acinclude.m4

   1 dnl Helper macros for Tor configure.ac
   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) 2007-2019, 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 dnl 2: try to link too if this is nonempty.
  47 dnl 3: what to do on success compiling
  48 dnl 4: what to do on failure compiling
  49 AC_DEFUN([TOR_TRY_COMPILE_WITH_CFLAGS], [
  50   AS_VAR_PUSHDEF([VAR],[tor_cv_cflags_$1])
  51   AC_CACHE_CHECK([whether the compiler accepts $1], VAR, [
  52     tor_saved_CFLAGS="$CFLAGS"
  53     CFLAGS="$CFLAGS -pedantic -Werror $1"
  54     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
  55                    [AS_VAR_SET(VAR,yes)],
  56                    [AS_VAR_SET(VAR,no)])
  57     if test x$2 != x; then
  58       AS_VAR_PUSHDEF([can_link],[tor_can_link_$1])
  59       AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
  60                   [AS_VAR_SET(can_link,yes)],
  61                   [AS_VAR_SET(can_link,no)])
  62       AS_VAR_POPDEF([can_link])
  63     fi
  64     CFLAGS="$tor_saved_CFLAGS"
  65   ])
  66   if test x$VAR = xyes; then
  67      $3
  68   else
  69      $4
  70   fi
  71   AS_VAR_POPDEF([VAR])
  72 ])
  73
  74 dnl 1:flags
  75 dnl 2:also try to link (yes: non-empty string)
  76 dnl   will set yes or no in $tor_can_link_$1 (as modified by AS_VAR_PUSHDEF)
  77 AC_DEFUN([TOR_CHECK_CFLAGS], [
  78   TOR_TRY_COMPILE_WITH_CFLAGS($1, $2, CFLAGS="$CFLAGS $1", true)
  79 ])
  80
  81 dnl 1:flags
  82 dnl 2:extra ldflags
  83 dnl 3:extra libraries
  84 AC_DEFUN([TOR_CHECK_LDFLAGS], [
  85   AS_VAR_PUSHDEF([VAR],[tor_cv_ldflags_$1])
  86   AC_CACHE_CHECK([whether the linker accepts $1], VAR, [
  87     tor_saved_CFLAGS="$CFLAGS"
  88     tor_saved_LDFLAGS="$LDFLAGS"
  89     tor_saved_LIBS="$LIBS"
  90     CFLAGS="$CFLAGS -pedantic -Werror"
  91     LDFLAGS="$LDFLAGS $2 $1"
  92     LIBS="$LIBS $3"
  93     AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [fputs("", stdout)])],
  94                   [AS_VAR_SET(VAR,yes)],
  95                   [AS_VAR_SET(VAR,no)],
  96                   [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
  97                                    [AS_VAR_SET(VAR,yes)],
  98                                    [AS_VAR_SET(VAR,no)])])
  99     CFLAGS="$tor_saved_CFLAGS"
 100     LDFLAGS="$tor_saved_LDFLAGS"
 101     LIBS="$tor_saved_LIBS"
 102   ])
 103   if test x$VAR = xyes; then
 104     LDFLAGS="$LDFLAGS $1"
 105   fi
 106   AS_VAR_POPDEF([VAR])
 107 ])
 108
 109 dnl 1:libname
 110 AC_DEFUN([TOR_WARN_MISSING_LIB], [
 111 h=""
 112 if test x$2 = xdevpkg; then
 113   h=" headers for"
 114 fi
 115 if test -f /etc/debian_version && test x"$tor_$1_$2_debian" != x; then
 116   AC_MSG_WARN([On Debian, you can install$h $1 using "apt-get install $tor_$1_$2_debian"])
 117   if test x"$tor_$1_$2_debian" != x"$tor_$1_devpkg_debian"; then
 118     AC_MSG_WARN([   You will probably need $tor_$1_devpkg_debian too.])
 119   fi
 120 fi
 121 if test -f /etc/fedora-release && test x"$tor_$1_$2_redhat" != x; then
 122   AC_MSG_WARN([On Fedora, you can install$h $1 using "dnf install $tor_$1_$2_redhat"])
 123   if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
 124     AC_MSG_WARN([   You will probably need to install $tor_$1_devpkg_redhat too.])
 125   fi
 126 else
 127   if test -f /etc/redhat-release && test x"$tor_$1_$2_redhat" != x; then
 128     AC_MSG_WARN([On most Redhat-based systems, you can get$h $1 by installing the $tor_$1_$2_redhat RPM package])
 129     if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
 130       AC_MSG_WARN([   You will probably need to install $tor_$1_devpkg_redhat too.])
 131     fi
 132   fi
 133 fi
 134 ])
 135
 136 dnl Look for a library, and its associated includes, and how to link
 137 dnl against it.
 138 dnl
 139 dnl TOR_SEARCH_LIBRARY(1:libname, 2:IGNORED, 3:linkargs, 4:headers,
 140 dnl                    5:prototype,
 141 dnl                    6:code, 7:IGNORED, 8:searchextra)
 142 dnl
 143 dnl Special variables:
 144 dnl   ALT_{libname}_WITHVAL -- another possible value for --with-$1-dir.
 145 dnl       Used to support renaming --with-ssl-dir to --with-openssl-dir
 146 dnl
 147 AC_DEFUN([TOR_SEARCH_LIBRARY], [
 148 try$1dir=""
 149 AC_ARG_WITH($1-dir,
 150   AS_HELP_STRING(--with-$1-dir=PATH, [specify path to $1 installation]),
 151   [
 152      if test x$withval != xno ; then
 153         try$1dir="$withval"
 154      fi
 155   ])
 156 if test "x$try$1dir" = x && test "x$ALT_$1_WITHVAL" != x ; then
 157   try$1dir="$ALT_$1_WITHVAL"
 158 fi
 159
 160 tor_saved_LIBS="$LIBS"
 161 tor_saved_LDFLAGS="$LDFLAGS"
 162 tor_saved_CPPFLAGS="$CPPFLAGS"
 163 AC_CACHE_CHECK([for $1 directory], tor_cv_library_$1_dir, [
 164   tor_$1_dir_found=no
 165   tor_$1_any_linkable=no
 166
 167   for tor_trydir in "$try$1dir" "(system)" "$prefix" /usr/local /usr/pkg $8; do
 168     LDFLAGS="$tor_saved_LDFLAGS"
 169     LIBS="$3 $tor_saved_LIBS"
 170     CPPFLAGS="$tor_saved_CPPFLAGS"
 171
 172     if test -z "$tor_trydir" ; then
 173       continue;
 174     fi
 175
 176     # Skip the directory if it isn't there.
 177     if test ! -d "$tor_trydir" && test "$tor_trydir" != "(system)"; then
 178       continue;
 179     fi
 180
 181     # If this isn't blank, try adding the directory (or appropriate
 182     # include/libs subdirectories) to the command line.
 183     if test "$tor_trydir" != "(system)"; then
 184       TOR_EXTEND_CODEPATH($tor_trydir)
 185     fi
 186
 187     # Can we link against (but not necessarily run, or find the headers for)
 188     # the binary?
 189     AC_LINK_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
 190                    [linkable=yes], [linkable=no])
 191
 192     if test "$linkable" = yes; then
 193       tor_$1_any_linkable=yes
 194       # Okay, we can link against it.  Can we find the headers?
 195       AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$4], [$6])],
 196                         [buildable=yes], [buildable=no])
 197       if test "$buildable" = yes; then
 198          tor_cv_library_$1_dir=$tor_trydir
 199          tor_$1_dir_found=yes
 200          break
 201       fi
 202     fi
 203   done
 204
 205   if test "$tor_$1_dir_found" = no; then
 206     if test "$tor_$1_any_linkable" = no ; then
 207       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])
 208       TOR_WARN_MISSING_LIB($1, pkg)
 209       AC_MSG_ERROR([Missing libraries; unable to proceed.])
 210     else
 211       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.])
 212       TOR_WARN_MISSING_LIB($1, devpkg)
 213       AC_MSG_ERROR([Missing headers; unable to proceed.])
 214     fi
 215   fi
 216
 217   LDFLAGS="$tor_saved_LDFLAGS"
 218   LIBS="$tor_saved_LIBS"
 219   CPPFLAGS="$tor_saved_CPPFLAGS"
 220 ]) dnl end cache check
 221
 222 LIBS="$3 $LIBS"
 223 if test "$tor_cv_library_$1_dir" != "(system)"; then
 224    TOR_EXTEND_CODEPATH($tor_cv_library_$1_dir)
 225 fi
 226
 227 TOR_DEFINE_CODEPATH($tor_cv_library_$1_dir, $1)
 228
 229 if test "$cross_compiling" != yes; then
 230   AC_CACHE_CHECK([whether we need extra options to link $1],
 231                  tor_cv_library_$1_linker_option, [
 232    orig_LDFLAGS="$LDFLAGS"
 233    runs=no
 234    linked_with=nothing
 235    if test -d "$tor_cv_library_$1_dir/lib"; then
 236      tor_trydir="$tor_cv_library_$1_dir/lib"
 237    else
 238      tor_trydir="$tor_cv_library_$1_dir"
 239    fi
 240    for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
 241                        "-Wl,-rpath,$tor_trydir" ; do
 242      if test "$tor_tryextra" = "(none)"; then
 243        LDFLAGS="$orig_LDFLAGS"
 244      else
 245        LDFLAGS="$tor_tryextra $orig_LDFLAGS"
 246      fi
 247      AC_RUN_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
 248                    [runnable=yes], [runnable=no],
 249                    [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
 250                                    [runnable=yes],
 251                                    [runnable=no])])
 252      if test "$runnable" = yes; then
 253         tor_cv_library_$1_linker_option=$tor_tryextra
 254         break
 255      fi
 256    done
 257
 258    if test "$runnable" = no; then
 259      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-$1-dir}])
 260    fi
 261    LDFLAGS="$orig_LDFLAGS"
 262   ]) dnl end cache check check for extra options.
 263
 264   if test "$tor_cv_library_$1_linker_option" != "(none)" ; then
 265     TOR_LDFLAGS_$1="$TOR_LDFLAGS_$1 $tor_cv_library_$1_linker_option"
 266   fi
 267 fi # cross-compile
 268
 269 LIBS="$tor_saved_LIBS"
 270 LDFLAGS="$tor_saved_LDFLAGS"
 271 CPPFLAGS="$tor_saved_CPPFLAGS"
 272
 273 ]) dnl end defun
 274
 275 dnl Check whether the prototype for a function is present or missing.
 276 dnl Apple has a nasty habit of putting functions in their libraries (so that
 277 dnl AC_CHECK_FUNCS passes) but not actually declaring them in the headers.
 278 dnl
 279 dnl TOR_CHECK_PROTYPE(1:functionname, 2:macroname, 2: includes)
 280 AC_DEFUN([TOR_CHECK_PROTOTYPE], [
 281  AC_CACHE_CHECK([for declaration of $1], tor_cv_$1_declared, [
 282    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$3],[void *ptr= $1 ;])],
 283                      tor_cv_$1_declared=yes,tor_cv_$1_declared=no)])
 284 if test x$tor_cv_$1_declared != xno ; then
 285   AC_DEFINE($2, 1,
 286        [Defined if the prototype for $1 seems to be present.])
 287 fi
 288 ])