The Tor Browser: ipc/chromium/src/third_party/libevent/configure.in@deefc01c0e14 (annotated)

ipc/chromium/src/third_party/libevent/configure.in@deefc01c0e14 (annotated)

ipc/chromium/src/third_party/libevent/configure.in

Thu, 15 Jan 2015 21:03:48 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 21:03:48 +0100
branch: TOR_BUG_9701
changeset 11: deefc01c0e14
permissions: -rw-r--r--

Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)

 dnl configure.in for libevent
 dnl Copyright 2000-2007 Niels Provos
 dnl Copyright 2007-2012 Niels Provos and Nick Mathewson
 dnl
 dnl See LICENSE for copying information.
 dnl
 dnl Original version Dug Song <dugsong@monkey.org>
 AC_PREREQ(2.59c)
 AC_INIT(event.c)
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE(libevent,2.0.21-stable)
 AM_CONFIG_HEADER(config.h)
 AC_DEFINE(NUMERIC_VERSION, 0x02001500, [Numeric representation of the version])
 dnl Initialize prefix.
 if test "$prefix" = "NONE"; then
    prefix="/usr/local"
 fi
 AC_CANONICAL_BUILD
 AC_CANONICAL_HOST
 dnl the 'build' machine is where we run configure and compile
 dnl the 'host' machine is where the resulting stuff runs.
 case "$host_os" in
  osf5*)
     CFLAGS="$CFLAGS -D_OSF_SOURCE"
     ;;
 esac
 dnl Checks for programs.
 AC_PROG_CC
 AM_PROG_CC_C_O
 AC_PROG_SED
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MKDIR_P
 AC_PROG_GCC_TRADITIONAL
 # We need to test for at least gcc 2.95 here, because older versions don't
 # have -fno-strict-aliasing
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
 #if !defined(__GNUC__) || (__GNUC__ < 2) || (__GNUC__ == 2 && __GNUC_MINOR__ < 95)
 #error
 #endif])], have_gcc295=yes, have_gcc295=no)
 if test "$GCC" = "yes" ; then
         # Enable many gcc warnings by default...
         CFLAGS="$CFLAGS -Wall"
 	# And disable the strict-aliasing optimization, since it breaks
 	# our sockaddr-handling code in strange ways.
 	if test x$have_gcc295 = xyes; then
 		CFLAGS="$CFLAGS -fno-strict-aliasing"
 	fi
 fi
 # OS X Lion started deprecating the system openssl. Let's just disable
 # all deprecation warnings on OS X.
 case "$host_os" in
  darwin*)
     CFLAGS="$CFLAGS -Wno-deprecated-declarations"
     ;;
 esac
 AC_ARG_ENABLE(gcc-warnings,
      AS_HELP_STRING(--enable-gcc-warnings, enable verbose warnings with GCC))
 AC_ARG_ENABLE(thread-support,
      AS_HELP_STRING(--disable-thread-support, disable support for threading),
 	[], [enable_thread_support=yes])
 AC_ARG_ENABLE(malloc-replacement,
      AS_HELP_STRING(--disable-malloc-replacement, disable support for replacing the memory mgt functions),
         [], [enable_malloc_replacement=yes])
 AC_ARG_ENABLE(openssl,
      AS_HELP_STRING(--disable-openssl, disable support for openssl encryption),
         [], [enable_openssl=yes])
 AC_ARG_ENABLE(debug-mode,
      AS_HELP_STRING(--disable-debug-mode, disable support for running in debug mode),
         [], [enable_debug_mode=yes])
 AC_ARG_ENABLE([libevent-install],
      AS_HELP_STRING([--disable-libevent-install, disable installation of libevent]),
 	[], [enable_libevent_install=yes])
 AC_ARG_ENABLE([libevent-regress],
      AS_HELP_STRING([--disable-libevent-regress, skip regress in make check]),
 	[], [enable_libevent_regress=yes])
 AC_ARG_ENABLE([function-sections],
      AS_HELP_STRING([--enable-function-sections, make static library allow smaller binaries with --gc-sections]),
 	[], [enable_function_sections=no])
 AC_PROG_LIBTOOL
 dnl   Uncomment "AC_DISABLE_SHARED" to make shared librraries not get
 dnl   built by default.  You can also turn shared libs on and off from
 dnl   the command line with --enable-shared and --disable-shared.
 dnl AC_DISABLE_SHARED
 AC_SUBST(LIBTOOL_DEPS)
 AM_CONDITIONAL([BUILD_REGRESS], [test "$enable_libevent_regress" = "yes"])
 dnl Checks for libraries.
 AC_SEARCH_LIBS([inet_ntoa], [nsl])
 AC_SEARCH_LIBS([socket], [socket])
 AC_SEARCH_LIBS([inet_aton], [resolv])
 AC_SEARCH_LIBS([clock_gettime], [rt])
 AC_SEARCH_LIBS([sendfile], [sendfile])
 dnl - check if the macro WIN32 is defined on this compiler.
 dnl - (this is how we check for a windows version of GCC)
 AC_MSG_CHECKING(for WIN32)
 AC_TRY_COMPILE(,
 	[
 #ifndef WIN32
 die horribly
 #endif
 	],
 	bwin32=true; AC_MSG_RESULT(yes),
 	bwin32=false; AC_MSG_RESULT(no),
 )
 dnl - check if the macro __CYGWIN__ is defined on this compiler.
 dnl - (this is how we check for a cygwin version of GCC)
 AC_MSG_CHECKING(for CYGWIN)
 AC_TRY_COMPILE(,
 	[
 #ifndef __CYGWIN__
 die horribly
 #endif
 	],
 	cygwin=true; AC_MSG_RESULT(yes),
 	cygwin=false; AC_MSG_RESULT(no),
 )
 AC_CHECK_HEADERS([zlib.h])
 if test "x$ac_cv_header_zlib_h" = "xyes"; then
 dnl Determine if we have zlib for regression tests
 dnl Don't put this one in LIBS
 save_LIBS="$LIBS"
 LIBS=""
 ZLIB_LIBS=""
 have_zlib=no
 AC_SEARCH_LIBS([inflateEnd], [z],
 	[have_zlib=yes
 	ZLIB_LIBS="$LIBS"
 	AC_DEFINE(HAVE_LIBZ, 1, [Define if the system has zlib])])
 LIBS="$save_LIBS"
 AC_SUBST(ZLIB_LIBS)
 fi
 AM_CONDITIONAL(ZLIB_REGRESS, [test "$have_zlib" = "yes"])
 dnl See if we have openssl.  This doesn't go in LIBS either.
 if test "$bwin32" = true; then
   EV_LIB_WS32=-lws2_32
   EV_LIB_GDI=-lgdi32
 else
   EV_LIB_WS32=
   EV_LIB_GDI=
 fi
 AC_SUBST(EV_LIB_WS32)
 AC_SUBST(EV_LIB_GDI)
 AC_SUBST(OPENSSL_LIBADD)
 AC_CHECK_HEADERS([openssl/bio.h])
 if test "$enable_openssl" = "yes"; then
 save_LIBS="$LIBS"
 LIBS=""
 OPENSSL_LIBS=""
 have_openssl=no
 AC_SEARCH_LIBS([SSL_new], [ssl],
 	[have_openssl=yes
 	OPENSSL_LIBS="$LIBS -lcrypto $EV_LIB_GDI $EV_LIB_WS32 $OPENSSL_LIBADD"
 	AC_DEFINE(HAVE_OPENSSL, 1, [Define if the system has openssl])],
 	[have_openssl=no],
 	[-lcrypto $EV_LIB_GDI $EV_LIB_WS32 $OPENSSL_LIBADD])
 LIBS="$save_LIBS"
 AC_SUBST(OPENSSL_LIBS)
 fi
 dnl Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([fcntl.h stdarg.h inttypes.h stdint.h stddef.h poll.h unistd.h sys/epoll.h sys/time.h sys/queue.h sys/event.h sys/param.h sys/ioctl.h sys/select.h sys/devpoll.h port.h netinet/in.h netinet/in6.h sys/socket.h sys/uio.h arpa/inet.h sys/eventfd.h sys/mman.h sys/sendfile.h sys/wait.h netdb.h])
 AC_CHECK_HEADERS([sys/stat.h])
 AC_CHECK_HEADERS(sys/sysctl.h, [], [], [
 #ifdef HAVE_SYS_PARAM_H
 #include <sys/param.h>
 #endif
 ])
 if test "x$ac_cv_header_sys_queue_h" = "xyes"; then
 	AC_MSG_CHECKING(for TAILQ_FOREACH in sys/queue.h)
 	AC_EGREP_CPP(yes,
 [
 #include <sys/queue.h>
 #ifdef TAILQ_FOREACH
  yes
 #endif
 ],	[AC_MSG_RESULT(yes)
 	 AC_DEFINE(HAVE_TAILQFOREACH, 1,
 		[Define if TAILQ_FOREACH is defined in <sys/queue.h>])],
 	AC_MSG_RESULT(no)
 	)
 fi
 if test "x$ac_cv_header_sys_time_h" = "xyes"; then
 	AC_MSG_CHECKING(for timeradd in sys/time.h)
 	AC_EGREP_CPP(yes,
 [
 #include <sys/time.h>
 #ifdef timeradd
  yes
 #endif
 ],	[ AC_DEFINE(HAVE_TIMERADD, 1,
 		[Define if timeradd is defined in <sys/time.h>])
 	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
 )
 fi
 if test "x$ac_cv_header_sys_time_h" = "xyes"; then
 	AC_MSG_CHECKING(for timercmp in sys/time.h)
 	AC_EGREP_CPP(yes,
 [
 #include <sys/time.h>
 #ifdef timercmp
  yes
 #endif
 ],	[ AC_DEFINE(HAVE_TIMERCMP, 1,
 		[Define if timercmp is defined in <sys/time.h>])
 	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
 )
 fi
 if test "x$ac_cv_header_sys_time_h" = "xyes"; then
 	AC_MSG_CHECKING(for timerclear in sys/time.h)
 	AC_EGREP_CPP(yes,
 [
 #include <sys/time.h>
 #ifdef timerclear
  yes
 #endif
 ],	[ AC_DEFINE(HAVE_TIMERCLEAR, 1,
 		[Define if timerclear is defined in <sys/time.h>])
 	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
 )
 fi
 if test "x$ac_cv_header_sys_time_h" = "xyes"; then
 	AC_MSG_CHECKING(for timerisset in sys/time.h)
 	AC_EGREP_CPP(yes,
 [
 #include <sys/time.h>
 #ifdef timerisset
  yes
 #endif
 ],	[ AC_DEFINE(HAVE_TIMERISSET, 1,
 		[Define if timerisset is defined in <sys/time.h>])
 	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
 )
 fi
 if test "x$ac_cv_header_sys_sysctl_h" = "xyes"; then
 	AC_CHECK_DECLS([CTL_KERN, KERN_RANDOM, RANDOM_UUID, KERN_ARND], [], [],
 	   [[#include <sys/types.h>
 	     #include <sys/sysctl.h>]]
 	)
 fi
 AM_CONDITIONAL(BUILD_WIN32, test x$bwin32 = xtrue)
 AM_CONDITIONAL(BUILD_CYGWIN, test x$cygwin = xtrue)
 AM_CONDITIONAL(BUILD_WITH_NO_UNDEFINED, test x$bwin32 = xtrue || test x$cygwin = xtrue)
 if test x$bwin32 = xtrue; then
    AC_SEARCH_LIBS([getservbyname],[ws2_32])
 fi
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_C_INLINE
 AC_HEADER_TIME
 dnl Checks for library functions.
 AC_CHECK_FUNCS([gettimeofday vasprintf fcntl clock_gettime strtok_r strsep])
 AC_CHECK_FUNCS([getnameinfo strlcpy inet_ntop inet_pton signal sigaction strtoll inet_aton pipe eventfd sendfile mmap splice arc4random arc4random_buf issetugid geteuid getegid getprotobynumber setenv unsetenv putenv sysctl])
 AC_CHECK_FUNCS([umask])
 AC_CACHE_CHECK(
     [for getaddrinfo],
     [libevent_cv_getaddrinfo],
     [AC_LINK_IFELSE(
 	[AC_LANG_PROGRAM(
 	    [[
 		#ifdef HAVE_NETDB_H
 		#include <netdb.h>
 		#endif
 	    ]],
 	    [[
 		getaddrinfo;
 	    ]]
 	)],
 	[libevent_cv_getaddrinfo=yes],
 	[libevent_cv_getaddrinfo=no]
     )]
 )
 if test "$libevent_cv_getaddrinfo" = "yes" ; then
     AC_DEFINE([HAVE_GETADDRINFO], [1], [Do we have getaddrinfo()?])
 else
 AC_CHECK_FUNCS([getservbyname])
 # Check for gethostbyname_r in all its glorious incompatible versions.
 #   (This is cut-and-pasted from Tor, which based its logic on
 #   Python's configure.in.)
 AH_TEMPLATE(HAVE_GETHOSTBYNAME_R,
   [Define this if you have any gethostbyname_r()])
 AC_CHECK_FUNC(gethostbyname_r, [
   AC_MSG_CHECKING([how many arguments gethostbyname_r() wants])
   OLD_CFLAGS=$CFLAGS
   CFLAGS="$CFLAGS $MY_CPPFLAGS $MY_THREAD_CPPFLAGS $MY_CFLAGS"
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
 #include <netdb.h>
   ], [[
     char *cp1, *cp2;
     struct hostent *h1, *h2;
     int i1, i2;
     (void)gethostbyname_r(cp1,h1,cp2,i1,&h2,&i2);
   ]])],[
     AC_DEFINE(HAVE_GETHOSTBYNAME_R)
     AC_DEFINE(HAVE_GETHOSTBYNAME_R_6_ARG, 1,
      [Define this if gethostbyname_r takes 6 arguments])
     AC_MSG_RESULT(6)
   ], [
     AC_TRY_COMPILE([
 #include <netdb.h>
     ], [
       char *cp1, *cp2;
       struct hostent *h1;
       int i1, i2;
       (void)gethostbyname_r(cp1,h1,cp2,i1,&i2);
     ], [
       AC_DEFINE(HAVE_GETHOSTBYNAME_R)
       AC_DEFINE(HAVE_GETHOSTBYNAME_R_5_ARG, 1,
         [Define this if gethostbyname_r takes 5 arguments])
       AC_MSG_RESULT(5)
    ], [
       AC_TRY_COMPILE([
 #include <netdb.h>
      ], [
        char *cp1;
        struct hostent *h1;
        struct hostent_data hd;
        (void) gethostbyname_r(cp1,h1,&hd);
      ], [
        AC_DEFINE(HAVE_GETHOSTBYNAME_R)
        AC_DEFINE(HAVE_GETHOSTBYNAME_R_3_ARG, 1,
          [Define this if gethostbyname_r takes 3 arguments])
        AC_MSG_RESULT(3)
      ], [
        AC_MSG_RESULT(0)
      ])
   ])
  ])
  CFLAGS=$OLD_CFLAGS
 ])
 fi
 AC_CHECK_SIZEOF(long)
 AC_MSG_CHECKING(for F_SETFD in fcntl.h)
 AC_EGREP_CPP(yes,
 [
 #define _GNU_SOURCE
 #include <fcntl.h>
 #ifdef F_SETFD
 yes
 #endif
 ],	[ AC_DEFINE(HAVE_SETFD, 1,
 	      [Define if F_SETFD is defined in <fcntl.h>])
 	  AC_MSG_RESULT(yes) ], AC_MSG_RESULT(no))
 needsignal=no
 haveselect=no
 if test x$bwin32 != xtrue; then
     AC_CHECK_FUNCS(select, [haveselect=yes], )
     if test "x$haveselect" = "xyes" ; then
  	needsignal=yes
     fi
 fi
 AM_CONDITIONAL(SELECT_BACKEND, [test "x$haveselect" = "xyes"])
 havepoll=no
 AC_CHECK_FUNCS(poll, [havepoll=yes], )
 if test "x$havepoll" = "xyes" ; then
 	needsignal=yes
 fi
 AM_CONDITIONAL(POLL_BACKEND, [test "x$havepoll" = "xyes"])
 havedevpoll=no
 if test "x$ac_cv_header_sys_devpoll_h" = "xyes"; then
 	AC_DEFINE(HAVE_DEVPOLL, 1,
 		    [Define if /dev/poll is available])
 fi
 AM_CONDITIONAL(DEVPOLL_BACKEND, [test "x$ac_cv_header_sys_devpoll_h" = "xyes"])
 havekqueue=no
 if test "x$ac_cv_header_sys_event_h" = "xyes"; then
 	AC_CHECK_FUNCS(kqueue, [havekqueue=yes], )
 	if test "x$havekqueue" = "xyes" ; then
 		AC_MSG_CHECKING(for working kqueue)
 		AC_TRY_RUN(
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/event.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>
 int
 main(int argc, char **argv)
 {
 	int kq;
 	int n;
 	int fd[[2]];
 	struct kevent ev;
 	struct timespec ts;
 	char buf[[8000]];
 	if (pipe(fd) == -1)
 		exit(1);
 	if (fcntl(fd[[1]], F_SETFL, O_NONBLOCK) == -1)
 		exit(1);
 	while ((n = write(fd[[1]], buf, sizeof(buf))) == sizeof(buf))
 		;
         if ((kq = kqueue()) == -1)
 		exit(1);
 	memset(&ev, 0, sizeof(ev));
 	ev.ident = fd[[1]];
 	ev.filter = EVFILT_WRITE;
 	ev.flags = EV_ADD | EV_ENABLE;
 	n = kevent(kq, &ev, 1, NULL, 0, NULL);
 	if (n == -1)
 		exit(1);
 	read(fd[[0]], buf, sizeof(buf));
 	ts.tv_sec = 0;
 	ts.tv_nsec = 0;
 	n = kevent(kq, NULL, 0, &ev, 1, &ts);
 	if (n == -1 || n == 0)
 		exit(1);
 	exit(0);
 }, [AC_MSG_RESULT(yes)
     AC_DEFINE(HAVE_WORKING_KQUEUE, 1,
 		[Define if kqueue works correctly with pipes])
     havekqueue=yes
     ], AC_MSG_RESULT(no), AC_MSG_RESULT(no))
 	fi
 fi
 AM_CONDITIONAL(KQUEUE_BACKEND, [test "x$havekqueue" = "xyes"])
 haveepollsyscall=no
 haveepoll=no
 AC_CHECK_FUNCS(epoll_ctl, [haveepoll=yes], )
 if test "x$haveepoll" = "xyes" ; then
 	AC_DEFINE(HAVE_EPOLL, 1,
 		[Define if your system supports the epoll system calls])
 	needsignal=yes
 fi
 if test "x$ac_cv_header_sys_epoll_h" = "xyes"; then
 	if test "x$haveepoll" = "xno" ; then
 		AC_MSG_CHECKING(for epoll system call)
 		AC_TRY_RUN(
 #include <stdint.h>
 #include <sys/param.h>
 #include <sys/types.h>
 #include <sys/syscall.h>
 #include <sys/epoll.h>
 #include <unistd.h>
 int
 epoll_create(int size)
 {
 	return (syscall(__NR_epoll_create, size));
 }
 int
 main(int argc, char **argv)
 {
 	int epfd;
 	epfd = epoll_create(256);
 	exit (epfd == -1 ? 1 : 0);
 }, [AC_MSG_RESULT(yes)
     AC_DEFINE(HAVE_EPOLL, 1,
 	[Define if your system supports the epoll system calls])
     needsignal=yes
     have_epoll=yes
     AC_LIBOBJ(epoll_sub)
     ], AC_MSG_RESULT(no), AC_MSG_RESULT(no))
 	fi
 fi
 AM_CONDITIONAL(EPOLL_BACKEND, [test "x$haveepoll" = "xyes"])
 haveeventports=no
 AC_CHECK_FUNCS(port_create, [haveeventports=yes], )
 if test "x$haveeventports" = "xyes" ; then
 	AC_DEFINE(HAVE_EVENT_PORTS, 1,
 		[Define if your system supports event ports])
 	needsignal=yes
 fi
 AM_CONDITIONAL(EVPORT_BACKEND, [test "x$haveeventports" = "xyes"])
 if test "x$bwin32" = "xtrue"; then
 	needsignal=yes
 fi
 AM_CONDITIONAL(SIGNAL_SUPPORT, [test "x$needsignal" = "xyes"])
 AC_TYPE_PID_T
 AC_TYPE_SIZE_T
 AC_TYPE_SSIZE_T
 AC_CHECK_TYPES([uint64_t, uint32_t, uint16_t, uint8_t, uintptr_t], , ,
 [#ifdef HAVE_STDINT_H
 #include <stdint.h>
 #elif defined(HAVE_INTTYPES_H)
 #include <inttypes.h>
 #endif
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif])
 AC_CHECK_TYPES([fd_mask], , ,
 [#ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>
 #endif])
 AC_CHECK_SIZEOF(long long)
 AC_CHECK_SIZEOF(long)
 AC_CHECK_SIZEOF(int)
 AC_CHECK_SIZEOF(short)
 AC_CHECK_SIZEOF(size_t)
 AC_CHECK_SIZEOF(void *)
 AC_CHECK_TYPES([struct in6_addr, struct sockaddr_in6, sa_family_t, struct addrinfo, struct sockaddr_storage], , ,
 [#define _GNU_SOURCE
 #include <sys/types.h>
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 #ifdef HAVE_NETINET_IN6_H
 #include <netinet/in6.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #ifdef HAVE_NETDB_H
 #include <netdb.h>
 #endif
 #ifdef WIN32
 #define WIN32_WINNT 0x400
 #define _WIN32_WINNT 0x400
 #define WIN32_LEAN_AND_MEAN
 #if defined(_MSC_VER) && (_MSC_VER < 1300)
 #include <winsock.h>
 #else
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #endif
 #endif
 ])
 AC_CHECK_MEMBERS([struct in6_addr.s6_addr32, struct in6_addr.s6_addr16, struct sockaddr_in.sin_len, struct sockaddr_in6.sin6_len, struct sockaddr_storage.ss_family, struct sockaddr_storage.__ss_family], , ,
 [#include <sys/types.h>
 #ifdef HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 #ifdef HAVE_NETINET_IN6_H
 #include <netinet/in6.h>
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
 #endif
 #ifdef WIN32
 #define WIN32_WINNT 0x400
 #define _WIN32_WINNT 0x400
 #define WIN32_LEAN_AND_MEAN
 #if defined(_MSC_VER) && (_MSC_VER < 1300)
 #include <winsock.h>
 #else
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #endif
 #endif
 ])
 AC_MSG_CHECKING([for socklen_t])
 AC_TRY_COMPILE([
  #include <sys/types.h>
  #include <sys/socket.h>],
   [socklen_t x;],
   AC_MSG_RESULT([yes]),
   [AC_MSG_RESULT([no])
   AC_DEFINE(socklen_t, unsigned int,
 	[Define to unsigned int if you dont have it])]
 )
 AC_MSG_CHECKING([whether our compiler supports __func__])
 AC_TRY_COMPILE([],
  [ const char *cp = __func__; ],
  AC_MSG_RESULT([yes]),
  AC_MSG_RESULT([no])
  AC_MSG_CHECKING([whether our compiler supports __FUNCTION__])
  AC_TRY_COMPILE([],
    [ const char *cp = __FUNCTION__; ],
    AC_MSG_RESULT([yes])
    AC_DEFINE(__func__, __FUNCTION__,
          [Define to appropriate substitue if compiler doesnt have __func__]),
    AC_MSG_RESULT([no])
    AC_DEFINE(__func__, __FILE__,
          [Define to appropriate substitue if compiler doesnt have __func__])))
 # check if we can compile with pthreads
 have_pthreads=no
 if test x$bwin32 != xtrue && test "$enable_thread_support" != "no"; then
   ACX_PTHREAD([
 	AC_DEFINE(HAVE_PTHREADS, 1,
 		[Define if we have pthreads on this system])
 	have_pthreads=yes])
   CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
   AC_CHECK_SIZEOF(pthread_t, ,
      [AC_INCLUDES_DEFAULT()
       #include <pthread.h> ]
   )
 fi
 AM_CONDITIONAL(PTHREADS, [test "$have_pthreads" != "no" && test "$enable_thread_support" != "no"])
 # check if we should compile locking into the library
 if test x$enable_thread_support = xno; then
    AC_DEFINE(DISABLE_THREAD_SUPPORT, 1,
 	[Define if libevent should not be compiled with thread support])
 fi
 # check if we should hard-code the mm functions.
 if test x$enable_malloc_replacement = xno; then
   AC_DEFINE(DISABLE_MM_REPLACEMENT, 1,
         [Define if libevent should not allow replacing the mm functions])
 fi
 # check if we should hard-code debugging out
 if test x$enable_debug_mode = xno; then
   AC_DEFINE(DISABLE_DEBUG_MODE, 1,
         [Define if libevent should build without support for a debug mode])
 fi
 # check if we have and should use openssl
 AM_CONDITIONAL(OPENSSL, [test "$enable_openssl" != "no" && test "$have_openssl" = "yes"])
 # Add some more warnings which we use in development but not in the
 # released versions.  (Some relevant gcc versions can't handle these.)
 if test x$enable_gcc_warnings = xyes && test "$GCC" = "yes"; then
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
 #if !defined(__GNUC__) || (__GNUC__ < 4)
 #error
 #endif])], have_gcc4=yes, have_gcc4=no)
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
 #if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 2)
 #error
 #endif])], have_gcc42=yes, have_gcc42=no)
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
 #if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 5)
 #error
 #endif])], have_gcc45=yes, have_gcc45=no)
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
 #if !defined(__clang__)
 #error
 #endif])], have_clang=yes, have_clang=no)
   CFLAGS="$CFLAGS -W -Wfloat-equal -Wundef -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings -Wredundant-decls -Wchar-subscripts -Wcomment -Wformat -Wwrite-strings -Wmissing-declarations -Wredundant-decls -Wnested-externs -Wbad-function-cast -Wswitch-enum -Werror"
   CFLAGS="$CFLAGS -Wno-unused-parameter -Wstrict-aliasing"
   if test x$have_gcc4 = xyes ; then
     # These warnings break gcc 3.3.5 and work on gcc 4.0.2
     CFLAGS="$CFLAGS -Winit-self -Wmissing-field-initializers -Wdeclaration-after-statement"
     #CFLAGS="$CFLAGS -Wold-style-definition"
   fi
   if test x$have_gcc42 = xyes ; then
     # These warnings break gcc 4.0.2 and work on gcc 4.2
     CFLAGS="$CFLAGS -Waddress"
   fi
   if test x$have_gcc42 = xyes && test x$have_clang = xno; then
     # These warnings break gcc 4.0.2 and clang, but work on gcc 4.2
     CFLAGS="$CFLAGS -Wnormalized=id -Woverride-init"
   fi
   if test x$have_gcc45 = xyes ; then
     # These warnings work on gcc 4.5
     CFLAGS="$CFLAGS -Wlogical-op"
   fi
   if test x$have_clang = xyes; then
     # Disable the unused-function warnings, because these trigger
     # for minheap-internal.h related code.
     CFLAGS="$CFLAGS -Wno-unused-function"
   fi
 ##This will break the world on some 64-bit architectures
 # CFLAGS="$CFLAGS -Winline"
 fi
 LIBEVENT_GC_SECTIONS=
 if test "$GCC" = yes && test "$enable_function_sections" = yes ; then
     AC_CACHE_CHECK(
 	[if linker supports omitting unused code and data],
 	[libevent_cv_gc_sections_runs],
 	[
 	    dnl  NetBSD will link but likely not run with --gc-sections
 	    dnl  http://bugs.ntp.org/1844
 	    dnl  http://gnats.netbsd.org/40401
 	    dnl  --gc-sections causes attempt to load as linux elf, with
 	    dnl  wrong syscalls in place.  Test a little gauntlet of
 	    dnl  simple stdio read code checking for errors, expecting
 	    dnl  enough syscall differences that the NetBSD code will
 	    dnl  fail even with Linux emulation working as designed.
 	    dnl  A shorter test could be refined by someone with access
 	    dnl  to a NetBSD host with Linux emulation working.
 	    origCFLAGS="$CFLAGS"
 	    CFLAGS="$CFLAGS -Wl,--gc-sections"
 	    AC_LINK_IFELSE(
 		[AC_LANG_PROGRAM(
 		    [[
 			#include <stdlib.h>
 			#include <stdio.h>
 		    ]],
 		    [[
 			FILE *	fpC;
 			char	buf[32];
 			size_t	cch;
 			int	read_success_once;
 			fpC = fopen("conftest.c", "r");
 			if (NULL == fpC)
 				exit(1);
 			do {
 				cch = fread(buf, sizeof(buf), 1, fpC);
 				read_success_once |= (0 != cch);
 			} while (0 != cch);
 			if (!read_success_once)
 				exit(2);
 			if (!feof(fpC))
 				exit(3);
 			if (0 != fclose(fpC))
 				exit(4);
 			exit(EXIT_SUCCESS);
 		    ]]
 		)],
 		[
                     dnl We have to do this invocation manually so that we can
                     dnl get the output of conftest.err to make sure it doesn't
                     dnl mention gc-sections.
 		    if test "X$cross_compiling" = "Xyes" || grep gc-sections conftest.err ; then
 			libevent_cv_gc_sections_runs=no
 		    else
 			libevent_cv_gc_sections_runs=no
 			./conftest >/dev/null 2>&1 && libevent_cv_gc_sections_runs=yes
 		    fi
 		],
 		[libevent_cv_gc_sections_runs=no]
 	    )
 	    CFLAGS="$origCFLAGS"
 	    AS_UNSET([origCFLAGS])
 	]
     )
     case "$libevent_cv_gc_sections_runs" in
      yes)
 	CFLAGS="-ffunction-sections -fdata-sections $CFLAGS"
 	LIBEVENT_GC_SECTIONS="-Wl,--gc-sections"
 	;;
     esac
 fi
 AC_SUBST([LIBEVENT_GC_SECTIONS])
 AM_CONDITIONAL([INSTALL_LIBEVENT], [test "$enable_libevent_install" = "yes"])
 AC_CONFIG_FILES( [libevent.pc libevent_openssl.pc libevent_pthreads.pc] )
 AC_OUTPUT(Makefile include/Makefile test/Makefile sample/Makefile)

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ipc/chromium/src/third_party/libevent/configure.in@deefc01c0e14 (annotated)

ipc/chromium/src/third_party/libevent/configure.in