 #include <netdb.h>
 int main(void)
 {
   char *address = "example.com";
   int length = 0;
   int type = 0;
   struct hostent h;
   int rc = 0;
 #if defined(HAVE_GETHOSTBYNAME_R_3) || \
     defined(HAVE_GETHOSTBYNAME_R_3_REENTRANT)
   struct hostent_data hdata;
 #elif defined(HAVE_GETHOSTBYNAME_R_5) || \
       defined(HAVE_GETHOSTBYNAME_R_5_REENTRANT) || \
       defined(HAVE_GETHOSTBYNAME_R_6) || \
       defined(HAVE_GETHOSTBYNAME_R_6_REENTRANT)
   char buffer[8192];
   int h_errnop;
   struct hostent *hp;
 #endif

 #if   defined(HAVE_GETHOSTBYNAME_R_3) || \
       defined(HAVE_GETHOSTBYNAME_R_3_REENTRANT)
   rc = gethostbyname_r(address, &h, &hdata);
 #elif defined(HAVE_GETHOSTBYNAME_R_5) || \
       defined(HAVE_GETHOSTBYNAME_R_5_REENTRANT)
   rc = gethostbyname_r(address, &h, buffer, 8192, &h_errnop);
   (void)hp; /* not used for test */
 #elif defined(HAVE_GETHOSTBYNAME_R_6) || \
       defined(HAVE_GETHOSTBYNAME_R_6_REENTRANT)
   rc = gethostbyname_r(address, &h, buffer, 8192, &hp, &h_errnop);
 #endif

   (void)length;
   (void)type;
   (void)rc;
   return 0;
 }
 #endif

 #ifdef HAVE_SOCKLEN_T
 #ifdef _WIN32
 #include <ws2tcpip.h>
 #else
 #include <sys/types.h>
 #include <sys/socket.h>
 #endif
 int
 main ()
 {
 if ((socklen_t *) 0)
   return 0;
 if (sizeof (socklen_t))
   return 0;
   ;
   return 0;
 }
 #endif
 #ifdef HAVE_IN_ADDR_T
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>

 int
 main ()
 {
 if ((in_addr_t *) 0)
   return 0;
 if (sizeof (in_addr_t))
   return 0;
   ;
   return 0;
 }
 #endif

 #ifdef HAVE_BOOL_T
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_STDBOOL_H
 #include <stdbool.h>
 #endif
 int
 main ()
 {
 if (sizeof (bool *) )
   return 0;
   ;
   return 0;
 }
 #endif

 #ifdef STDC_HEADERS
 #include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
 #include <float.h>
 int main() { return 0; }
 #endif
 #ifdef HAVE_GETADDRINFO
 #include <netdb.h>
 #include <sys/types.h>
 #include <sys/socket.h>

 int main(void) {
     struct addrinfo hints, *ai;
     int error;

     memset(&hints, 0, sizeof(hints));
     hints.ai_family = AF_UNSPEC;
     hints.ai_socktype = SOCK_STREAM;
 #ifndef getaddrinfo
     (void)getaddrinfo;
 #endif
     error = getaddrinfo("127.0.0.1", "8080", &hints, &ai);
     if (error) {
         return 1;
     }
     return 0;
 }
 #endif
 #ifdef HAVE_FILE_OFFSET_BITS
 #ifdef _FILE_OFFSET_BITS
 #undef _FILE_OFFSET_BITS
 #endif
 #define _FILE_OFFSET_BITS 64
 #include <sys/types.h>
  /* Check that off_t can represent 2**63 - 1 correctly.
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
 #define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
                        && LARGE_OFF_T % 2147483647 == 1)
                       ? 1 : -1];
 int main () { ; return 0; }
 #endif
 #ifdef HAVE_IOCTLSOCKET
 /* includes start */
 #ifdef HAVE_WINDOWS_H
 #  ifndef WIN32_LEAN_AND_MEAN
 #    define WIN32_LEAN_AND_MEAN
 #  endif
 #  include <windows.h>
 #  ifdef HAVE_WINSOCK2_H
 #    include <winsock2.h>
 #  else
 #    ifdef HAVE_WINSOCK_H
 #      include <winsock.h>
 #    endif
 #  endif
 #endif

 int
 main ()
 {

 /* ioctlsocket source code */
  int socket;
  unsigned long flags = ioctlsocket(socket, FIONBIO, &flags);

   ;
   return 0;
 }

 #endif
 #ifdef HAVE_IOCTLSOCKET_CAMEL
 /* includes start */
 #ifdef HAVE_WINDOWS_H
 #  ifndef WIN32_LEAN_AND_MEAN
 #    define WIN32_LEAN_AND_MEAN
 #  endif
 #  include <windows.h>
 #  ifdef HAVE_WINSOCK2_H
 #    include <winsock2.h>
 #  else
 #    ifdef HAVE_WINSOCK_H
 #      include <winsock.h>
 #    endif
 #  endif
 #endif

 int
 main ()
 {

 /* IoctlSocket source code */
     if(0 != IoctlSocket(0, 0, 0))
       return 1;
   ;
   return 0;
 }
 #endif
 #ifdef HAVE_IOCTLSOCKET_CAMEL_FIONBIO
 /* includes start */
 #ifdef HAVE_WINDOWS_H
 #  ifndef WIN32_LEAN_AND_MEAN
 #    define WIN32_LEAN_AND_MEAN
 #  endif
 #  include <windows.h>
 #  ifdef HAVE_WINSOCK2_H
 #    include <winsock2.h>
 #  else
 #    ifdef HAVE_WINSOCK_H
 #      include <winsock.h>
 #    endif
 #  endif
 #endif

 int
 main ()
 {

 /* IoctlSocket source code */
         long flags = 0;
         if(0 != IoctlSocket(0, FIONBIO, &flags))
           return 1;
   ;
   return 0;
 }
 #endif
 #ifdef HAVE_IOCTLSOCKET_FIONBIO
 /* includes start */
 #ifdef HAVE_WINDOWS_H
 #  ifndef WIN32_LEAN_AND_MEAN
 #    define WIN32_LEAN_AND_MEAN
 #  endif
 #  include <windows.h>
 #  ifdef HAVE_WINSOCK2_H
 #    include <winsock2.h>
 #  else
 #    ifdef HAVE_WINSOCK_H
 #      include <winsock.h>
 #    endif
 #  endif
 #endif

 int
 main ()
 {

         int flags = 0;
         if(0 != ioctlsocket(0, FIONBIO, &flags))
           return 1;

   ;
   return 0;
 }
 #endif
 #ifdef HAVE_IOCTL_FIONBIO
 /* headers for FIONBIO test */
 /* includes start */
 #ifdef HAVE_SYS_TYPES_H
 #  include <sys/types.h>
 #endif
 #ifdef HAVE_UNISTD_H
 #  include <unistd.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #  include <sys/socket.h>
 #endif
 #ifdef HAVE_SYS_IOCTL_H
 #  include <sys/ioctl.h>
 #endif
 #ifdef HAVE_STROPTS_H
 #  include <stropts.h>
 #endif

 int
 main ()
 {

         int flags = 0;
         if(0 != ioctl(0, FIONBIO, &flags))
           return 1;

   ;
   return 0;
 }
 #endif
 #ifdef HAVE_IOCTL_SIOCGIFADDR
 /* headers for FIONBIO test */
 /* includes start */
 #ifdef HAVE_SYS_TYPES_H
 #  include <sys/types.h>
 #endif
 #ifdef HAVE_UNISTD_H
 #  include <unistd.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #  include <sys/socket.h>
 #endif
 #ifdef HAVE_SYS_IOCTL_H
 #  include <sys/ioctl.h>
 #endif
 #ifdef HAVE_STROPTS_H
 #  include <stropts.h>
 #endif
 #include <net/if.h>

 int
 main ()
 {
         struct ifreq ifr;
         if(0 != ioctl(0, SIOCGIFADDR, &ifr))
           return 1;

   ;
   return 0;
 }
 #endif
 #ifdef HAVE_SETSOCKOPT_SO_NONBLOCK
 /* includes start */
 #ifdef HAVE_WINDOWS_H
 #  ifndef WIN32_LEAN_AND_MEAN
 #    define WIN32_LEAN_AND_MEAN
 #  endif
 #  include <windows.h>
 #  ifdef HAVE_WINSOCK2_H
 #    include <winsock2.h>
 #  else
 #    ifdef HAVE_WINSOCK_H
 #      include <winsock.h>
 #    endif
 #  endif
 #endif
 /* includes start */
 #ifdef HAVE_SYS_TYPES_H
 #  include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #  include <sys/socket.h>
 #endif
 /* includes end */

 int
 main ()
 {
         if(0 != setsockopt(0, SOL_SOCKET, SO_NONBLOCK, 0, 0))
           return 1;
   ;
   return 0;
 }
 #endif
 #ifdef HAVE_GLIBC_STRERROR_R
 #include <string.h>
 #include <errno.h>

 void check(char c) {}

 int
 main () {
   char buffer[1024];
   /* This will not compile if strerror_r does not return a char* */
   check(strerror_r(EACCES, buffer, sizeof(buffer))[0]);
   return 0;
 }
 #endif
 #ifdef HAVE_POSIX_STRERROR_R
 #include <string.h>
 #include <errno.h>

 /* float, because a pointer can't be implicitly cast to float */
 void check(float f) {}

 int
 main () {
   char buffer[1024];
   /* This will not compile if strerror_r does not return an int */
   check(strerror_r(EACCES, buffer, sizeof(buffer)));
   return 0;
 }
 #endif
 #ifdef HAVE_FSETXATTR_6
 #include <sys/xattr.h> /* header from libc, not from libattr */
 int
 main() {
   fsetxattr(0, 0, 0, 0, 0, 0);
   return 0;
 }
 #endif
 #ifdef HAVE_FSETXATTR_5
 #include <sys/xattr.h> /* header from libc, not from libattr */
 int
 main() {
   fsetxattr(0, 0, 0, 0, 0);
   return 0;
 }
 #endif
 #ifdef HAVE_CLOCK_GETTIME_MONOTONIC
 #include <time.h>
 int
 main() {
   struct timespec ts = {0, 0};
   clock_gettime(CLOCK_MONOTONIC, &ts);
   return 0;
 }
 #endif
 #ifdef HAVE_BUILTIN_AVAILABLE
 int
 main() {
   if(__builtin_available(macOS 10.12, *)) {}
   return 0;
 }
 #endif
 #ifdef HAVE_VARIADIC_MACROS_C99
 #define c99_vmacro3(first, ...) fun3(first, __VA_ARGS__)
 #define c99_vmacro2(first, ...) fun2(first, __VA_ARGS__)

 int fun3(int arg1, int arg2, int arg3);
 int fun2(int arg1, int arg2);

 int fun3(int arg1, int arg2, int arg3) {
   return arg1 + arg2 + arg3;
 }
 int fun2(int arg1, int arg2) {
   return arg1 + arg2;
 }

 int
 main() {
   int res3 = c99_vmacro3(1, 2, 3);
   int res2 = c99_vmacro2(1, 2);
   (void)res3;
   (void)res2;
   return 0;
 }
 #endif
 #ifdef HAVE_VARIADIC_MACROS_GCC
 #define gcc_vmacro3(first, args...) fun3(first, args)
 #define gcc_vmacro2(first, args...) fun2(first, args)

 int fun3(int arg1, int arg2, int arg3);
 int fun2(int arg1, int arg2);

 int fun3(int arg1, int arg2, int arg3) {
   return arg1 + arg2 + arg3;
 }
 int fun2(int arg1, int arg2) {
   return arg1 + arg2;
 }

 int
 main() {
   int res3 = gcc_vmacro3(1, 2, 3);
   int res2 = gcc_vmacro2(1, 2);
   (void)res3;
   (void)res2;
   return 0;
 }
 #endif
	/***************************************************************************
	* _ _ ____ _
	* Project ___\| \| \| \| _ \\| \|
	* / __\| \| \| \| \|_) \| \|
	* \| (__\| \|_\| \| _ <\| \|___
	* \___\|\___/\|_\| \_\_____\|
	*
	* Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, et al.
	*
	* This software is licensed as described in the file COPYING, which
	* you should have received as part of this distribution. The terms
	* are also available at https://curl.se/docs/copyright.html.
	*
	* You may opt to use, copy, modify, merge, publish, distribute and/or sell
	* copies of the Software, and permit persons to whom the Software is
	* furnished to do so, under the terms of the COPYING file.
	*
	* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
	* KIND, either express or implied.
	*
	***************************************************************************/
	#ifdef TIME_WITH_SYS_TIME
	/* Time with sys/time test */

	#include <sys/types.h>
	#include <sys/time.h>
	#include <time.h>

	int
	main ()
	{
	if ((struct tm *) 0)
	return 0;
	;
	return 0;
	}

	#endif

	#ifdef HAVE_FCNTL_O_NONBLOCK

	/* headers for FCNTL_O_NONBLOCK test */
	#include <sys/types.h>
	#include <unistd.h>
	#include <fcntl.h>
	/* */
	#if defined(sun) \|\| defined(__sun__) \|\| \
	defined(__SUNPRO_C) \|\| defined(__SUNPRO_CC)
	# if defined(__SVR4) \|\| defined(__srv4__)
	# define PLATFORM_SOLARIS
	# else
	# define PLATFORM_SUNOS4
	# endif
	#endif
	#if (defined(_AIX) \|\| defined(__xlC__)) && !defined(_AIX41)
	# define PLATFORM_AIX_V3
	#endif
	/* */
	#if defined(PLATFORM_SUNOS4) \|\| defined(PLATFORM_AIX_V3) \|\| defined(__BEOS__)
	#error "O_NONBLOCK does not work on this platform"
	#endif

	int
	main ()
	{
	/* O_NONBLOCK source test */
	int flags = 0;
	if(0 != fcntl(0, F_SETFL, flags \| O_NONBLOCK))
	return 1;
	return 0;
	}
	#endif

	/* tests for gethostbyname_r */
	#if defined(HAVE_GETHOSTBYNAME_R_3_REENTRANT) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_5_REENTRANT) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_6_REENTRANT)
	# define _REENTRANT
	/* no idea whether _REENTRANT is always set, just invent a new flag */
	# define TEST_GETHOSTBYFOO_REENTRANT
	#endif
	#if defined(HAVE_GETHOSTBYNAME_R_3) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_5) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_6) \|\| \
	defined(TEST_GETHOSTBYFOO_REENTRANT)
	#include <sys/types.h>
	#include <netdb.h>
	int main(void)
	{
	char *address = "example.com";
	int length = 0;
	int type = 0;
	struct hostent h;
	int rc = 0;
	#if defined(HAVE_GETHOSTBYNAME_R_3) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_3_REENTRANT)
	struct hostent_data hdata;
	#elif defined(HAVE_GETHOSTBYNAME_R_5) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_5_REENTRANT) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_6) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_6_REENTRANT)
	char buffer[8192];
	int h_errnop;
	struct hostent *hp;
	#endif

	#if defined(HAVE_GETHOSTBYNAME_R_3) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_3_REENTRANT)
	rc = gethostbyname_r(address, &h, &hdata);
	#elif defined(HAVE_GETHOSTBYNAME_R_5) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_5_REENTRANT)
	rc = gethostbyname_r(address, &h, buffer, 8192, &h_errnop);
	(void)hp; /* not used for test */
	#elif defined(HAVE_GETHOSTBYNAME_R_6) \|\| \
	defined(HAVE_GETHOSTBYNAME_R_6_REENTRANT)
	rc = gethostbyname_r(address, &h, buffer, 8192, &hp, &h_errnop);
	#endif

	(void)length;
	(void)type;
	(void)rc;
	return 0;
	}
	#endif

	#ifdef HAVE_SOCKLEN_T
	#ifdef _WIN32
	#include <ws2tcpip.h>
	#else
	#include <sys/types.h>
	#include <sys/socket.h>
	#endif
	int
	main ()
	{
	if ((socklen_t *) 0)
	return 0;
	if (sizeof (socklen_t))
	return 0;
	;
	return 0;
	}
	#endif
	#ifdef HAVE_IN_ADDR_T
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <arpa/inet.h>

	int
	main ()
	{
	if ((in_addr_t *) 0)
	return 0;
	if (sizeof (in_addr_t))
	return 0;
	;
	return 0;
	}
	#endif

	#ifdef HAVE_BOOL_T
	#ifdef HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#ifdef HAVE_STDBOOL_H
	#include <stdbool.h>
	#endif
	int
	main ()
	{
	if (sizeof (bool *) )
	return 0;
	;
	return 0;
	}
	#endif

	#ifdef STDC_HEADERS
	#include <stdlib.h>
	#include <stdarg.h>
	#include <string.h>
	#include <float.h>
	int main() { return 0; }
	#endif
	#ifdef HAVE_GETADDRINFO
	#include <netdb.h>
	#include <sys/types.h>
	#include <sys/socket.h>

	int main(void) {
	struct addrinfo hints, *ai;
	int error;

	memset(&hints, 0, sizeof(hints));
	hints.ai_family = AF_UNSPEC;
	hints.ai_socktype = SOCK_STREAM;
	#ifndef getaddrinfo
	(void)getaddrinfo;
	#endif
	error = getaddrinfo("127.0.0.1", "8080", &hints, &ai);
	if (error) {
	return 1;
	}
	return 0;
	}
	#endif
	#ifdef HAVE_FILE_OFFSET_BITS
	#ifdef _FILE_OFFSET_BITS
	#undef _FILE_OFFSET_BITS
	#endif
	#define _FILE_OFFSET_BITS 64
	#include <sys/types.h>
	/* Check that off_t can represent 2**63 - 1 correctly.
	We can't simply define LARGE_OFF_T to be 9223372036854775807,
	since some C++ compilers masquerading as C compilers
	incorrectly reject 9223372036854775807. */
	#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
	int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
	&& LARGE_OFF_T % 2147483647 == 1)
	? 1 : -1];
	int main () { ; return 0; }
	#endif
	#ifdef HAVE_IOCTLSOCKET
	/* includes start */
	#ifdef HAVE_WINDOWS_H
	# ifndef WIN32_LEAN_AND_MEAN
	# define WIN32_LEAN_AND_MEAN
	# endif
	# include <windows.h>
	# ifdef HAVE_WINSOCK2_H
	# include <winsock2.h>
	# else
	# ifdef HAVE_WINSOCK_H
	# include <winsock.h>
	# endif
	# endif
	#endif

	int
	main ()
	{

	/* ioctlsocket source code */
	int socket;
	unsigned long flags = ioctlsocket(socket, FIONBIO, &flags);

	;
	return 0;
	}

	#endif
	#ifdef HAVE_IOCTLSOCKET_CAMEL
	/* includes start */
	#ifdef HAVE_WINDOWS_H
	# ifndef WIN32_LEAN_AND_MEAN
	# define WIN32_LEAN_AND_MEAN
	# endif
	# include <windows.h>
	# ifdef HAVE_WINSOCK2_H
	# include <winsock2.h>
	# else
	# ifdef HAVE_WINSOCK_H
	# include <winsock.h>
	# endif
	# endif
	#endif

	int
	main ()
	{

	/* IoctlSocket source code */
	if(0 != IoctlSocket(0, 0, 0))
	return 1;
	;
	return 0;
	}
	#endif
	#ifdef HAVE_IOCTLSOCKET_CAMEL_FIONBIO
	/* includes start */
	#ifdef HAVE_WINDOWS_H
	# ifndef WIN32_LEAN_AND_MEAN
	# define WIN32_LEAN_AND_MEAN
	# endif
	# include <windows.h>
	# ifdef HAVE_WINSOCK2_H
	# include <winsock2.h>
	# else
	# ifdef HAVE_WINSOCK_H
	# include <winsock.h>
	# endif
	# endif
	#endif

	int
	main ()
	{

	/* IoctlSocket source code */
	long flags = 0;
	if(0 != IoctlSocket(0, FIONBIO, &flags))
	return 1;
	;
	return 0;
	}
	#endif
	#ifdef HAVE_IOCTLSOCKET_FIONBIO
	/* includes start */
	#ifdef HAVE_WINDOWS_H
	# ifndef WIN32_LEAN_AND_MEAN
	# define WIN32_LEAN_AND_MEAN
	# endif
	# include <windows.h>
	# ifdef HAVE_WINSOCK2_H
	# include <winsock2.h>
	# else
	# ifdef HAVE_WINSOCK_H
	# include <winsock.h>
	# endif
	# endif
	#endif

	int
	main ()
	{

	int flags = 0;
	if(0 != ioctlsocket(0, FIONBIO, &flags))
	return 1;

	;
	return 0;
	}
	#endif
	#ifdef HAVE_IOCTL_FIONBIO
	/* headers for FIONBIO test */
	/* includes start */
	#ifdef HAVE_SYS_TYPES_H
	# include <sys/types.h>
	#endif
	#ifdef HAVE_UNISTD_H
	# include <unistd.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	# include <sys/socket.h>
	#endif
	#ifdef HAVE_SYS_IOCTL_H
	# include <sys/ioctl.h>
	#endif
	#ifdef HAVE_STROPTS_H
	# include <stropts.h>
	#endif

	int
	main ()
	{

	int flags = 0;
	if(0 != ioctl(0, FIONBIO, &flags))
	return 1;

	;
	return 0;
	}
	#endif
	#ifdef HAVE_IOCTL_SIOCGIFADDR
	/* headers for FIONBIO test */
	/* includes start */
	#ifdef HAVE_SYS_TYPES_H
	# include <sys/types.h>
	#endif
	#ifdef HAVE_UNISTD_H
	# include <unistd.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	# include <sys/socket.h>
	#endif
	#ifdef HAVE_SYS_IOCTL_H
	# include <sys/ioctl.h>
	#endif
	#ifdef HAVE_STROPTS_H
	# include <stropts.h>
	#endif
	#include <net/if.h>

	int
	main ()
	{
	struct ifreq ifr;
	if(0 != ioctl(0, SIOCGIFADDR, &ifr))
	return 1;

	;
	return 0;
	}
	#endif
	#ifdef HAVE_SETSOCKOPT_SO_NONBLOCK
	/* includes start */
	#ifdef HAVE_WINDOWS_H
	# ifndef WIN32_LEAN_AND_MEAN
	# define WIN32_LEAN_AND_MEAN
	# endif
	# include <windows.h>
	# ifdef HAVE_WINSOCK2_H
	# include <winsock2.h>
	# else
	# ifdef HAVE_WINSOCK_H
	# include <winsock.h>
	# endif
	# endif
	#endif
	/* includes start */
	#ifdef HAVE_SYS_TYPES_H
	# include <sys/types.h>
	#endif
	#ifdef HAVE_SYS_SOCKET_H
	# include <sys/socket.h>
	#endif
	/* includes end */

	int
	main ()
	{
	if(0 != setsockopt(0, SOL_SOCKET, SO_NONBLOCK, 0, 0))
	return 1;
	;
	return 0;
	}
	#endif
	#ifdef HAVE_GLIBC_STRERROR_R
	#include <string.h>
	#include <errno.h>

	void check(char c) {}

	int
	main () {
	char buffer[1024];
	/* This will not compile if strerror_r does not return a char* */
	check(strerror_r(EACCES, buffer, sizeof(buffer))[0]);
	return 0;
	}
	#endif
	#ifdef HAVE_POSIX_STRERROR_R
	#include <string.h>
	#include <errno.h>

	/* float, because a pointer can't be implicitly cast to float */
	void check(float f) {}

	int
	main () {
	char buffer[1024];
	/* This will not compile if strerror_r does not return an int */
	check(strerror_r(EACCES, buffer, sizeof(buffer)));
	return 0;
	}
	#endif
	#ifdef HAVE_FSETXATTR_6
	#include <sys/xattr.h> /* header from libc, not from libattr */
	int
	main() {
	fsetxattr(0, 0, 0, 0, 0, 0);
	return 0;
	}
	#endif
	#ifdef HAVE_FSETXATTR_5
	#include <sys/xattr.h> /* header from libc, not from libattr */
	int
	main() {
	fsetxattr(0, 0, 0, 0, 0);
	return 0;
	}
	#endif
	#ifdef HAVE_CLOCK_GETTIME_MONOTONIC
	#include <time.h>
	int
	main() {
	struct timespec ts = {0, 0};
	clock_gettime(CLOCK_MONOTONIC, &ts);
	return 0;
	}
	#endif
	#ifdef HAVE_BUILTIN_AVAILABLE
	int
	main() {
	if(__builtin_available(macOS 10.12, *)) {}
	return 0;
	}
	#endif
	#ifdef HAVE_VARIADIC_MACROS_C99
	#define c99_vmacro3(first, ...) fun3(first, __VA_ARGS__)
	#define c99_vmacro2(first, ...) fun2(first, __VA_ARGS__)

	int fun3(int arg1, int arg2, int arg3);
	int fun2(int arg1, int arg2);

	int fun3(int arg1, int arg2, int arg3) {
	return arg1 + arg2 + arg3;
	}
	int fun2(int arg1, int arg2) {
	return arg1 + arg2;
	}

	int
	main() {
	int res3 = c99_vmacro3(1, 2, 3);
	int res2 = c99_vmacro2(1, 2);
	(void)res3;
	(void)res2;
	return 0;
	}
	#endif
	#ifdef HAVE_VARIADIC_MACROS_GCC
	#define gcc_vmacro3(first, args...) fun3(first, args)
	#define gcc_vmacro2(first, args...) fun2(first, args)

	int fun3(int arg1, int arg2, int arg3);
	int fun2(int arg1, int arg2);

	int fun3(int arg1, int arg2, int arg3) {
	return arg1 + arg2 + arg3;
	}
	int fun2(int arg1, int arg2) {
	return arg1 + arg2;
	}

	int
	main() {
	int res3 = gcc_vmacro3(1, 2, 3);
	int res2 = gcc_vmacro2(1, 2);
	(void)res3;
	(void)res2;
	return 0;
	}
	#endif