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 Copyright (c) 2007-2012, The Tor Project, Inc.
   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:flags
  46 AC_DEFUN([TOR_CHECK_CFLAGS], [
  47   AS_VAR_PUSHDEF([VAR],[tor_cv_cflags_$1])
  48   AC_CACHE_CHECK([whether the compiler accepts $1], VAR, [
  49     tor_saved_CFLAGS="$CFLAGS"
  50     CFLAGS="$CFLAGS -pedantic -Werror $1"
  51     AC_TRY_COMPILE([], [return 0;],
  52                    [AS_VAR_SET(VAR,yes)],
  53                    [AS_VAR_SET(VAR,no)])
  54     CFLAGS="$tor_saved_CFLAGS"
  55   ])
  56   if test x$VAR = xyes; then
  57     CFLAGS="$CFLAGS $1"
  58   fi
  59   AS_VAR_POPDEF([VAR])
  60 ])
  61
  62 dnl 1:flags
  63 dnl 2:extra ldflags
  64 dnl 3:extra libraries
  65 AC_DEFUN([TOR_CHECK_LDFLAGS], [
  66   AS_VAR_PUSHDEF([VAR],[tor_cv_ldflags_$1])
  67   AC_CACHE_CHECK([whether the linker accepts $1], VAR, [
  68     tor_saved_CFLAGS="$CFLAGS"
  69     tor_saved_LDFLAGS="$LDFLAGS"
  70     tor_saved_LIBS="$LIBS"
  71     CFLAGS="$CFLAGS -pedantic -Werror"
  72     LDFLAGS="$LDFLAGS $2 $1"
  73     LIBS="$LIBS $3"
  74     AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [fputs("", stdout)])],
  75                   [AS_VAR_SET(VAR,yes)],
  76                   [AS_VAR_SET(VAR,no)],
  77                   [AC_TRY_LINK([], [return 0;],
  78                                    [AS_VAR_SET(VAR,yes)],
  79                                    [AS_VAR_SET(VAR,no)])])
  80     CFLAGS="$tor_saved_CFLAGS"
  81     LDFLAGS="$tor_saved_LDFLAGS"
  82     LIBS="$tor_saved_LIBS"
  83   ])
  84   if test x$VAR = xyes; then
  85     LDFLAGS="$LDFLAGS $1"
  86   fi
  87   AS_VAR_POPDEF([VAR])
  88 ])
  89
  90 dnl 1:libname
  91 AC_DEFUN([TOR_WARN_MISSING_LIB], [
  92 h=""
  93 if test x$2 = xdevpkg; then
  94   h=" headers for"
  95 fi
  96 if test -f /etc/debian_version && test x"$tor_$1_$2_debian" != x; then
  97   AC_WARN([On Debian, you can install$h $1 using "apt-get install $tor_$1_$2_debian"])
  98   if test x"$tor_$1_$2_debian" != x"$tor_$1_devpkg_debian"; then
  99     AC_WARN([   You will probably need $tor_$1_devpkg_debian too.])
 100   fi
 101 fi
 102 if test -f /etc/fedora-release && test x"$tor_$1_$2_redhat" != x; then
 103   AC_WARN([On Fedora Core, you can install$h $1 using "yum install $tor_$1_$2_redhat"])
 104   if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
 105     AC_WARN([   You will probably need to install $tor_$1_devpkg_redhat too.])
 106   fi
 107 else
 108   if test -f /etc/redhat-release && test x"$tor_$1_$2_redhat" != x; then
 109     AC_WARN([On most Redhat-based systems, you can get$h $1 by installing the $tor_$1_$2_redhat" RPM package])
 110     if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
 111       AC_WARN([   You will probably need to install $tor_$1_devpkg_redhat too.])
 112     fi
 113   fi
 114 fi
 115 ])
 116
 117 dnl Look for a library, and its associated includes, and how to link
 118 dnl against it.
 119 dnl
 120 dnl TOR_SEARCH_LIBRARY(1:libname, 2:IGNORED, 3:linkargs, 4:headers,
 121 dnl                    5:prototype,
 122 dnl                    6:code, 7:IGNORED, 8:searchextra)
 123 dnl
 124 dnl Special variables:
 125 dnl   ALT_{libname}_WITHVAL -- another possible value for --with-$1-dir.
 126 dnl       Used to support renaming --with-ssl-dir to --with-openssl-dir
 127 dnl
 128 AC_DEFUN([TOR_SEARCH_LIBRARY], [
 129 try$1dir=""
 130 AC_ARG_WITH($1-dir,
 131   [  --with-$1-dir=PATH    Specify path to $1 installation ],
 132   [
 133      if test x$withval != xno ; then
 134         try$1dir="$withval"
 135      fi
 136   ])
 137 if test "x$try$1dir" = x && test "x$ALT_$1_WITHVAL" != x ; then
 138   try$1dir="$ALT_$1_WITHVAL"
 139 fi
 140
 141 tor_saved_LIBS="$LIBS"
 142 tor_saved_LDFLAGS="$LDFLAGS"
 143 tor_saved_CPPFLAGS="$CPPFLAGS"
 144 AC_CACHE_CHECK([for $1 directory], tor_cv_library_$1_dir, [
 145   tor_$1_dir_found=no
 146   tor_$1_any_linkable=no
 147
 148   for tor_trydir in "$try$1dir" "(system)" "$prefix" /usr/local /usr/pkg $8; do
 149     LDFLAGS="$tor_saved_LDFLAGS"
 150     LIBS="$tor_saved_LIBS $3"
 151     CPPFLAGS="$tor_saved_CPPFLAGS"
 152
 153     if test -z "$tor_trydir" ; then
 154       continue;
 155     fi
 156
 157     # Skip the directory if it isn't there.
 158     if test ! -d "$tor_trydir" && test "$tor_trydir" != "(system)"; then
 159       continue;
 160     fi
 161
 162     # If this isn't blank, try adding the directory (or appropriate
 163     # include/libs subdirectories) to the command line.
 164     if test "$tor_trydir" != "(system)"; then
 165       TOR_EXTEND_CODEPATH($tor_trydir)
 166     fi
 167
 168     # Can we link against (but not necessarily run, or find the headers for)
 169     # the binary?
 170     AC_LINK_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
 171                    [linkable=yes], [linkable=no])
 172
 173     if test "$linkable" = yes; then
 174       tor_$1_any_linkable=yes
 175       # Okay, we can link against it.  Can we find the headers?
 176       AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$4], [$6])],
 177                         [buildable=yes], [buildable=no])
 178       if test "$buildable" = yes; then
 179          tor_cv_library_$1_dir=$tor_trydir
 180          tor_$1_dir_found=yes
 181          break
 182       fi
 183     fi
 184   done
 185
 186   if test "$tor_$1_dir_found" = no; then
 187     if test "$tor_$1_any_linkable" = no ; then
 188       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])
 189       TOR_WARN_MISSING_LIB($1, pkg)
 190       AC_MSG_ERROR([Missing libraries; unable to proceed.])
 191     else
 192       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.])
 193       TOR_WARN_MISSING_LIB($1, devpkg)
 194       AC_MSG_ERROR([Missing headers; unable to proceed.])
 195     fi
 196   fi
 197
 198   LDFLAGS="$tor_saved_LDFLAGS"
 199   LIBS="$tor_saved_LIBS"
 200   CPPFLAGS="$tor_saved_CPPFLAGS"
 201 ]) dnl end cache check
 202
 203 LIBS="$LIBS $3"
 204 if test "$tor_cv_library_$1_dir" != "(system)"; then
 205    TOR_EXTEND_CODEPATH($tor_cv_library_$1_dir)
 206 fi
 207
 208 TOR_DEFINE_CODEPATH($tor_cv_library_$1_dir, $1)
 209
 210 if test "$cross_compiling" != yes; then
 211   AC_CACHE_CHECK([whether we need extra options to link $1],
 212                  tor_cv_library_$1_linker_option, [
 213    orig_LDFLAGS="$LDFLAGS"
 214    runs=no
 215    linked_with=nothing
 216    if test -d "$tor_cv_library_$1_dir/lib"; then
 217      tor_trydir="$tor_cv_library_$1_dir/lib"
 218    else
 219      tor_trydir="$tor_cv_library_$1_dir"
 220    fi
 221    for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
 222                        "-Wl,-rpath,$tor_trydir" ; do
 223      if test "$tor_tryextra" = "(none)"; then
 224        LDFLAGS="$orig_LDFLAGS"
 225      else
 226        LDFLAGS="$tor_tryextra $orig_LDFLAGS"
 227      fi
 228      AC_RUN_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
 229                    [runnable=yes], [runnable=no])
 230      if test "$runnable" = yes; then
 231         tor_cv_library_$1_linker_option=$tor_tryextra
 232         break
 233      fi
 234    done
 235
 236    if test "$runnable" = no; then
 237      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-$1-dir}])
 238    fi
 239    LDFLAGS="$orig_LDFLAGS"
 240   ]) dnl end cache check check for extra options.
 241
 242   if test "$tor_cv_library_$1_linker_option" != "(none)" ; then
 243     TOR_LDFLAGS_$1="$TOR_LDFLAGS_$1 $tor_cv_library_$1_linker_option"
 244   fi
 245 fi # cross-compile
 246
 247 LIBS="$tor_saved_LIBS"
 248 LDFLAGS="$tor_saved_LDFLAGS"
 249 CPPFLAGS="$tor_saved_CPPFLAGS"
 250
 251 ]) dnl end defun
 252
 253 dnl Check whether the prototype for a function is present or missing.
 254 dnl Apple has a nasty habit of putting functions in their libraries (so that
 255 dnl AC_CHECK_FUNCS passes) but not actually declaring them in the headers.
 256 dnl
 257 dnl TOR_CHECK_PROTYPE(1:functionname, 2:macroname, 2: includes)
 258 AC_DEFUN([TOR_CHECK_PROTOTYPE], [
 259  AC_CACHE_CHECK([for declaration of $1], tor_cv_$1_declared, [
 260    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$3],[void *ptr= $1 ;])],
 261                      tor_cv_$1_declared=yes,tor_cv_$1_declared=no)])
 262 if test x$tor_cv_$1_declared != xno ; then
 263   AC_DEFINE($2, 1,
 264        [Defined if the prototype for $1 seems to be present.])
 265 fi
 266 ])