acinclude.m4

   1 dnl $Id$
   2 dnl Helper macros for Tor configure.in
   3 dnl Copyright (c) 2001-2004, Roger Dingledine
   4 dnl Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson
   5 dnl Copyright (c) 2007-2008, Roger Dingledine, Nick Mathewson
   6 dnl See LICENSE for licensing information
   7
   8 AC_DEFUN([TOR_EXTEND_CODEPATH],
   9 [
  10   if test -d "$1/lib"; then
  11     LDFLAGS="-L$1/lib $LDFLAGS"
  12   else
  13     LDFLAGS="-L$1 $LDFLAGS"
  14   fi
  15   if test -d "$1/include"; then
  16     CPPFLAGS="-I$1/include $CPPFLAGS"
  17   else
  18     CPPFLAGS="-I$1 $CPPFLAGS"
  19   fi
  20 ])
  21
  22 AC_DEFUN([TOR_DEFINE_CODEPATH],
  23 [
  24   if test x$1 = "x(system)"; then
  25     TOR_LDFLAGS_$2=""
  26     TOR_CPPFLAGS_$2=""
  27   else
  28    if test -d "$1/lib"; then
  29      TOR_LDFLAGS_$2="-L$1/lib"
  30      TOR_LIBDIR_$2="$1/lib"
  31    else
  32      TOR_LDFLAGS_$2="-L$1"
  33      TOR_LIBDIR_$2="$1"
  34    fi
  35    if test -d "$1/include"; then
  36      TOR_CPPFLAGS_$2="-I$1/include"
  37    else
  38      TOR_CPPFLAGS_$2="-I$1"
  39    fi
  40   fi
  41   AC_SUBST(TOR_CPPFLAGS_$2)
  42   AC_SUBST(TOR_LDFLAGS_$2)
  43 ])
  44
  45 dnl 1:libname
  46 AC_DEFUN([TOR_WARN_MISSING_LIB], [
  47 h=""
  48 if test x$2 = xdevpkg; then
  49   h=" headers for"
  50 fi
  51 if test -f /etc/debian_version && test x"$tor_$1_$2_debian" != x; then
  52   AC_WARN([On Debian, you can install$h $1 using "apt-get install $tor_$1_$2_debian"])
  53   if test x"$tor_$1_$2_debian" != x"$tor_$1_devpkg_debian"; then
  54     AC_WARN([   You will probably need $tor_$1_devpkg_debian too.])
  55   fi
  56 fi
  57 if test -f /etc/fedora-release && test x"$tor_$1_$2_redhat" != x; then
  58   AC_WARN([On Fedora Core, you can install$h $1 using "yum install $tor_$1_$2_redhat"])
  59   if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
  60     AC_WARN([   You will probably need to install $tor_$1_devpkg_redhat too.])
  61   fi
  62 else
  63   if test -f /etc/redhat-release && test x"$tor_$1_$2_redhat" != x; then
  64     AC_WARN([On most Redhat-based systems, you can get$h $1 by installing the $tor_$1_$2_redhat" RPM package])
  65     if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
  66       AC_WARN([   You will probably need to install $tor_$1_devpkg_redhat too.])
  67     fi
  68   fi
  69 fi
  70 ])
  71
  72 dnl Look for a library, and its associated includes, and how to link
  73 dnl against it.
  74 dnl
  75 dnl TOR_SEARCH_LIBRARY(1:libname, 2:IGNORED, 3:linkargs, 4:headers,
  76 dnl                    5:prototype,
  77 dnl                    6:code, 7:IGNORED, 8:searchextra)
  78 dnl
  79 dnl Special variables:
  80 dnl   ALT_{libname}_WITHVAL -- another possible value for --with-$1-dir.
  81 dnl       Used to support renaming --with-ssl-dir to --with-openssl-dir
  82 dnl
  83 AC_DEFUN([TOR_SEARCH_LIBRARY], [
  84 try$1dir=""
  85 AC_ARG_WITH($1-dir,
  86   [  --with-$1-dir=PATH    Specify path to $1 installation ],
  87   [
  88      if test x$withval != xno ; then
  89         try$1dir="$withval"
  90      fi
  91   ])
  92 if test "x$try$1dir" = x && test "x$ALT_$1_WITHVAL" != x ; then
  93   try$1dir="$ALT_$1_WITHVAL"
  94 fi
  95
  96 tor_saved_LIBS="$LIBS"
  97 tor_saved_LDFLAGS="$LDFLAGS"
  98 tor_saved_CPPFLAGS="$CPPFLAGS"
  99 AC_CACHE_CHECK([for $1 directory], tor_cv_library_$1_dir, [
 100   tor_$1_dir_found=no
 101   tor_$1_any_linkable=no
 102
 103   for tor_trydir in "$try$1dir" "(system)" "$prefix" /usr/local /usr/pkg $8; do
 104     LDFLAGS="$tor_saved_LDFLAGS"
 105     LIBS="$tor_saved_LIBS $3"
 106     CPPFLAGS="$tor_saved_CPPFLAGS"
 107
 108     if test -z "$tor_trydir" ; then
 109       continue;
 110     fi
 111
 112     # Skip the directory if it isn't there.
 113     if test ! -d "$tor_trydir" && test "$tor_trydir" != "(system)"; then
 114       continue;
 115     fi
 116
 117     # If this isn't blank, try adding the directory (or appropriate
 118     # include/libs subdirectories) to the command line.
 119     if test "$tor_trydir" != "(system)"; then
 120       TOR_EXTEND_CODEPATH($tor_trydir)
 121     fi
 122
 123     # Can we link against (but not necessarily run, or find the headers for)
 124     # the binary?
 125     AC_LINK_IFELSE(AC_LANG_PROGRAM([$5], [$6]),
 126                    [linkable=yes], [linkable=no])
 127
 128     if test "$linkable" = yes; then
 129       tor_$1_any_linkable=yes
 130       # Okay, we can link against it.  Can we find the headers?
 131       AC_COMPILE_IFELSE(AC_LANG_PROGRAM([$4], [$6]),
 132                         [buildable=yes], [buildable=no])
 133       if test "$buildable" = yes; then
 134          tor_cv_library_$1_dir=$tor_trydir
 135          tor_$1_dir_found=yes
 136          break
 137       fi
 138     fi
 139   done
 140
 141   if test "$tor_$1_dir_found" = no; then
 142     if test "$tor_$1_any_linkable" = no ; then
 143       AC_MSG_WARN([Could not find a linkable $1.  If you have it installed somewhere unusual, you can specify an explicit path using --with-$1-dir])
 144       TOR_WARN_MISSING_LIB($1, pkg)
 145       AC_MSG_ERROR([Missing libraries; unable to proceed.])
 146     else
 147       AC_MSG_WARN([We found the libraries for $1, but we could not find the C header files.  You may need to install a devel package.])
 148       TOR_WARN_MISSING_LIB($1, devpkg)
 149       AC_MSG_ERROR([Missing headers; unable to proceed.])
 150     fi
 151   fi
 152
 153   LDFLAGS="$tor_saved_LDFLAGS"
 154   LIBS="$tor_saved_LIBS"
 155   CPPFLAGS="$tor_saved_CPPFLAGS"
 156 ]) dnl end cache check
 157
 158 LIBS="$LIBS $3"
 159 if test "$tor_cv_library_$1_dir" != "(system)"; then
 160    TOR_EXTEND_CODEPATH($tor_cv_library_$1_dir)
 161 fi
 162
 163 TOR_DEFINE_CODEPATH($tor_cv_library_$1_dir, $1)
 164
 165 if test "$cross_compiling" != yes; then
 166   AC_CACHE_CHECK([whether we need extra options to link $1],
 167                  tor_cv_library_$1_linker_option, [
 168    orig_LDFLAGS="$LDFLAGS"
 169    runs=no
 170    linked_with=nothing
 171    if test -d "$tor_cv_library_$1_dir/lib"; then
 172      tor_trydir="$tor_cv_library_$1_dir/lib"
 173    else
 174      tor_trydir="$tor_cv_library_$1_dir"
 175    fi
 176    for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
 177                        "-Wl,-rpath,$tor_trydir" ; do
 178      if test "$tor_tryextra" = "(none)"; then
 179        LDFLAGS="$orig_LDFLAGS"
 180      else
 181        LDFLAGS="$tor_tryextra $orig_LDFLAGS"
 182      fi
 183      AC_RUN_IFELSE(AC_LANG_PROGRAM([$5], [$6]),
 184                    [runnable=yes], [runnable=no])
 185      if test "$runnable" = yes; then
 186         tor_cv_library_$1_linker_option=$tor_tryextra
 187         break
 188      fi
 189    done
 190
 191    if test "$runnable" = no; then
 192      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 --with-$1-dir}])
 193    fi
 194    LDFLAGS="$orig_LDFLAGS"
 195   ]) dnl end cache check check for extra options.
 196
 197   if test "$tor_cv_library_$1_linker_option" != "(none)" ; then
 198     TOR_LDFLAGS_$1="$TOR_LDFLAGS_$1 $tor_cv_library_$1_linker_option"
 199   fi
 200 fi # cross-compile
 201
 202 LIBS="$tor_saved_LIBS"
 203 LDFLAGS="$tor_saved_LDFLAGS"
 204 CPPFLAGS="$tor_saved_CPPFLAGS"
 205
 206 ]) dnl end defun
 207
 208 dnl Check whether the prototype for a function is present or missing.
 209 dnl Apple has a nasty habit of putting functions in their libraries (so that
 210 dnl AC_CHECK_FUNCS passes) but not actually declaring them in the headers.
 211 dnl
 212 dnl TOR_CHECK_PROTYPE(1:functionname, 2:macroname, 2: includes)
 213 AC_DEFUN([TOR_CHECK_PROTOTYPE], [
 214  AC_CACHE_CHECK([for declaration of $1], tor_cv_$1_declared, [
 215    AC_COMPILE_IFELSE(AC_LANG_PROGRAM([$3],[void *ptr= $1 ;]),
 216                      tor_cv_$1_declared=yes,tor_cv_$1_declared=no)])
 217 if test x$tor_cv_$1_declared != xno ; then
 218   AC_DEFINE($2, 1,
 219        [Defined if the prototype for $1 seems to be present.])
 220 fi
 221 ])