1# SYNOPSIS -*- Autoconf -*- 2# 3# NTP_ENABLE_LOCAL_LIBEVENT 4# NTP_LIBEVENT_CHECK([MINVERSION [, DIR]]) 5# NTP_LIBEVENT_CHECK_NOBUILD([MINVERSION [, DIR]]) 6# 7# DESCRIPTION 8# 9# AUTHOR 10# 11# Harlan Stenn 12# 13# LICENSE 14# 15# This file is Copyright (c) 2014 Network Time Foundation 16# 17# Copying and distribution of this file, with or without modification, are 18# permitted in any medium without royalty provided the copyright notice, 19# author attribution and this notice are preserved. This file is offered 20# as-is, without any warranty. 21 22dnl NTP_ENABLE_LOCAL_LIBEVENT 23dnl 24dnl Provide only the --enable-local-libevent command-line option. 25dnl 26dnl Used standalone by top-level NTP configure.ac, which should have 27dnl --enable-local-libevent in its --help output but which doesn't do 28dnl anything differently based upon its presence or value. 29dnl 30dnl Also AC_REQUIRE'd by NTP_LIBEVENT_CHECK_NOBUILD. 31AC_DEFUN([NTP_ENABLE_LOCAL_LIBEVENT], [ 32 33AC_ARG_ENABLE( 34 [local-libevent], 35 [AC_HELP_STRING( 36 [--enable-local-libevent], 37 [Force using the supplied libevent tearoff code] 38 )], 39 [ntp_use_local_libevent=$enableval], 40 [ntp_use_local_libevent=${ntp_use_local_libevent-detect}] 41) 42 43]) dnl NTP_ENABLE_LOCAL_LIBEVENT 44 45dnl NTP_LIBEVENT_CHECK_NOBUILD([MINVERSION [, DIR]]) -*- Autoconf -*- 46dnl 47dnl Look for libevent, which must be at least MINVERSION. 48dnl DIR is the location of our "bundled" copy of libevent. 49dnl If NOBUILD is provided as the 3rd argument, do all of the above, 50dnl but DO NOT invoke DIR/configure if we are going to use our bundled 51dnl version. This may be the case for nested packages. 52dnl 53dnl provides: --enable-local-libevent 54dnl 55dnl Examples: 56dnl 57dnl NTP_LIBEVENT_CHECK_NOBUILD([2.0.9], [sntp/libevent]) 58dnl NTP_LIBEVENT_CHECK 59dnl 60AC_DEFUN([NTP_LIBEVENT_CHECK_NOBUILD], [ 61AC_REQUIRE([NTP_PKG_CONFIG])dnl 62AC_REQUIRE([NTP_ENABLE_LOCAL_LIBEVENT])dnl 63 64ntp_libevent_min_version=m4_default([$1], [2.0.9]) 65ntp_libevent_tearoff=m4_default([$2], [libevent]) 66 67AC_SUBST([CFLAGS_LIBEVENT]) 68AC_SUBST([CPPFLAGS_LIBEVENT]) 69AC_SUBST([LDADD_LIBEVENT]) 70 71case "$ntp_use_local_libevent" in 72 yes) 73 ;; 74 *) # If we have (a good enough) pkg-config, see if it can find libevent 75 case "$PKG_CONFIG" in 76 /*) 77 AC_MSG_CHECKING([if libevent $ntp_libevent_min_version or later is installed]) 78 if $PKG_CONFIG --atleast-version=$ntp_libevent_min_version libevent 79 then 80 ntp_use_local_libevent=no 81 AC_MSG_NOTICE([Using the installed libevent]) 82 CFLAGS_LIBEVENT=`$PKG_CONFIG --cflags libevent_pthreads` 83 CPPFLAGS_LIBEVENT=`$PKG_CONFIG --cflags-only-I libevent` 84 # HMS: I hope the following is accurate. 85 # We don't need -levent, we only need -levent_core. 86 # While we could grab only the -L stuff, there *might* be 87 # other flags there we want. Originally we just removed -levent 88 # but then somebody decided to install -levent-2.0 89 # LDADD_LIBEVENT=`$PKG_CONFIG --libs libevent | sed 's:-levent::'` 90 # So now we dance... 91 LDADD_LIBEVENT= 92 for i in `$PKG_CONFIG --libs libevent` 93 do 94 case "$i" in 95 -levent*) ;; 96 *) case "$LDADD_LIBEVENT" in 97 '') LDADD_LIBEVENT="$i" ;; 98 *) LDADD_LIBEVENT="$LDADD_LIBEVENT $i" ;; 99 esac 100 ;; 101 esac 102 done 103 case "$LIBISC_PTHREADS_NOTHREADS" in 104 pthreads) 105 LDADD_LIBEVENT="$LDADD_LIBEVENT -levent_pthreads" 106 esac 107 LDADD_LIBEVENT="$LDADD_LIBEVENT -levent_core" 108 AC_MSG_RESULT([yes]) 109 else 110 ntp_use_local_libevent=yes 111 # HMS: do we only need to do this if LIBISC_PTHREADS_NOTHREADS 112 # is "pthreads"? 113 CFLAGS_LIBEVENT=`$PKG_CONFIG --cflags libevent_pthreads` 114 AC_MSG_RESULT([no]) 115 fi 116 ;; 117 *) 118 ntp_use_local_libevent=yes 119 ;; 120 esac 121 ;; 122esac 123 124case "$ntp_use_local_libevent" in 125 yes) 126 AC_MSG_NOTICE([Using libevent tearoff]) 127 CPPFLAGS_LIBEVENT="-I\$(top_builddir)/$ntp_libevent_tearoff/include -I\$(top_srcdir)/$ntp_libevent_tearoff/include" 128 case "$LIBISC_PTHREADS_NOTHREADS" in 129 pthreads) 130 LDADD_LIBEVENT="\$(top_builddir)/$ntp_libevent_tearoff/libevent_pthreads.la \$(top_builddir)/$ntp_libevent_tearoff/libevent_core.la" 131 ;; 132 *) 133 LDADD_LIBEVENT="\$(top_builddir)/$ntp_libevent_tearoff/libevent_core.la" 134 esac 135esac 136 137dnl AC_ARG_ENABLE( 138dnl [cflags-libevent], 139dnl [AC_HELP_STRING( 140dnl [--enable-cflags-libevent=-pthread], 141dnl [CFLAGS value to build with pthreads] 142dnl )], 143dnl [CFLAGS_LIBEVENT=$enableval], 144dnl [# See above about LIBISC_PTHREADS_NOTHREADS 145dnl case "$CFLAGS_LIBEVENT" in 146dnl '') CFLAGS_LIBEVENT="-pthread" ;; 147dnl *) ;; 148dnl esac] 149dnl ) 150dnl AC_MSG_NOTICE([LIBISC_PTHREADS_NOTHREADS is <$LIBISC_PTHREADS_NOTHREADS>]) 151dnl AC_MSG_NOTICE([CFLAGS_LIBEVENT is <$CFLAGS_LIBEVENT>]) 152 153AM_CONDITIONAL([BUILD_LIBEVENT], [test "x$ntp_use_local_libevent" = "xyes"]) 154 155]) dnl NTP_LIBEVENT_CHECK_NOBUILD 156 157dnl NTP_LIBEVENT_CHECK([MINVERSION [, DIR]]) -*- Autoconf -*- 158AC_DEFUN([NTP_LIBEVENT_CHECK], [ 159 160AC_SUBST([NTP_FORCE_LIBEVENT_DIST]) 161NTP_LIBEVENT_CHECK_NOBUILD([$1], [$2]) 162 163case "$ntp_libevent_tearoff" in 164 libevent) 165 ;; 166 *) 167 AC_MSG_ERROR([ntp_libevent.m4 dir must be libevent, not $ntp_libevent_tearoff]) 168 ;; 169esac 170 171case "$ntp_use_local_libevent" in 172 yes) 173 dnl ac_configure_args is undocumented but widely abused, as here, 174 dnl to modify the defaults of the libevent subpackage, by prefixing 175 dnl our changes to the child configure arguments already assembled. 176 dnl User-supplied contradictory choices should prevail thanks to 177 dnl "last wins". 178 ac_configure_args=" --disable-openssl${ac_configure_args}" 179 ac_configure_args=" --disable-shared${ac_configure_args}" 180 ac_configure_args=" --disable-libevent-regress${ac_configure_args}" 181 ac_configure_args=" --disable-libevent-install${ac_configure_args}" 182 ac_configure_args=" --enable-silent-rules${ac_configure_args}" 183 ac_configure_args=" --enable-function-sections${ac_configure_args}" 184 AC_CONFIG_SUBDIRS([libevent]) 185 ;; 186 *) 187 NTP_FORCE_LIBEVENT_DIST=libevent 188 ;; 189esac 190 191]) dnl NTP_LIBEVENT_CHECK 192 193