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 AC_PREREQ([2.67]) AC_INIT(libevent,2.2.0-alpha-dev) AC_CONFIG_SRCDIR(event.c) AC_CONFIG_MACRO_DIR([m4]) AC_CONFIG_AUX_DIR([build-aux]) dnl Automake setup dnl 'foreign' means that GNU package rules are not strictly enforced. AM_INIT_AUTOMAKE([1.13 foreign subdir-objects]) dnl make compilation quiet unless V=1 is used AM_SILENT_RULES([yes]) AC_CONFIG_HEADERS(config.h evconfig-private.h:evconfig-private.h.in) AC_DEFINE(NUMERIC_VERSION, 0x02020001, [Numeric representation of the version]) dnl Try and get a full POSIX environment on obscure systems AC_USE_SYSTEM_EXTENSIONS dnl the 'build' machine is where we run configure and compile dnl the 'host' machine is where the resulting stuff runs. AC_CANONICAL_BUILD AC_CANONICAL_HOST dnl Checks for programs. AM_PROG_CC_C_O AC_PROG_INSTALL AC_PROG_LN_S AC_PROG_SED AC_ARG_ENABLE([gcc-warnings], AS_HELP_STRING([--disable-gcc-warnings, disable verbose warnings with GCC])) AC_ARG_ENABLE([gcc-hardening], AS_HELP_STRING([--enable-gcc-hardening, enable compiler security checks]), [if test "$enableval" = "yes"; then CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=3 -fstack-protector-all" CFLAGS="$CFLAGS -fwrapv -fPIE -Wstack-protector" CFLAGS="$CFLAGS --param ssp-buffer-size=1" fi]) 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([mbedtls], AS_HELP_STRING([--disable-mbedtls, disable support for mbedtls encryption]), [], [enable_mbedtls=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([samples], AS_HELP_STRING([--disable-samples, skip building of sample programs]), [], [enable_samples=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_ARG_ENABLE([verbose-debug], AS_HELP_STRING([--enable-verbose-debug, verbose debug logging]), [], [enable_verbose_debug=no]) AC_ARG_ENABLE([clock-gettime], AS_HELP_STRING([--disable-clock-gettime, do not use clock_gettime even if it is available]), [], [enable_clock_gettime=yes]) LT_PREREQ([2.4.2]) LT_INIT AC_SUBST(LIBTOOL_DEPS) AM_CONDITIONAL([BUILD_SAMPLES], [test "$enable_samples" = "yes"]) AM_CONDITIONAL([BUILD_REGRESS], [test "$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]) if test "$enable_clock_gettime" = "yes"; then AC_SEARCH_LIBS([clock_gettime], [rt]) AC_CHECK_FUNCS([clock_gettime]) fi AC_SEARCH_LIBS([sendfile], [sendfile]) dnl - check if the macro _WIN32 is defined on this compiler. dnl - (this is how we check for a windows compiler) AC_MSG_CHECKING(for WIN32) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([], [ #ifndef _WIN32 die horribly #endif ] )], [bwin32=true; AC_MSG_RESULT(yes)], [bwin32=false; AC_MSG_RESULT(no)] ) dnl - check if the macro __midipix__ is defined on this compiler. dnl - (this is how we check for a midipix version of GCC) AC_MSG_CHECKING(for MIDIPIX) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([], [ #ifndef __midipix__ die horribly #endif ] )], [midipix=true; AC_MSG_RESULT(yes)], [midipix=false; AC_MSG_RESULT(no)] ) dnl - check if the macro __CYGWIN__ is defined on this compiler. dnl - (this is how we check for a cygwin version of GCC) AC_MSG_CHECKING(for CYGWIN) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([], [ #ifndef __CYGWIN__ die horribly #endif ] )], [cygwin=true; AC_MSG_RESULT(yes)], [cygwin=false; AC_MSG_RESULT(no)] ) AC_CHECK_HEADERS([zlib.h]) if test "$ac_cv_header_zlib_h" = "yes"; 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 "$bwin32" = "true"; then EV_LIB_WS32=-lws2_32 EV_LIB_GDI=-lgdi32 else EV_LIB_WS32= EV_LIB_GDI= fi AC_SUBST(EV_LIB_WS32) AC_SUBST(EV_LIB_GDI) AC_SUBST(OPENSSL_LIBADD) AC_SYS_LARGEFILE LIBEVENT_OPENSSL LIBEVENT_MBEDTLS dnl Checks for header files. AC_CHECK_HEADERS([arpa/inet.h fcntl.h ifaddrs.h mach/mach_time.h mach/mach.h netdb.h netinet/in.h netinet/in6.h netinet/tcp.h sys/un.h poll.h port.h stdarg.h stddef.h sys/devpoll.h sys/epoll.h sys/event.h sys/eventfd.h sys/ioctl.h sys/mman.h sys/param.h sys/queue.h sys/resource.h sys/select.h sys/sendfile.h sys/socket.h sys/stat.h sys/time.h sys/timerfd.h sys/signalfd.h sys/uio.h sys/wait.h sys/random.h errno.h afunix.h]) case "${host_os}" in linux*) ;; *) AC_CHECK_HEADERS(sys/sysctl.h, [], [], [ #ifdef HAVE_SYS_PARAM_H #include #endif ]) esac if test "$ac_cv_header_sys_queue_h" = "yes"; then AC_MSG_CHECKING(for TAILQ_FOREACH in sys/queue.h) AC_EGREP_CPP(yes, [ #include #ifdef TAILQ_FOREACH yes #endif ], [AC_MSG_RESULT(yes) AC_DEFINE(HAVE_TAILQFOREACH, 1, [Define if TAILQ_FOREACH is defined in ])], AC_MSG_RESULT(no) ) fi dnl if we have sys/time.h, check for timer* macros if test "$ac_cv_header_sys_time_h" = "yes"; then AC_MSG_CHECKING(for timeradd in sys/time.h) AC_EGREP_CPP(yes, [ #include #ifdef timeradd yes #endif], [AC_MSG_RESULT(yes); AC_DEFINE(HAVE_TIMERADD, 1, [Define if timeradd is defined in ])], [AC_MSG_RESULT(no)] ) AC_MSG_CHECKING(for timercmp in sys/time.h) AC_EGREP_CPP(yes, [ #include #ifdef timercmp yes #endif], [AC_MSG_RESULT(yes); AC_DEFINE(HAVE_TIMERCMP, 1,[Define if timercmp is defined in ])], [AC_MSG_RESULT(no)] ) AC_MSG_CHECKING(for timerclear in sys/time.h) AC_EGREP_CPP(yes, [ #include #ifdef timerclear yes #endif], [AC_MSG_RESULT(yes); AC_DEFINE(HAVE_TIMERCLEAR, 1, [Define if timerclear is defined in ])], [AC_MSG_RESULT(no)] ) AC_MSG_CHECKING(for timerisset in sys/time.h) AC_EGREP_CPP(yes, [ #include #ifdef timerisset yes #endif], [AC_MSG_RESULT(yes); AC_DEFINE(HAVE_TIMERISSET, 1, [Define if timerisset is defined in ])], [AC_MSG_RESULT(no)] ) fi if test "$ac_cv_header_sys_sysctl_h" = "yes"; then AC_CHECK_DECLS([CTL_KERN, KERN_ARND], [], [], [[#include #include ]] ) fi AM_CONDITIONAL(BUILD_WIN32, test "$bwin32" = "true") AM_CONDITIONAL(BUILD_CYGWIN, test "$cygwin" = "true") AM_CONDITIONAL(BUILD_MIDIPIX, test "$midipix" = "true") AM_CONDITIONAL(BUILD_WITH_NO_UNDEFINED, test x$bwin32 = xtrue || test x$cygwin = xtrue || test x$midipix = xtrue) if test "$bwin32" = "true"; then AC_CHECK_LIB([ws2_32], [main]) fi dnl Checks for typedefs, structures, and compiler characteristics. AC_C_INLINE dnl Checks for library functions. AC_CHECK_FUNCS([accept4 arc4random arc4random_buf arc4random_addrandom eventfd epoll_create1 epoll_pwait2 fcntl getegid geteuid getifaddrs gettimeofday issetugid mach_absolute_time mmap nanosleep pipe pipe2 pread putenv sendfile setenv setrlimit sigaction signal strsignal strlcpy strsep strtok_r strtoll sysctl timerfd_create umask unsetenv usleep getrandom mmap64]) AS_IF([test "$bwin32" = "true"], AC_CHECK_FUNCS(_gmtime64_s, , [AC_CHECK_FUNCS(_gmtime64)]) ) AM_CONDITIONAL(STRLCPY_IMPL, [test "$ac_cv_func_strlcpy" = "no"]) m4_define([funcstochk], [getnameinfo getprotobynumber getservbyname inet_ntop inet_pton]) AS_IF([test "$bwin32" = "true"], [AX_CHECK_DECLS_EX([funcstochk getaddrinfo], [#ifdef _WIN32 #include #include #endif])], [AC_CHECK_FUNCS(m4_normalize(funcstochk))] ) m4_undefine([funcstochk]) dnl check getaddrinfo and gethostbyname_r for non-windows AS_IF([test x$bwin32 = xfalse], [ AC_CACHE_CHECK( [for getaddrinfo], [libevent_cv_getaddrinfo], [AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[ #ifdef HAVE_NETDB_H #include #endif ]], [[ getaddrinfo; ]] )], [libevent_cv_getaddrinfo=yes], [libevent_cv_getaddrinfo=no] )] ) if test "$libevent_cv_getaddrinfo" = "yes" ; then AC_DEFINE([HAVE_GETADDRINFO], [1], [Do we have getaddrinfo()?]) else dnl Check for gethostbyname_r in all its glorious incompatible versions. dnl (This is cut-and-pasted from Tor, which based its logic on dnl Python's configure.in.) AH_TEMPLATE(HAVE_GETHOSTBYNAME_R, [Define this if you have any gethostbyname_r()]) AC_CHECK_FUNC(gethostbyname_r, [ AC_MSG_CHECKING([how many arguments gethostbyname_r() wants]) OLD_CFLAGS=$CFLAGS CFLAGS="$CFLAGS $MY_CPPFLAGS $MY_THREAD_CPPFLAGS $MY_CFLAGS" AC_COMPILE_IFELSE([AC_LANG_PROGRAM([ #include ], [[ char *cp1, *cp2; struct hostent *h1, *h2; int i1, i2; (void)gethostbyname_r(cp1,h1,cp2,i1,&h2,&i2); ]])],[ AC_DEFINE(HAVE_GETHOSTBYNAME_R) AC_DEFINE(HAVE_GETHOSTBYNAME_R_6_ARG, 1, [Define this if gethostbyname_r takes 6 arguments]) AC_MSG_RESULT(6) ], [ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([ #include ], [ char *cp1, *cp2; struct hostent *h1; int i1, i2; (void)gethostbyname_r(cp1,h1,cp2,i1,&i2); ])], [ AC_DEFINE(HAVE_GETHOSTBYNAME_R) AC_DEFINE(HAVE_GETHOSTBYNAME_R_5_ARG, 1, [Define this if gethostbyname_r takes 5 arguments]) AC_MSG_RESULT(5) ], [ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([ #include ], [ char *cp1; struct hostent *h1; struct hostent_data hd; (void) gethostbyname_r(cp1,h1,&hd); ])], [ AC_DEFINE(HAVE_GETHOSTBYNAME_R) AC_DEFINE(HAVE_GETHOSTBYNAME_R_3_ARG, 1, [Define this if gethostbyname_r takes 3 arguments]) AC_MSG_RESULT(3) ], [ AC_MSG_RESULT(0) ]) ]) ]) CFLAGS=$OLD_CFLAGS ]) fi ]) dnl end of checking getaddrinfo and gethostbyname_r AC_MSG_CHECKING(for F_SETFD in fcntl.h) AC_EGREP_CPP(yes, [ #define _GNU_SOURCE 1 #include #ifdef F_SETFD yes #endif ], [ AC_DEFINE(HAVE_SETFD, 1, [Define if F_SETFD is defined in ]) AC_MSG_RESULT(yes) ], AC_MSG_RESULT(no)) needsignal=no haveselect=no if test "$bwin32" != "true"; then AC_CHECK_FUNCS(select, [haveselect=yes], ) if test "$haveselect" = "yes" ; then needsignal=yes fi fi AM_CONDITIONAL(SELECT_BACKEND, [test "$haveselect" = "yes"]) havepoll=no AC_CHECK_FUNCS(poll, [havepoll=yes], ) if test "$havepoll" = "yes" ; then needsignal=yes fi AM_CONDITIONAL(POLL_BACKEND, [test "$havepoll" = "yes"]) havedevpoll=no if test "$ac_cv_header_sys_devpoll_h" = "yes"; then AC_DEFINE(HAVE_DEVPOLL, 1, [Define if /dev/poll is available]) fi AM_CONDITIONAL(DEVPOLL_BACKEND, [test "$ac_cv_header_sys_devpoll_h" = "yes"]) havekqueue=no if test "$ac_cv_header_sys_event_h" = "yes"; then AC_CHECK_FUNCS(kqueue, [havekqueue=yes], ) if test "$havekqueue" = "yes" ; then AC_MSG_CHECKING(for working kqueue) AC_RUN_IFELSE( [AC_LANG_PROGRAM([ #ifdef HAVE_STDLIB_H #include #endif #ifdef HAVE_STRING_H #include #endif #include #include #include #include #include #include ], [[ int kq; int n; int fd[2]; struct kevent ev; struct timespec ts; char buf[80000]; if (pipe(fd) == -1) return 1; if (fcntl(fd[1], F_SETFL, O_NONBLOCK) == -1) return 1; while ((n = write(fd[1], buf, sizeof(buf))) == sizeof(buf)) ; if ((kq = kqueue()) == -1) return 1; memset(&ev, 0, sizeof(ev)); ev.ident = fd[1]; ev.filter = EVFILT_WRITE; ev.flags = EV_ADD | EV_ENABLE; n = kevent(kq, &ev, 1, NULL, 0, NULL); if (n == -1) return 1; read(fd[0], buf, sizeof(buf)); ts.tv_sec = 0; ts.tv_nsec = 0; n = kevent(kq, NULL, 0, &ev, 1, &ts); if (n == -1 || n == 0) return 1; return 0; ]] )], [AC_MSG_RESULT(yes) AC_DEFINE(HAVE_WORKING_KQUEUE, 1, [Define if kqueue works correctly with pipes]) havekqueue=yes ], [AC_MSG_RESULT(no)], [AC_MSG_RESULT(no)] ) fi fi AM_CONDITIONAL(KQUEUE_BACKEND, [test "$havekqueue" = "yes"]) haveepollsyscall=no haveepoll=no AC_CHECK_FUNCS(epoll_ctl, [haveepoll=yes], ) if test "$haveepoll" = "yes" ; then AC_DEFINE(HAVE_EPOLL, 1, [Define if your system supports the epoll system calls]) needsignal=yes fi if test "$ac_cv_header_sys_epoll_h" = "yes"; then if test "$haveepoll" = "no" ; then AC_MSG_CHECKING(for epoll system call) AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include #include #include #include #include #include int epoll_create(int size) { return (syscall(__NR_epoll_create, size)); } ]],[[ int epfd; epfd = epoll_create(256); return (epfd == -1 ? 1 : 0); ]] )], [AC_MSG_RESULT(yes) AC_DEFINE(HAVE_EPOLL, 1, [Define if your system supports the epoll system calls]) needsignal=yes have_epoll=yes AC_LIBOBJ(epoll_sub) ], [AC_MSG_RESULT(no)], [AC_MSG_RESULT(no)] ) fi fi AM_CONDITIONAL(EPOLL_BACKEND, [test "$haveepoll" = "yes"]) haveeventports=no AC_CHECK_FUNCS(port_create, [haveeventports=yes], ) if test "$haveeventports" = "yes" ; then AC_DEFINE(HAVE_EVENT_PORTS, 1, [Define if your system supports event ports]) needsignal=yes fi AM_CONDITIONAL(EVPORT_BACKEND, [test "$haveeventports" = "yes"]) havewepoll=no if test "$bwin32" = "true"; then needsignal=yes if test "$cygwin" = "false"; then havewepoll=yes AC_DEFINE(HAVE_WEPOLL, 1, [Define if your system supports the wepoll module]) fi fi AM_CONDITIONAL(WEPOLL_BACKEND, [test "$havewepoll" = "yes"]) AM_CONDITIONAL(SIGNAL_SUPPORT, [test "$needsignal" = "yes"]) AM_CONDITIONAL(SIGNALFD_SUPPORT, [test "$ac_cv_header_sys_signalfd_h" = "yes"]) 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 #elif defined(HAVE_INTTYPES_H) #include #endif #ifdef HAVE_SYS_TYPES_H #include #endif]) AC_CHECK_TYPES([fd_mask], , , [#ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_SELECT_H #include #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_SIZEOF(off_t) AC_CHECK_SIZEOF(time_t) AC_CHECK_TYPES([struct in6_addr, struct sockaddr_in6, struct sockaddr_un, sa_family_t, struct addrinfo, struct sockaddr_storage], , , [#define _GNU_SOURCE 1 #include #ifdef HAVE_NETINET_IN_H #include #endif #ifdef HAVE_NETINET_IN6_H #include #endif #ifdef HAVE_SYS_UN_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_NETDB_H #include #endif #ifdef _WIN32 #define WIN32_WINNT 0x400 #define _WIN32_WINNT 0x400 #define WIN32_LEAN_AND_MEAN #if defined(_MSC_VER) && (_MSC_VER < 1300) #include #else #include #include #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 #ifdef HAVE_NETINET_IN_H #include #endif #ifdef HAVE_NETINET_IN6_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef _WIN32 #define WIN32_WINNT 0x400 #define _WIN32_WINNT 0x400 #define WIN32_LEAN_AND_MEAN #if defined(_MSC_VER) && (_MSC_VER < 1300) #include #else #include #include #endif #endif ]) AC_CHECK_TYPES([struct linger],,, [ #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef _WIN32 #include #endif ]) AC_MSG_CHECKING([for socklen_t]) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([ #include #ifdef _WIN32 #include #else #include #endif ],[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])] ) dnl __func__/__FUNCTION__ is not a macros in general AC_MSG_CHECKING([whether our compiler supports __func__]) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([], [ const char *cp = __func__; ] )], [ AC_DEFINE(HAVE___func__, 1, [Define to 1 if compiler have __func__]) AC_MSG_RESULT([yes]) ], [AC_MSG_RESULT([no])] ) AC_MSG_CHECKING([whether our compiler supports __FUNCTION__]) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([], [ const char *cp = __FUNCTION__; ] )], [ AC_DEFINE(HAVE___FUNCTION__, 1, [Define to 1 if compiler have __FUNCTION__]) AC_MSG_RESULT([yes]) ], [AC_MSG_RESULT([no])] ) dnl check if we can compile with pthreads have_pthreads=no if test "$bwin32" != "true" && test "$enable_thread_support" != "no"; then AX_PTHREAD([ AC_DEFINE([HAVE_PTHREADS], [1], [Define if we have pthreads on this system]) have_pthreads=yes ]) CFLAGS="$CFLAGS $PTHREAD_CFLAGS" AC_CHECK_SIZEOF([pthread_t], [], [AC_INCLUDES_DEFAULT() #include ]) AC_CHECK_FUNCS([pthread_mutexattr_setprotocol]) fi AM_CONDITIONAL(THREADS, [test "$enable_thread_support" != "no"]) AM_CONDITIONAL(PTHREADS, [test "$have_pthreads" != "no" && test "$enable_thread_support" != "no"]) dnl check if we should compile locking into the library if test "$enable_thread_support" = "no"; then AC_DEFINE(DISABLE_THREAD_SUPPORT, 1, [Define if libevent should not be compiled with thread support]) fi dnl check if we should hard-code the mm functions. if test "$enable_malloc_replacement" = "no"; then AC_DEFINE(DISABLE_MM_REPLACEMENT, 1, [Define if libevent should not allow replacing the mm functions]) fi dnl check if we should hard-code debugging out if test "$enable_debug_mode" = "no"; then AC_DEFINE(DISABLE_DEBUG_MODE, 1, [Define if libevent should build without support for a debug mode]) fi dnl check if we should enable verbose debugging if test "$enable_verbose_debug" = "yes"; then CFLAGS="$CFLAGS -DUSE_DEBUG" fi dnl check if we have and should use OpenSSL AM_CONDITIONAL(OPENSSL, [test "$enable_openssl" != "no" && test "$have_openssl" = "yes"]) # check if we have and should use mbedtls AM_CONDITIONAL(MBEDTLS, [test "$enable_mbedtls" != "no" && test "$have_mbedtls" = "yes"]) dnl enable some warnings by default AX_CHECK_COMPILE_FLAG([-Wall], [CFLAGS="$CFLAGS -Wall"],[],[-Werror]) dnl Disable the strict-aliasing optimization, since it breaks dnl our sockaddr-handling code in strange ways. dnl See 52eb4951302554dd696d6a0120ad5d3f6cffb7bb. AX_CHECK_COMPILE_FLAG([-fno-strict-aliasing], [CFLAGS="$CFLAGS -fno-strict-aliasing"],[],[-Werror]) dnl Add warnings which we use in development but not for releases. if test "$enable_gcc_warnings" != "no" && test "$GCC" = "yes"; then dnl -W is the same as -Wextra AX_CHECK_COMPILE_FLAG([-W], [CFLAGS="$CFLAGS -W"],[],[-Werror]) dnl The AX_CHECK_COMPILE_FLAG macro ignores warnings, so -Werror is used dnl to convert warnings into errors and prevent the addition of unknown flags. AX_CHECK_COMPILE_FLAG([-Waddress],[CFLAGS="$CFLAGS -Waddress"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wbad-function-cast],[CFLAGS="$CFLAGS -Wbad-function-cast"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wdeclaration-after-statement],[CFLAGS="$CFLAGS -Wdeclaration-after-statement"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wfloat-equal],[CFLAGS="$CFLAGS -Wfloat-equal"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Winit-self],[CFLAGS="$CFLAGS -Winit-self"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wlogical-op],[CFLAGS="$CFLAGS -Wlogical-op"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wmissing-declarations],[CFLAGS="$CFLAGS -Wmissing-declarations"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wmissing-field-initializers],[CFLAGS="$CFLAGS -Wmissing-field-initializers"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wmissing-prototypes],[CFLAGS="$CFLAGS -Wmissing-prototypes"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wnested-externs],[CFLAGS="$CFLAGS -Wnested-externs"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wnormalized=id],[CFLAGS="$CFLAGS -Wnormalized=id"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Woverride-init],[CFLAGS="$CFLAGS -Woverride-init"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wpointer-arith],[CFLAGS="$CFLAGS -Wpointer-arith"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wredundant-decls],[CFLAGS="$CFLAGS -Wredundant-decls"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wstrict-prototypes],[CFLAGS="$CFLAGS -Wstrict-prototypes"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wundef],[CFLAGS="$CFLAGS -Wundef"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wwrite-strings],[CFLAGS="$CFLAGS -Wwrite-strings"],[],[-Werror]) dnl Convert warnings into errors if test "$enable_gcc_warnings" = "yes"; then AX_CHECK_COMPILE_FLAG([-Werror], [CFLAGS="$CFLAGS -Werror"]) fi dnl Disable warnings for unused parameters AX_CHECK_COMPILE_FLAG([-Wunused-parameter], [CFLAGS="$CFLAGS -Wno-unused-parameter"],[],[-Werror]) AX_CHECK_COMPILE_FLAG([-Wvoid-pointer-to-enum-cast], [CFLAGS="$CFLAGS -Wno-void-pointer-to-enum-cast"],[],[-Werror]) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [ #if !defined(__clang__) #error #endif])], have_clang=yes, have_clang=no) dnl Disable unused-function warnings. These trigger for minheap-internal.h. AX_CHECK_COMPILE_FLAG([-Wno-unused-function], [CFLAGS="$CFLAGS -Wno-unused-function"],[],[-Werror]) dnl Disable unknown pragmas warnings. AX_CHECK_COMPILE_FLAG([-Wno-pragmas], [CFLAGS="$CFLAGS -Wno-pragmas"],[],[-Werror]) dnl Disable Variable Lenght Array AX_CHECK_COMPILE_FLAG([-Wvla], [CFLAGS="$CFLAGS -Wvla"],[],[-Werror]) if test "$have_clang" = "yes"; then case "$host_os" in darwin*) dnl Clang on macOS emits warnings for each directory specified which dnl isn't "used", generating a lot of build noise. AX_CHECK_COMPILE_FLAG([-Qunused-arguments], [CFLAGS="$CFLAGS -Qunused-arguments"],[],[-Werror]) esac fi fi LIBEVENT_GC_SECTIONS= if test "$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="$CFLAGS -Wl,--gc-sections" AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[ #include #include ]], [[ FILE * fpC; char buf[32]; size_t cch; int read_success_once; fpC = fopen("conftest.c", "r"); if (NULL == fpC) exit(1); do { cch = fread(buf, sizeof(buf), 1, fpC); read_success_once |= (0 != cch); } while (0 != cch); if (!read_success_once) exit(2); if (!feof(fpC)) exit(3); if (0 != fclose(fpC)) exit(4); exit(EXIT_SUCCESS); ]] )], [ dnl We have to do this invocation manually so that we can dnl get the output of conftest.err to make sure it doesn't dnl mention gc-sections. if test "$cross_compiling" = "yes" || 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_C_BIGENDIAN([CFLAGS="$CFLAGS -DBIG_ENDIAN"], [CFLAGS="$CFLAGS -DLITTLE_ENDIAN"]) dnl Doxygen support DX_HTML_FEATURE(ON) DX_MAN_FEATURE(OFF) DX_RTF_FEATURE(OFF) DX_XML_FEATURE(OFF) DX_PDF_FEATURE(OFF) DX_PS_FEATURE(OFF) DX_CHM_FEATURE(OFF) DX_CHI_FEATURE(OFF) DX_INIT_DOXYGEN([libevent], [${top_srcdir}/Doxyfile], [doxygen]) AM_CONDITIONAL([ENABLE_DOXYGEN], [test "$DX_FLAG_doc" = "1"]) AM_CONDITIONAL([ENABLE_DOXYGEN_MAN], [test "$DX_FLAG_man" = "1"]) AC_CONFIG_FILES([Makefile libevent.pc libevent_mbedtls.pc libevent_openssl.pc libevent_pthreads.pc libevent_core.pc libevent_extra.pc] ) AC_OUTPUT