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