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dnl $Id$
dnl Helper macros for Tor configure.in
dnl Copyright (c) 2001-2004, Roger Dingledine
dnl Copyright (c) 2004-2007, Roger Dingledine, Nick Mathewson
dnl See LICENSE for licensing information
dnl TODO
dnl - Stop requiring gethostbyname_r entirely when we're building with
dnl eventdns?
dnl - Remove redundant event.h check.
dnl - Make the "no longe strictly accurate" message accurate.
dnl - Tell the user what -dev package to install based on OS.
dnl - Detect correct version of library.
dnl - After merge:
dnl Run autoupdate
AC_DEFUN([TOR_EXTEND_CODEPATH],
[
if test -d "$1/lib"; then
LDFLAGS="-L$1/lib $LDFLAGS"
else
LDFLAGS="-L$1 $LDFLAGS"
fi
if test -d "$1/include"; then
CPPFLAGS="-I$1/include $CPPFLAGS"
else
CPPFLAGS="-I$1 $CPPFLAGS"
fi
])
dnl Look for a library, and its associated includes, and how to link
dnl against it.
dnl
dnl TOR_SEARCH_LIBRARY(libname, withlocation, linkargs, headers, prototype,
dnl code, optionname, searchextra)
AC_DEFUN([TOR_SEARCH_LIBRARY], [
tor_saved_LIBS="$LIBS"
tor_saved_LDFLAGS="$LDFLAGS"
tor_saved_CPPFLAGS="$CPPFLAGS"
AC_CACHE_CHECK([for $1 directory], tor_cv_library_$1_dir, [
tor_$1_dir_found=no
tor_$1_any_linkable=no
for tor_trydir in "$2" "(system)" "$prefix" /usr/local /usr/pkg $8; do
LDFLAGS="$tor_saved_LDFLAGS"
LIBS="$tor_saved_LIBS $3"
CPPFLAGS="$tor_saved_CPPFLAGS"
if test -z "$tor_trydir" ; then
continue;
fi
# Skip the directory if it isn't there.
if test ! -d "$tor_trydir" -a "$tor_trydir" != "(system)"; then
continue;
fi
# If this isn't blank, try adding the directory (or appropriate
# include/libs subdirectories) to the command line.
if test "$tor_trydir" != "(system)"; then
TOR_EXTEND_CODEPATH($tor_trydir)
fi
# Can we link against (but not necessarily compile) the binary?
AC_LINK_IFELSE(AC_LANG_PROGRAM([$5], [$6]),
[linkable=yes], [linkable=no])
if test $linkable = yes; then
tor_$1_any_linkable=yes
AC_COMPILE_IFELSE(AC_LANG_PROGRAM([$4], [$6]),
[buildable=yes], [buildable=no])
if test $buildable = yes; then
tor_cv_library_$1_dir=$tor_trydir
tor_$1_dir_found=yes
break
fi
fi
done
if test $tor_$1_dir_found = no; then
if test $tor_$1_any_linkable = no ; then
AC_MSG_ERROR([Could not find a linkable $1. You can specify an explicit path using $7])
else
AC_MSG_ERROR([We found the libraries for $1, but we could not find the C header files. You may need to install a devel package.])
fi
fi
LDFLAGS="$tor_saved_LDFLAGS"
LIBS="$tor_saved_LIBS $3"
CPPFLAGS="$tor_saved_CPPFLAGS"
]) dnl end cache check
LIBS="$LIBS $3"
if test $tor_cv_library_$1_dir != "(system)"; then
TOR_EXTEND_CODEPATH($tor_cv_library_$1_dir)
fi
if test -z "$CROSS_COMPILE"; then
AC_CACHE_CHECK([whether we need extra options to link $1],
tor_cv_library_$1_linker_option, [
tor_saved_LDFLAGS="$LDFLAGS"
tor_trydir="$tor_cv_library_$1_dir"
runs=no
linked_with=nothing
for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
"-Wl,-rpath,$le_libdir" ; do
if test "$tor_tryextra" = "(none)"; then
LDFLAGS="$saved_LDFLAGS"
else
LDFLAGS="$tor_tryextra $saved_LDFLAGS"
fi
AC_RUN_IFELSE(AC_LANG_PROGRAM([$5], [$6]),
[runnable=yes], [runnable=no])
if test "$runnable" = yes; then
tor_cv_library_$1_linker_option=$tor_tryextra
break
fi
done
if test "$runnable" = no; then
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 $7}])
fi
]) dnl check for extra options.
if test "$tor_cv_library_$1_linker_option" != "(none)" ; then
LDFLAGS="$tor_cv_library_$1_linker_option $LDFLAGS"
fi
fi # cross-compile
]) dnl end defun
#XXXX Check for right version
#XXXX accept list of search paths as options
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