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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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+
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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 $CPPFLAGS"
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+ fi
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+])
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+
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+dnl Look for a library, and its associated includes, and how to link
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+dnl against it.
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+dnl
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+dnl TOR_SEARCH_LIBRARY(libname, withlocation, linkargs, headers, prototype,
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+dnl code, optionname)
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+
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+AC_DEFUN([TOR_SEARCH_LIBRARY], [
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+tor_saved_LIBS="$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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+
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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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+
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+ if test -z "$tor_trydir" ; then
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+ continue;
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+ fi
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+
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+ # Skip the directory if it isn't there.
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+ if test ! -d "$tor_trydir" -a "$tor_trydir" != "(system)"; then
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+ continue;
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+ fi
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+
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+ # If this isn't blank, try adding the directory (or appropriate
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+ # include/libs subdirectories) to the command line.
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+ if test "$tor_trydir" != "(system)"; then
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+ TOR_EXTEND_CODEPATH($tor_trydir)
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+ fi
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+
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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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+
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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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+
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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 $1, but we could not find the C header files. You may need to install a devel package.])
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+ fi
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+ fi
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+
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+ LDFLAGS="$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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+
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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_$1_dir)
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+fi
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+
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+if test -z "$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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+
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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 $7}])
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+ fi
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+ ]) dnl check for extra options.
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+
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+ if test "$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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+
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+]) dnl end defun
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+
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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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