r11596@catbus: nickm | 2007-01-30 01:43:40 -0500
Macro-ize our "search for a library and find out how to link against it" code. This will help make our handling of libevent and openssl more similar, and with any luck better. Not pushing to main branch until after 0.1.2. svn:r9726
This commit is contained in:
Nick Mathewson
parent
70e5a83a77
commit
0e44371a33
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dnl $Id$
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dnl Helper macros for Tor configure.in
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dnl Copyright (c) 2001-2004, Roger Dingledine
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dnl Copyright (c) 2004-2007, Roger Dingledine, Nick Mathewson
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dnl See LICENSE for licensing information
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AC_DEFUN([TOR_EXTEND_CODEPATH],
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[
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if test -d "$1/lib"; then
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LDFLAGS="-L$1/lib $LDFLAGS"
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else
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LDFLAGS="-L$1 $LDFLAGS"
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fi
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if test -d "$1/include"; then
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CPPFLAGS="-I$1/include $CPPFLAGS"
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else
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CPPFLAGS="-I$1 $CPPFLAGS"
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fi
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])
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dnl Look for a library, and its associated includes, and how to link
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dnl against it.
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dnl
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dnl TOR_SEARCH_LIBRARY(libname, withlocation, linkargs, headers, prototype,
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dnl code, optionname)
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AC_DEFUN([TOR_SEARCH_LIBRARY], [
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tor_saved_LIBS="$LIBS"
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tor_saved_LDFLAGS="$LDFLAGS"
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tor_saved_CPPFLAGS="$CPPFLAGS"
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AC_CACHE_CHECK([for $1 directory], tor_cv_library_$1_dir, [
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tor_$1_dir_found=no
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tor_$1_any_linkable=no
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for tor_trydir in "$2" "(system)" "$prefix" /usr/local /usr/pkg; do
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LDFLAGS="$tor_saved_LDFLAGS"
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LIBS="$tor_saved_LIBS $3"
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CPPFLAGS="$tor_saved_CPPFLAGS"
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if test -z "$tor_trydir" ; then
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continue;
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fi
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# Skip the directory if it isn't there.
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if test ! -d "$tor_trydir" -a "$tor_trydir" != "(system)"; then
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continue;
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fi
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# If this isn't blank, try adding the directory (or appropriate
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# include/libs subdirectories) to the command line.
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if test "$tor_trydir" != "(system)"; then
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TOR_EXTEND_CODEPATH($tor_trydir)
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fi
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# Can we link against (but not necessarily compile) the binary?
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AC_LINK_IFELSE(AC_LANG_PROGRAM([$5], [$6]),
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[linkable=yes], [linkable=no])
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if test $linkable = yes; then
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tor_$1_any_linkable=yes
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AC_COMPILE_IFELSE(AC_LANG_PROGRAM([$4], [$6]),
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[buildable=yes], [buildable=no])
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if test $buildable = yes; then
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tor_cv_library_$1_dir=$tor_trydir
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tor_$1_dir_found=yes
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break
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fi
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fi
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done
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if test $tor_$1_dir_found = no; then
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if test $tor_$1_any_linkable = no ; then
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AC_MSG_ERROR([Could not find a linkable $1. You can specify an explicit path using $7])
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else
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AC_MSG_ERROR([We found the libraries for $1, but we could not find the C header files. You may need to install a devel package.])
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fi
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fi
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LDFLAGS="$tor_saved_LDFLAGS"
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LIBS="$tor_saved_LIBS $3"
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CPPFLAGS="$tor_saved_CPPFLAGS"
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]) dnl end cache check
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LIBS="$LIBS $3"
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if test $tor_cv_library_$1_dir != "(system)"; then
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TOR_EXTEND_CODEPATH($tor_cv_library_$1_dir)
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fi
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if test -z "$CROSS_COMPILE"; then
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AC_CACHE_CHECK([whether we need extra options to link $1],
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tor_cv_library_$1_linker_option, [
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tor_saved_LDFLAGS="$LDFLAGS"
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tor_trydir="$tor_cv_library_$1_dir"
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runs=no
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linked_with=nothing
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for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
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"-Wl,-rpath,$le_libdir" ; do
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if test "$tor_tryextra" = "(none)"; then
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LDFLAGS="$saved_LDFLAGS"
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else
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LDFLAGS="$tor_tryextra $saved_LDFLAGS"
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fi
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AC_RUN_IFELSE(AC_LANG_PROGRAM([$5], [$6]),
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[runnable=yes], [runnable=no])
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if test "$runnable" = yes; then
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tor_cv_library_$1_linker_option=$tor_tryextra
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break
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fi
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done
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if test "$runnable" = no; then
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AC_MSG_ERROR([Found linkable $1 in $tor_cv_library_$1_dir, but it does not seem to run, even with -R. Maybe specify another using $7}])
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fi
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]) dnl check for extra options.
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if test "$tor_cv_library_$1_linker_option" != "(none)" ; then
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LDFLAGS="$tor_cv_library_$1_linker_option $LDFLAGS"
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fi
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fi # cross-compile
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]) dnl end defun
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#XXXX Check for right version
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#XXXX accept list of search paths as options
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109
configure.in
109
configure.in
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@ -202,112 +202,11 @@ AC_CHECK_TYPE(u_int32_t, unsigned long)
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AC_CHECK_TYPE(u_int16_t, unsigned short)
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AC_CHECK_TYPE(u_int8_t, unsigned char)
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AC_CACHE_CHECK([for libevent directory], tor_cv_libevent_dir, [
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saved_LIBS="$LIBS"
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saved_LDFLAGS="$LDFLAGS"
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saved_CPPFLAGS="$CPPFLAGS"
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le_found=no
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for ledir in $trylibeventdir "" $prefix /usr/local /usr/pkg ; do
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LDFLAGS="$saved_LDFLAGS"
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if test $bwin32 = true; then
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LIBS="$saved_LIBS -levent -lws2_32"
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else
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LIBS="$saved_LIBS -levent"
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fi
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# Skip the directory if it isn't there.
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if test ! -z "$ledir" -a ! -d "$ledir" ; then
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continue;
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fi
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if test ! -z "$ledir" ; then
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if test -d "$ledir/lib" ; then
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LDFLAGS="-L$ledir/lib $LDFLAGS"
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else
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LDFLAGS="-L$ledir $LDFLAGS"
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fi
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if test -d "$ledir/include" ; then
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CPPFLAGS="-I$ledir/include $CPPFLAGS"
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else
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CPPFLAGS="-I$ledir $CPPFLAGS"
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fi
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fi
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# Can I compile and link it?
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AC_TRY_LINK([#include <sys/time.h>
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TOR_SEARCH_LIBRARY(libevent, $trylibeventdir, [-levent $WS32lib], [
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#include <sys/time.h>
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#include <sys/types.h>
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#include <event.h>], [ event_init(); ],
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[ libevent_linked=yes ], [ libevent_linked=no ])
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if test $libevent_linked = yes; then
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if test ! -z "$ledir" ; then
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tor_cv_libevent_dir=$ledir
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else
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tor_cv_libevent_dir="(system)"
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fi
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le_found=yes
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break
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fi
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done
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LIBS="$saved_LIBS"
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LDFLAGS="$saved_LDFLAGS"
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CPPFLAGS="$saved_CPPFLAGS"
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if test $le_found = no ; then
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AC_MSG_ERROR([Could not find a linkable libevent. You can specify an explicit path using --with-libevent-dir])
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fi
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])
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if test $bwin32 = true; then
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LIBS="$LIBS -levent -lws2_32"
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else
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LIBS="$LIBS -levent"
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fi
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if test $tor_cv_libevent_dir != "(system)"; then
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if test -d "$tor_cv_libevent_dir/lib" ; then
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LDFLAGS="-L$tor_cv_libevent_dir/lib $LDFLAGS"
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le_libdir="$tor_cv_libevent_dir/lib"
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else
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LDFLAGS="-L$tor_cv_libevent_dir $LDFLAGS"
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le_libdir="$tor_cv_libevent_dir"
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fi
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if test -d "$tor_cv_libevent_dir/include" ; then
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CPPFLAGS="-I$tor_cv_libevent_dir/include $CPPFLAGS"
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else
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CPPFLAGS="-I$tor_cv_libevent_dir $CPPFLAGS"
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fi
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fi
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if test -z "$CROSS_COMPILE"; then
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AC_CACHE_CHECK([whether we need extra options to link libevent],
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tor_cv_libevent_linker_option, [
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saved_LDFLAGS="$LDFLAGS"
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le_runs=no
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linked_with=nothing
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for le_extra in "" "-Wl,-R$le_libdir" "-R$le_libdir" "-Wl,-rpath,$le_libdir" ; do
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LDFLAGS="$le_extra $saved_LDFLAGS"
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AC_TRY_RUN([void *event_init(void);
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int main(int c, char **v) {
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event_init(); return 0;
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}],
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libevent_runs=yes, libevent_runs=no, libevent_runs=cross)
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if test $libevent_runs != no ; then
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if test -z "$le_extra" ; then
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tor_cv_libevent_linker_option='(none)'
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else
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tor_cv_libevent_linker_option=$le_extra
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fi
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le_runs=yes
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break
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fi
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done
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if test $le_runs = no ; then
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AC_MSG_ERROR([Found linkable libevent in $tor_cv_libevent_dir, but it doesn't run, even with -R. Maybe specify another using --with-libevent-dir?])
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fi
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LDFLAGS="$saved_LDFLAGS"
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])
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if test $tor_cv_libevent_linker_option != '(none)' ; then
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LDFLAGS="$tor_cv_libevent_linker_option $LDFLAGS"
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fi
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fi
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#include <event.h>], [void *event_init(void);],
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[event_init(); exit(0);], [--with-libevent-dir])
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dnl Now check for particular libevent functions.
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AC_CHECK_FUNCS(event_get_version event_get_method event_set_log_callback)
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