acinclude.m4 8.6 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275
  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) 2007-2015, The Tor Project, Inc.
  6. dnl See LICENSE for licensing information
  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. AC_DEFUN([TOR_DEFINE_CODEPATH],
  21. [
  22. if test x$1 = "x(system)"; then
  23. TOR_LDFLAGS_$2=""
  24. TOR_CPPFLAGS_$2=""
  25. else
  26. if test -d "$1/lib"; then
  27. TOR_LDFLAGS_$2="-L$1/lib"
  28. TOR_LIBDIR_$2="$1/lib"
  29. else
  30. TOR_LDFLAGS_$2="-L$1"
  31. TOR_LIBDIR_$2="$1"
  32. fi
  33. if test -d "$1/include"; then
  34. TOR_CPPFLAGS_$2="-I$1/include"
  35. else
  36. TOR_CPPFLAGS_$2="-I$1"
  37. fi
  38. fi
  39. AC_SUBST(TOR_CPPFLAGS_$2)
  40. AC_SUBST(TOR_LDFLAGS_$2)
  41. ])
  42. dnl 1:flags
  43. dnl 2:also try to link (yes: non-empty string)
  44. dnl will set yes or no in $tor_can_link_$1 (as modified by AS_VAR_PUSHDEF)
  45. AC_DEFUN([TOR_CHECK_CFLAGS], [
  46. AS_VAR_PUSHDEF([VAR],[tor_cv_cflags_$1])
  47. AC_CACHE_CHECK([whether the compiler accepts $1], VAR, [
  48. tor_saved_CFLAGS="$CFLAGS"
  49. CFLAGS="$CFLAGS -pedantic -Werror $1"
  50. AC_TRY_COMPILE([], [return 0;],
  51. [AS_VAR_SET(VAR,yes)],
  52. [AS_VAR_SET(VAR,no)])
  53. if test x$2 != x; then
  54. AS_VAR_PUSHDEF([can_link],[tor_can_link_$1])
  55. AC_TRY_LINK([], [return 0;],
  56. [AS_VAR_SET(can_link,yes)],
  57. [AS_VAR_SET(can_link,no)])
  58. AS_VAR_POPDEF([can_link])
  59. fi
  60. CFLAGS="$tor_saved_CFLAGS"
  61. ])
  62. if test x$VAR = xyes; then
  63. CFLAGS="$CFLAGS $1"
  64. fi
  65. AS_VAR_POPDEF([VAR])
  66. ])
  67. dnl 1:flags
  68. dnl 2:extra ldflags
  69. dnl 3:extra libraries
  70. AC_DEFUN([TOR_CHECK_LDFLAGS], [
  71. AS_VAR_PUSHDEF([VAR],[tor_cv_ldflags_$1])
  72. AC_CACHE_CHECK([whether the linker accepts $1], VAR, [
  73. tor_saved_CFLAGS="$CFLAGS"
  74. tor_saved_LDFLAGS="$LDFLAGS"
  75. tor_saved_LIBS="$LIBS"
  76. CFLAGS="$CFLAGS -pedantic -Werror"
  77. LDFLAGS="$LDFLAGS $2 $1"
  78. LIBS="$LIBS $3"
  79. AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [fputs("", stdout)])],
  80. [AS_VAR_SET(VAR,yes)],
  81. [AS_VAR_SET(VAR,no)],
  82. [AC_TRY_LINK([], [return 0;],
  83. [AS_VAR_SET(VAR,yes)],
  84. [AS_VAR_SET(VAR,no)])])
  85. CFLAGS="$tor_saved_CFLAGS"
  86. LDFLAGS="$tor_saved_LDFLAGS"
  87. LIBS="$tor_saved_LIBS"
  88. ])
  89. if test x$VAR = xyes; then
  90. LDFLAGS="$LDFLAGS $1"
  91. fi
  92. AS_VAR_POPDEF([VAR])
  93. ])
  94. dnl 1:libname
  95. AC_DEFUN([TOR_WARN_MISSING_LIB], [
  96. h=""
  97. if test x$2 = xdevpkg; then
  98. h=" headers for"
  99. fi
  100. if test -f /etc/debian_version && test x"$tor_$1_$2_debian" != x; then
  101. AC_WARN([On Debian, you can install$h $1 using "apt-get install $tor_$1_$2_debian"])
  102. if test x"$tor_$1_$2_debian" != x"$tor_$1_devpkg_debian"; then
  103. AC_WARN([ You will probably need $tor_$1_devpkg_debian too.])
  104. fi
  105. fi
  106. if test -f /etc/fedora-release && test x"$tor_$1_$2_redhat" != x; then
  107. AC_WARN([On Fedora Core, you can install$h $1 using "yum install $tor_$1_$2_redhat"])
  108. if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
  109. AC_WARN([ You will probably need to install $tor_$1_devpkg_redhat too.])
  110. fi
  111. else
  112. if test -f /etc/redhat-release && test x"$tor_$1_$2_redhat" != x; then
  113. AC_WARN([On most Redhat-based systems, you can get$h $1 by installing the $tor_$1_$2_redhat RPM package])
  114. if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
  115. AC_WARN([ You will probably need to install $tor_$1_devpkg_redhat too.])
  116. fi
  117. fi
  118. fi
  119. ])
  120. dnl Look for a library, and its associated includes, and how to link
  121. dnl against it.
  122. dnl
  123. dnl TOR_SEARCH_LIBRARY(1:libname, 2:IGNORED, 3:linkargs, 4:headers,
  124. dnl 5:prototype,
  125. dnl 6:code, 7:IGNORED, 8:searchextra)
  126. dnl
  127. dnl Special variables:
  128. dnl ALT_{libname}_WITHVAL -- another possible value for --with-$1-dir.
  129. dnl Used to support renaming --with-ssl-dir to --with-openssl-dir
  130. dnl
  131. AC_DEFUN([TOR_SEARCH_LIBRARY], [
  132. try$1dir=""
  133. AC_ARG_WITH($1-dir,
  134. [ --with-$1-dir=PATH Specify path to $1 installation ],
  135. [
  136. if test x$withval != xno ; then
  137. try$1dir="$withval"
  138. fi
  139. ])
  140. if test "x$try$1dir" = x && test "x$ALT_$1_WITHVAL" != x ; then
  141. try$1dir="$ALT_$1_WITHVAL"
  142. fi
  143. tor_saved_LIBS="$LIBS"
  144. tor_saved_LDFLAGS="$LDFLAGS"
  145. tor_saved_CPPFLAGS="$CPPFLAGS"
  146. AC_CACHE_CHECK([for $1 directory], tor_cv_library_$1_dir, [
  147. tor_$1_dir_found=no
  148. tor_$1_any_linkable=no
  149. for tor_trydir in "$try$1dir" "(system)" "$prefix" /usr/local /usr/pkg $8; do
  150. LDFLAGS="$tor_saved_LDFLAGS"
  151. LIBS="$tor_saved_LIBS $3"
  152. CPPFLAGS="$tor_saved_CPPFLAGS"
  153. if test -z "$tor_trydir" ; then
  154. continue;
  155. fi
  156. # Skip the directory if it isn't there.
  157. if test ! -d "$tor_trydir" && test "$tor_trydir" != "(system)"; then
  158. continue;
  159. fi
  160. # If this isn't blank, try adding the directory (or appropriate
  161. # include/libs subdirectories) to the command line.
  162. if test "$tor_trydir" != "(system)"; then
  163. TOR_EXTEND_CODEPATH($tor_trydir)
  164. fi
  165. # Can we link against (but not necessarily run, or find the headers for)
  166. # the binary?
  167. AC_LINK_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
  168. [linkable=yes], [linkable=no])
  169. if test "$linkable" = yes; then
  170. tor_$1_any_linkable=yes
  171. # Okay, we can link against it. Can we find the headers?
  172. AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$4], [$6])],
  173. [buildable=yes], [buildable=no])
  174. if test "$buildable" = yes; then
  175. tor_cv_library_$1_dir=$tor_trydir
  176. tor_$1_dir_found=yes
  177. break
  178. fi
  179. fi
  180. done
  181. if test "$tor_$1_dir_found" = no; then
  182. if test "$tor_$1_any_linkable" = no ; then
  183. 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])
  184. TOR_WARN_MISSING_LIB($1, pkg)
  185. AC_MSG_ERROR([Missing libraries; unable to proceed.])
  186. else
  187. 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.])
  188. TOR_WARN_MISSING_LIB($1, devpkg)
  189. AC_MSG_ERROR([Missing headers; unable to proceed.])
  190. fi
  191. fi
  192. LDFLAGS="$tor_saved_LDFLAGS"
  193. LIBS="$tor_saved_LIBS"
  194. CPPFLAGS="$tor_saved_CPPFLAGS"
  195. ]) dnl end cache check
  196. LIBS="$LIBS $3"
  197. if test "$tor_cv_library_$1_dir" != "(system)"; then
  198. TOR_EXTEND_CODEPATH($tor_cv_library_$1_dir)
  199. fi
  200. TOR_DEFINE_CODEPATH($tor_cv_library_$1_dir, $1)
  201. if test "$cross_compiling" != yes; then
  202. AC_CACHE_CHECK([whether we need extra options to link $1],
  203. tor_cv_library_$1_linker_option, [
  204. orig_LDFLAGS="$LDFLAGS"
  205. runs=no
  206. linked_with=nothing
  207. if test -d "$tor_cv_library_$1_dir/lib"; then
  208. tor_trydir="$tor_cv_library_$1_dir/lib"
  209. else
  210. tor_trydir="$tor_cv_library_$1_dir"
  211. fi
  212. for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
  213. "-Wl,-rpath,$tor_trydir" ; do
  214. if test "$tor_tryextra" = "(none)"; then
  215. LDFLAGS="$orig_LDFLAGS"
  216. else
  217. LDFLAGS="$tor_tryextra $orig_LDFLAGS"
  218. fi
  219. AC_RUN_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
  220. [runnable=yes], [runnable=no])
  221. if test "$runnable" = yes; then
  222. tor_cv_library_$1_linker_option=$tor_tryextra
  223. break
  224. fi
  225. done
  226. if test "$runnable" = no; then
  227. 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-$1-dir}])
  228. fi
  229. LDFLAGS="$orig_LDFLAGS"
  230. ]) dnl end cache check check for extra options.
  231. if test "$tor_cv_library_$1_linker_option" != "(none)" ; then
  232. TOR_LDFLAGS_$1="$TOR_LDFLAGS_$1 $tor_cv_library_$1_linker_option"
  233. fi
  234. fi # cross-compile
  235. LIBS="$tor_saved_LIBS"
  236. LDFLAGS="$tor_saved_LDFLAGS"
  237. CPPFLAGS="$tor_saved_CPPFLAGS"
  238. ]) dnl end defun
  239. dnl Check whether the prototype for a function is present or missing.
  240. dnl Apple has a nasty habit of putting functions in their libraries (so that
  241. dnl AC_CHECK_FUNCS passes) but not actually declaring them in the headers.
  242. dnl
  243. dnl TOR_CHECK_PROTYPE(1:functionname, 2:macroname, 2: includes)
  244. AC_DEFUN([TOR_CHECK_PROTOTYPE], [
  245. AC_CACHE_CHECK([for declaration of $1], tor_cv_$1_declared, [
  246. AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$3],[void *ptr= $1 ;])],
  247. tor_cv_$1_declared=yes,tor_cv_$1_declared=no)])
  248. if test x$tor_cv_$1_declared != xno ; then
  249. AC_DEFINE($2, 1,
  250. [Defined if the prototype for $1 seems to be present.])
  251. fi
  252. ])