acinclude.m4

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