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