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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
- 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 $CPPFLAGS"
- fi
- ])
- dnl Look for a library, and its associated includes, and how to link
- dnl against it.
- dnl
- dnl TOR_SEARCH_LIBRARY(1:libname, 2:withlocation, 3:linkargs, 4:headers,
- dnl 5:prototype,
- dnl 6:code, 7:optionname, 8:searchextra)
- AC_DEFUN([TOR_SEARCH_LIBRARY], [
- tor_saved_LIBS="$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 run, or find the headers for)
- # the binary?
- AC_LINK_IFELSE(AC_LANG_PROGRAM([$5], [$6]),
- [linkable=yes], [linkable=no])
- if test $linkable = yes; then
- tor_$1_any_linkable=yes
- # Okay, we can link against it. Can we find the headers?
- 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="$tor_saved_LIBS"
- CPPFLAGS="$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"
- runs=no
- linked_with=nothing
- if test -d "$tor_cv_library_$1_dir/lib"; then
- tor_trydir="$tor_cv_library_$1_dir/lib"
- else
- tor_trydir="$tor_cv_library_$1_dir"
- fi
- for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
- "-Wl,-rpath,$tor_trydir" ; do
- if test "$tor_tryextra" = "(none)"; then
- LDFLAGS="$tor_saved_LDFLAGS"
- else
- LDFLAGS="$tor_tryextra $tor_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 $7}])
- fi
- LDFLAGS="$tor_saved_LDFLAGS"
- ]) dnl end cache check 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
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