acinclude.m4 5.4 KB

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  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. 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. else
  28. TOR_LDFLAGS_$2="-L$1"
  29. fi
  30. if test -d "$1/include"; then
  31. TOR_CPPFLAGS_$2="-I$1/include"
  32. else
  33. TOR_CPPFLAGS_$2="-I$1"
  34. fi
  35. fi
  36. AC_SUBST(TOR_CPPFLAGS_$2)
  37. AC_SUBST(TOR_LDFLAGS_$2)
  38. ])
  39. dnl 1:libname
  40. AC_DEFUN([TOR_WARN_MISSING_LIB], [
  41. h=""
  42. if test x$2 = xdevpkg; then
  43. h=" headers for"
  44. fi
  45. if test -f /etc/debian_version -a x"$tor_$1_$2_debian" != x; then
  46. AC_WARN([On Debian, you can install$h $1 using "apt-get install $tor_$1_$2_debian"])
  47. fi
  48. if test -f /etc/fedora-release -a x"$tor_$1_$2_redhat" != x; then
  49. AC_WARN([On Fedora Core, you can install$h $1 using "yum install $tor_$1_$2_redhat"])
  50. else
  51. if test -f /etc/redhat-release -a x"$tor_$1_$2_redhat" != x; then
  52. AC_WARN([On most Redhat-based systems, you can get$h $1 by installing the $tor_$1_$2_redhat" RPM package])
  53. fi
  54. fi
  55. ])
  56. dnl Look for a library, and its associated includes, and how to link
  57. dnl against it.
  58. dnl
  59. dnl TOR_SEARCH_LIBRARY(1:libname, 2:IGNORED, 3:linkargs, 4:headers,
  60. dnl 5:prototype,
  61. dnl 6:code, 7:optionname, 8:searchextra)
  62. AC_DEFUN([TOR_SEARCH_LIBRARY], [
  63. try$1dir=""
  64. AC_ARG_WITH($1-dir,
  65. [ --with-$1-dir=PATH Specify path to $1 installation ],
  66. [
  67. if test x$withval != xno ; then
  68. try$1dir="$withval"
  69. fi
  70. ])
  71. tor_saved_LIBS="$LIBS"
  72. tor_saved_LDFLAGS="$LDFLAGS"
  73. tor_saved_CPPFLAGS="$CPPFLAGS"
  74. AC_CACHE_CHECK([for $1 directory], tor_cv_library_$1_dir, [
  75. tor_$1_dir_found=no
  76. tor_$1_any_linkable=no
  77. for tor_trydir in "$try$1dir" "(system)" "$prefix" /usr/local /usr/pkg $8; do
  78. LDFLAGS="$tor_saved_LDFLAGS"
  79. LIBS="$tor_saved_LIBS $3"
  80. CPPFLAGS="$tor_saved_CPPFLAGS"
  81. if test -z "$tor_trydir" ; then
  82. continue;
  83. fi
  84. # Skip the directory if it isn't there.
  85. if test ! -d "$tor_trydir" -a "$tor_trydir" != "(system)"; then
  86. continue;
  87. fi
  88. # If this isn't blank, try adding the directory (or appropriate
  89. # include/libs subdirectories) to the command line.
  90. if test "$tor_trydir" != "(system)"; then
  91. TOR_EXTEND_CODEPATH($tor_trydir)
  92. fi
  93. # Can we link against (but not necessarily run, or find the headers for)
  94. # the binary?
  95. AC_LINK_IFELSE(AC_LANG_PROGRAM([$5], [$6]),
  96. [linkable=yes], [linkable=no])
  97. if test $linkable = yes; then
  98. tor_$1_any_linkable=yes
  99. # Okay, we can link against it. Can we find the headers?
  100. AC_COMPILE_IFELSE(AC_LANG_PROGRAM([$4], [$6]),
  101. [buildable=yes], [buildable=no])
  102. if test $buildable = yes; then
  103. tor_cv_library_$1_dir=$tor_trydir
  104. tor_$1_dir_found=yes
  105. break
  106. fi
  107. fi
  108. done
  109. if test $tor_$1_dir_found = no; then
  110. if test $tor_$1_any_linkable = no ; then
  111. AC_MSG_WARN([Could not find a linkable $1. If you have it installed somewhere unusal, you can specify an explicit path using $7])
  112. TOR_WARN_MISSING_LIB($1, pkg)
  113. AC_MSG_ERROR([Missing libraries; unable to proceed.])
  114. else
  115. 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.])
  116. TOR_WARN_MISSING_LIB($1, devpkg)
  117. AC_MSG_ERROR([Missing headers; unable to proceed.])
  118. fi
  119. fi
  120. LDFLAGS="$tor_saved_LDFLAGS"
  121. LIBS="$tor_saved_LIBS"
  122. CPPFLAGS="$tor_saved_CPPFLAGS"
  123. ]) dnl end cache check
  124. LIBS="$LIBS $3"
  125. if test $tor_cv_library_$1_dir != "(system)"; then
  126. TOR_EXTEND_CODEPATH($tor_cv_library_$1_dir)
  127. fi
  128. TOR_DEFINE_CODEPATH($tor_cv_library_$1_dir, $1)
  129. if test -z "$CROSS_COMPILE"; then
  130. AC_CACHE_CHECK([whether we need extra options to link $1],
  131. tor_cv_library_$1_linker_option, [
  132. tor_saved_LDFLAGS="$LDFLAGS"
  133. runs=no
  134. linked_with=nothing
  135. if test -d "$tor_cv_library_$1_dir/lib"; then
  136. tor_trydir="$tor_cv_library_$1_dir/lib"
  137. else
  138. tor_trydir="$tor_cv_library_$1_dir"
  139. fi
  140. for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
  141. "-Wl,-rpath,$tor_trydir" ; do
  142. if test "$tor_tryextra" = "(none)"; then
  143. LDFLAGS="$tor_saved_LDFLAGS"
  144. else
  145. LDFLAGS="$tor_tryextra $tor_saved_LDFLAGS"
  146. fi
  147. AC_RUN_IFELSE(AC_LANG_PROGRAM([$5], [$6]),
  148. [runnable=yes], [runnable=no])
  149. if test "$runnable" = yes; then
  150. tor_cv_library_$1_linker_option=$tor_tryextra
  151. break
  152. fi
  153. done
  154. if test "$runnable" = no; then
  155. 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 $7}])
  156. fi
  157. LDFLAGS="$tor_saved_LDFLAGS"
  158. ]) dnl end cache check check for extra options.
  159. if test "$tor_cv_library_$1_linker_option" != "(none)" ; then
  160. TOR_LDFLAGS_$1="$tor_cv_library_$1_linker_option"
  161. fi
  162. fi # cross-compile
  163. LIBS="$tor_saved_LIBS"
  164. LDFLAGS="$tor_saved_LDFLAGS"
  165. CPPFLAGS="$TOR_CPPFLAGS_$1 $tor_saved_CPPFLAGS"
  166. ]) dnl end defun