1 ## ltdl.m4 - Configure ltdl for the target system. -*-Autoconf-*-
2 ## Copyright (C) 1999-2000 Free Software Foundation, Inc.
4 ## This program is free software; you can redistribute it and/or modify
5 ## it under the terms of the GNU General Public License as published by
6 ## the Free Software Foundation; either version 2 of the License, or
7 ## (at your option) any later version.
9 ## This program is distributed in the hope that it will be useful, but
10 ## WITHOUT ANY WARRANTY; without even the implied warranty of
11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 ## General Public License for more details.
14 ## You should have received a copy of the GNU General Public License
15 ## along with this program; if not, write to the Free Software
16 ## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 ## As a special exception to the GNU General Public License, if you
19 ## distribute this file as part of a program that contains a
20 ## configuration script generated by Autoconf, you may include it under
21 ## the same distribution terms that you use for the rest of that program.
23 # serial 6 AC_LIB_LTDL
27 # Clients of libltdl can use this macro to allow the installer to
28 # choose between a shipped copy of the ltdl sources or a preinstalled
29 # version of the library.
30 AC_DEFUN([AC_WITH_LTDL],
31 [AC_REQUIRE([AC_LIB_LTDL])
35 # Unless the user asks us to check, assume no installed ltdl exists.
36 use_installed_libltdl=no
38 AC_ARG_WITH([included_ltdl],
39 [ --with-included-ltdl use the GNU ltdl sources included here])
41 if test "x$with_included_ltdl" != xyes; then
42 # We are not being forced to use the included libltdl sources, so
43 # decide whether there is a useful installed version we can use.
44 AC_CHECK_HEADER([ltdl.h],
45 [AC_CHECK_LIB([ltdl], [lt_dlcaller_register],
46 [with_included_ltdl=no],
47 [with_included_ltdl=yes])
51 if test "x$enable_ltdl_install" != xyes; then
52 # If the user did not specify an installable libltdl, then default
53 # to a convenience lib.
54 AC_LIBLTDL_CONVENIENCE
57 if test "x$with_included_ltdl" = xno; then
58 # If the included ltdl is not to be used. then Use the
59 # preinstalled libltdl we found.
60 AC_DEFINE([HAVE_LTDL], 1,
61 [Define this if a modern libltdl is already installed])
65 # Report our decision...
66 AC_MSG_CHECKING([whether to use included libltdl])
67 AC_MSG_RESULT([$with_included_ltdl])
69 AC_CONFIG_SUBDIRS([libltdl])
75 # Perform all the checks necessary for compilation of the ltdl objects
76 # -- including compiler checks and header checks.
77 AC_DEFUN([AC_LIB_LTDL],
79 AC_REQUIRE([AC_PROG_CC])
80 AC_REQUIRE([AC_C_CONST])
81 AC_REQUIRE([AC_HEADER_STDC])
82 AC_REQUIRE([AC_HEADER_DIRENT])
83 AC_REQUIRE([_LT_AC_CHECK_DLFCN])
84 AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])
85 AC_REQUIRE([AC_LTDL_SHLIBEXT])
86 AC_REQUIRE([AC_LTDL_SHLIBPATH])
87 AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])
88 AC_REQUIRE([AC_LTDL_OBJDIR])
89 AC_REQUIRE([AC_LTDL_DLPREOPEN])
90 AC_REQUIRE([AC_LTDL_DLLIB])
91 AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
92 AC_REQUIRE([AC_LTDL_DLSYM_USCORE])
93 AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])
94 AC_REQUIRE([AC_LTDL_FUNC_ARGZ])
96 AC_CHECK_HEADERS([assert.h ctype.h errno.h malloc.h memory.h stdlib.h \
98 AC_CHECK_HEADERS([dl.h sys/dl.h dld.h])
99 AC_CHECK_HEADERS([string.h strings.h], [break])
101 AC_CHECK_FUNCS([strchr index], [break])
102 AC_CHECK_FUNCS([strrchr rindex], [break])
103 AC_CHECK_FUNCS([memcpy bcopy], [break])
104 AC_CHECK_FUNCS([memmove strcmp])
105 AC_CHECK_FUNCS([closedir opendir readdir])
109 # AC_LTDL_ENABLE_INSTALL
110 # ----------------------
111 AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
112 [AC_ARG_ENABLE([ltdl-install],
113 [AC_HELP_STRING([--enable-ltdl-install], [install libltdl])])
115 AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno)
116 AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno)
117 ])])# AC_LTDL_ENABLE_INSTALL
120 # AC_LTDL_SYS_DLOPEN_DEPLIBS
121 # --------------------------
122 AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS],
123 [AC_REQUIRE([AC_CANONICAL_HOST])
124 AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
125 [libltdl_cv_sys_dlopen_deplibs],
126 [# PORTME does your system automatically load deplibs for dlopen?
127 # or its logical equivalent (e.g. shl_load for HP-UX < 11)
128 # For now, we just catch OSes we know something about -- in the
129 # future, we'll try test this programmatically.
130 libltdl_cv_sys_dlopen_deplibs=unknown
132 aix3*|aix4.1.*|aix4.2.*)
133 # Unknown whether this is true for these versions of AIX, but
134 # we want this `case' here to explicitly catch those versions.
135 libltdl_cv_sys_dlopen_deplibs=unknown
138 libltdl_cv_sys_dlopen_deplibs=yes
141 # Assuming the user has installed a libdl from somewhere, this is true
142 # If you are looking for one http://www.opendarwin.org/projects/dlcompat
143 libltdl_cv_sys_dlopen_deplibs=yes
146 libltdl_cv_sys_dlopen_deplibs=yes
149 libltdl_cv_sys_dlopen_deplibs=yes
151 irix[[12345]]*|irix6.[[01]]*)
152 # Catch all versions of IRIX before 6.2, and indicate that we don't
153 # know how it worked for any of those versions.
154 libltdl_cv_sys_dlopen_deplibs=unknown
157 # The case above catches anything before 6.2, and it's known that
158 # at 6.2 and later dlopen does load deplibs.
159 libltdl_cv_sys_dlopen_deplibs=yes
162 libltdl_cv_sys_dlopen_deplibs=yes
165 libltdl_cv_sys_dlopen_deplibs=yes
168 libltdl_cv_sys_dlopen_deplibs=yes
171 # dlopen did load deplibs (at least at 4.x), but until the 5.x series,
172 # it did *not* use an RPATH in a shared library to find objects the
173 # library depends on, so we explictly say `no'.
174 libltdl_cv_sys_dlopen_deplibs=no
176 osf5.0|osf5.0a|osf5.1)
177 # dlopen *does* load deplibs and with the right loader patch applied
178 # it even uses RPATH in a shared library to search for shared objects
179 # that the library depends on, but there's no easy way to know if that
180 # patch is installed. Since this is the case, all we can really
181 # say is unknown -- it depends on the patch being installed. If
182 # it is, this changes to `yes'. Without it, it would be `no'.
183 libltdl_cv_sys_dlopen_deplibs=unknown
186 # the two cases above should catch all versions of osf <= 5.1. Read
187 # the comments above for what we know about them.
188 # At > 5.1, deplibs are loaded *and* any RPATH in a shared library
189 # is used to find them so we can finally say `yes'.
190 libltdl_cv_sys_dlopen_deplibs=yes
193 libltdl_cv_sys_dlopen_deplibs=yes
197 if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
198 AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1],
199 [Define if the OS needs help to load dependent libraries for dlopen().])
201 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS
206 AC_DEFUN([AC_LTDL_SHLIBEXT],
207 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
208 AC_CACHE_CHECK([which extension is used for shared libraries],
209 [libltdl_cv_shlibext],
211 for ac_spec in $library_names_spec; do
214 echo "$ac_last" | [sed 's/\[.*\]//;s/^[^.]*//;s/\$.*$//;s/\.$//'] > conftest
215 libltdl_cv_shlibext=`cat conftest`
218 # The above does not work on darwin, due to the test's in the library_names_spec
219 # The test description should probably say "which extension is used for loadable
222 darwin*) libltdl_cv_shlibext=".so" ;;
224 if test -n "$libltdl_cv_shlibext"; then
225 AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",
226 [Define to the extension used for shared libraries, say, ".so".])
233 AC_DEFUN([AC_LTDL_SHLIBPATH],
234 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
235 AC_CACHE_CHECK([which variable specifies run-time library path],
236 [libltdl_cv_shlibpath_var], [libltdl_cv_shlibpath_var="$shlibpath_var"])
237 if test -n "$libltdl_cv_shlibpath_var"; then
238 AC_DEFINE_UNQUOTED(LTDL_SHLIBPATH_VAR, "$libltdl_cv_shlibpath_var",
239 [Define to the name of the environment variable that determines the dynamic library search path.])
241 ])# AC_LTDL_SHLIBPATH
244 # AC_LTDL_SYSSEARCHPATH
245 # ---------------------
246 AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
247 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
248 AC_CACHE_CHECK([for the default library search path],
249 [libltdl_cv_sys_search_path],
250 [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
251 if test -n "$libltdl_cv_sys_search_path"; then
253 for dir in $libltdl_cv_sys_search_path; do
254 if test -z "$sys_search_path"; then
255 sys_search_path="$dir"
257 sys_search_path="$sys_search_path$PATH_SEPARATOR$dir"
260 AC_DEFINE_UNQUOTED(LTDL_SYSSEARCHPATH, "$sys_search_path",
261 [Define to the system default library search path.])
263 ])# AC_LTDL_SYSSEARCHPATH
268 AC_DEFUN([AC_LTDL_OBJDIR],
269 [AC_CACHE_CHECK([for objdir],
271 [libltdl_cv_objdir="$objdir"
272 if test -n "$objdir"; then
275 rm -f .libs 2>/dev/null
276 mkdir .libs 2>/dev/null
277 if test -d .libs; then
278 libltdl_cv_objdir=.libs
280 # MS-DOS does not allow filenames that begin with a dot.
281 libltdl_cv_objdir=_libs
283 rmdir .libs 2>/dev/null
286 AC_DEFINE_UNQUOTED(LTDL_OBJDIR, "$libltdl_cv_objdir/",
287 [Define to the sub-directory in which libtool stores uninstalled libraries.])
293 AC_DEFUN([AC_LTDL_DLPREOPEN],
294 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
295 AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
296 [libltdl_cv_preloaded_symbols],
297 [if test -n "$lt_cv_sys_global_symbol_pipe"; then
298 libltdl_cv_preloaded_symbols=yes
300 libltdl_cv_preloaded_symbols=no
303 if test x"$libltdl_cv_preloaded_symbols" = xyes; then
304 AC_DEFINE(HAVE_PRELOADED_SYMBOLS, 1,
305 [Define if libtool can extract symbol lists from object files.])
307 ])# AC_LTDL_DLPREOPEN
312 AC_DEFUN([AC_LTDL_DLLIB],
317 AC_CHECK_FUNC([shl_load],
318 [AC_DEFINE([HAVE_SHL_LOAD], [1],
319 [Define if you have the shl_load function.])],
320 [AC_CHECK_LIB([dld], [shl_load],
321 [AC_DEFINE([HAVE_SHL_LOAD], [1],
322 [Define if you have the shl_load function.])
323 LIBADD_DL="$LIBADD_DL -ldld"],
324 [AC_CHECK_LIB([dl], [dlopen],
325 [AC_DEFINE([HAVE_LIBDL], [1],
326 [Define if you have the libdl library or equivalent.])
327 LIBADD_DL="-ldl" libltdl_cv_lib_dl_dlopen="yes"],
328 [AC_TRY_LINK([#if HAVE_DLFCN_H
333 [AC_DEFINE([HAVE_LIBDL], [1],
334 [Define if you have the libdl library or equivalent.]) libltdl_cv_func_dlopen="yes"],
335 [AC_CHECK_LIB([svld], [dlopen],
336 [AC_DEFINE([HAVE_LIBDL], [1],
337 [Define if you have the libdl library or equivalent.])
338 LIBADD_DL="-lsvld" libltdl_cv_func_dlopen="yes"],
339 [AC_CHECK_LIB([dld], [dld_link],
340 [AC_DEFINE([HAVE_DLD], [1],
341 [Define if you have the GNU dld library.])
342 LIBADD_DL="$LIBADD_DL -ldld"
350 if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes
353 LIBS="$LIBS $LIBADD_DL"
354 AC_CHECK_FUNCS([dlerror])
361 # AC_LTDL_SYMBOL_USCORE
362 # ---------------------
363 # does the compiler prefix global symbols with an underscore?
364 AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
365 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
366 AC_CACHE_CHECK([for _ prefix in compiled symbols],
367 [ac_cv_sys_symbol_underscore],
368 [ac_cv_sys_symbol_underscore=no
369 cat > conftest.$ac_ext <<EOF
370 void nm_test_func(){}
371 int main(){nm_test_func;return 0;}
373 if AC_TRY_EVAL(ac_compile); then
374 # Now try to grab the symbols.
376 if AC_TRY_EVAL(NM conftest.$ac_objext \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
377 # See whether the symbols have a leading underscore.
378 if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
379 ac_cv_sys_symbol_underscore=yes
381 if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
384 echo "configure: cannot find nm_test_func in $ac_nlist" >&AC_FD_CC
388 echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AC_FD_CC
391 echo "configure: failed program was:" >&AC_FD_CC
392 cat conftest.c >&AC_FD_CC
396 ])# AC_LTDL_SYMBOL_USCORE
399 # AC_LTDL_DLSYM_USCORE
400 # --------------------
401 AC_DEFUN([AC_LTDL_DLSYM_USCORE],
402 [AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
403 if test x"$ac_cv_sys_symbol_underscore" = xyes; then
404 if test x"$libltdl_cv_func_dlopen" = xyes ||
405 test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
406 AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
407 [libltdl_cv_need_uscore],
408 [libltdl_cv_need_uscore=unknown
410 LIBS="$LIBS $LIBADD_DL"
411 _LT_AC_TRY_DLOPEN_SELF(
412 [libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
413 [], [libltdl_cv_need_uscore=cross])
419 if test x"$libltdl_cv_need_uscore" = xyes; then
420 AC_DEFINE(NEED_USCORE, 1,
421 [Define if dlsym() requires a leading underscore in symbol names.])
423 ])# AC_LTDL_DLSYM_USCORE
427 AC_DEFUN([AC_LTDL_FUNC_ARGZ],
428 [AC_CHECK_HEADERS([argz.h])
430 AC_CHECK_TYPES([error_t],
432 [AC_DEFINE([error_t], [int],
433 [Define to a type to use for `error_t' if it is not otherwise available.])],
438 AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify])
439 ])# AC_LTDL_FUNC_ARGZ