acinclude.m4 6.9 KB

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