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 ntp_libevent_version="`$PKG_CONFIG --modversion libevent`" 82 case "$ntp_libevent_version" in 83 *.*) ;; 84 *) ntp_libevent_version='(unknown)' ;; 85 esac 86 AC_MSG_RESULT([yes, version $ntp_libevent_version]) 87 CFLAGS_LIBEVENT=`$PKG_CONFIG --cflags libevent_pthreads` 88 CPPFLAGS_LIBEVENT=`$PKG_CONFIG --cflags-only-I libevent` 89 # HMS: I hope the following is accurate. 90 # We don't need -levent, we only need -levent_core. 91 # While we could grab only the -L stuff, there *might* be 92 # other flags there we want. Originally we just removed -levent 93 # but then somebody decided to install -levent-2.0 94 # LDADD_LIBEVENT=`$PKG_CONFIG --libs libevent | sed 's:-levent::'` 95 # So now we dance... 96 LDADD_LIBEVENT= 97 for i in `$PKG_CONFIG --libs libevent` `$PKG_CONFIG --cflags-only-other libevent_pthreads` 98 do 99 case "$i" in 100 -D*) ;; 101 -levent*) ;; 102 *) case "$LDADD_LIBEVENT" in 103 '') LDADD_LIBEVENT="$i" ;; 104 *) LDADD_LIBEVENT="$LDADD_LIBEVENT $i" ;; 105 esac 106 ;; 107 esac 108 done 109 case "$LIBISC_PTHREADS_NOTHREADS" in 110 pthreads) 111 LDADD_LIBEVENT="$LDADD_LIBEVENT -levent_pthreads" 112 esac 113 LDADD_LIBEVENT="$LDADD_LIBEVENT -levent_core" 114 else 115 ntp_use_local_libevent=yes 116 # HMS: do we only need to do this if LIBISC_PTHREADS_NOTHREADS 117 # is "pthreads"? 118 CFLAGS_LIBEVENT=`$PKG_CONFIG --cflags libevent_pthreads` 119 AC_MSG_RESULT([no]) 120 fi 121 ;; 122 *) 123 ntp_use_local_libevent=yes 124 ;; 125 esac 126 ;; 127esac 128 129case "$ntp_use_local_libevent" in 130 yes) 131 AC_MSG_NOTICE([Using libevent tearoff]) 132 CPPFLAGS_LIBEVENT="-I\$(top_builddir)/$ntp_libevent_tearoff/include -I\$(top_srcdir)/$ntp_libevent_tearoff/include" 133 case "$LIBISC_PTHREADS_NOTHREADS" in 134 pthreads) 135 LDADD_LIBEVENT="\$(top_builddir)/$ntp_libevent_tearoff/libevent_pthreads.la \$(top_builddir)/$ntp_libevent_tearoff/libevent_core.la" 136 ;; 137 *) 138 LDADD_LIBEVENT="\$(top_builddir)/$ntp_libevent_tearoff/libevent_core.la" 139 esac 140esac 141 142dnl AC_ARG_ENABLE( 143dnl [cflags-libevent], 144dnl [AC_HELP_STRING( 145dnl [--enable-cflags-libevent=-pthread], 146dnl [CFLAGS value to build with pthreads] 147dnl )], 148dnl [CFLAGS_LIBEVENT=$enableval], 149dnl [# See above about LIBISC_PTHREADS_NOTHREADS 150dnl case "$CFLAGS_LIBEVENT" in 151dnl '') CFLAGS_LIBEVENT="-pthread" ;; 152dnl *) ;; 153dnl esac] 154dnl ) 155dnl AC_MSG_NOTICE([LIBISC_PTHREADS_NOTHREADS is <$LIBISC_PTHREADS_NOTHREADS>]) 156dnl AC_MSG_NOTICE([CFLAGS_LIBEVENT is <$CFLAGS_LIBEVENT>]) 157 158AM_CONDITIONAL([BUILD_LIBEVENT], [test "x$ntp_use_local_libevent" = "xyes"]) 159 160]) dnl NTP_LIBEVENT_CHECK_NOBUILD 161 162dnl NTP_LIBEVENT_CHECK([MINVERSION [, DIR]]) -*- Autoconf -*- 163AC_DEFUN([NTP_LIBEVENT_CHECK], [ 164 165AC_SUBST([NTP_FORCE_LIBEVENT_DIST]) 166NTP_LIBEVENT_CHECK_NOBUILD([$1], [$2]) 167 168case "$ntp_libevent_tearoff" in 169 libevent) 170 ;; 171 *) 172 AC_MSG_ERROR([ntp_libevent.m4 dir must be libevent, not $ntp_libevent_tearoff]) 173 ;; 174esac 175 176case "$ntp_use_local_libevent" in 177 yes) 178 dnl ac_configure_args is undocumented but widely abused, as here, 179 dnl to modify the defaults of the libevent subpackage, by prefixing 180 dnl our changes to the child configure arguments already assembled. 181 dnl User-supplied contradictory choices should prevail thanks to 182 dnl "last wins". 183 ac_configure_args=" --disable-openssl${ac_configure_args}" 184 ac_configure_args=" --disable-shared${ac_configure_args}" 185 ac_configure_args=" --disable-libevent-regress${ac_configure_args}" 186 ac_configure_args=" --disable-libevent-install${ac_configure_args}" 187 ac_configure_args=" --enable-silent-rules${ac_configure_args}" 188 ac_configure_args=" --enable-function-sections${ac_configure_args}" 189 ac_configure_args=" LEP_CFLAGS='${NTP_HARD_CFLAGS}'${ac_configure_args}" 190 ac_configure_args=" LEP_CPPFLAGS='${NTP_HARD_CPPFLAGS}'${ac_configure_args}" 191 ac_configure_args=" LEP_LDFLAGS='${NTP_HARD_LDFLAGS}'${ac_configure_args}" 192 AC_CONFIG_SUBDIRS([libevent]) 193 ;; 194 *) 195 NTP_FORCE_LIBEVENT_DIST=libevent 196 ;; 197esac 198 199]) dnl NTP_LIBEVENT_CHECK 200 201