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
28 # Clients of libltdl can use this macro to allow the installer to
29 # choose between a shipped copy of the ltdl sources or a preinstalled
30 # version of the library.
31 AC_DEFUN([AC_WITH_LTDL],
32 [AC_REQUIRE([AC_LIB_LTDL])
36 # Unless the user asks us to check, assume no installed ltdl exists.
37 use_installed_libltdl=no
39 AC_ARG_WITH([included_ltdl],
40 [ --with-included-ltdl use the GNU ltdl sources included here])
42 if test "x$with_included_ltdl" != xyes; then
43 # We are not being forced to use the included libltdl sources, so
44 # decide whether there is a useful installed version we can use.
45 AC_CHECK_HEADER([ltdl.h],
46 [AC_CHECK_LIB([ltdl], [lt_dlcaller_register],
47 [with_included_ltdl=no],
48 [with_included_ltdl=yes])
52 if test "x$enable_ltdl_install" != xyes; then
53 # If the user did not specify an installable libltdl, then default
54 # to a convenience lib.
55 AC_LIBLTDL_CONVENIENCE
58 if test "x$with_included_ltdl" = xno; then
59 # If the included ltdl is not to be used. then Use the
60 # preinstalled libltdl we found.
61 AC_DEFINE([HAVE_LTDL], 1,
62 [Define this if a modern libltdl is already installed])
66 # Report our decision...
67 AC_MSG_CHECKING([whether to use included libltdl])
68 AC_MSG_RESULT([$with_included_ltdl])
70 AC_CONFIG_SUBDIRS([libltdl])
76 # Perform all the checks necessary for compilation of the ltdl objects
77 # -- including compiler checks and header checks.
78 AC_DEFUN([AC_LIB_LTDL],
80 AC_REQUIRE([AC_PROG_CC])
81 AC_REQUIRE([AC_C_CONST])
82 AC_REQUIRE([AC_HEADER_STDC])
83 AC_REQUIRE([AC_HEADER_DIRENT])
84 AC_REQUIRE([_LT_AC_CHECK_DLFCN])
85 AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])
86 AC_REQUIRE([AC_LTDL_SHLIBEXT])
87 AC_REQUIRE([AC_LTDL_SHLIBPATH])
88 AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])
89 AC_REQUIRE([AC_LTDL_OBJDIR])
90 AC_REQUIRE([AC_LTDL_DLPREOPEN])
91 AC_REQUIRE([AC_LTDL_DLLIB])
92 AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
93 AC_REQUIRE([AC_LTDL_DLSYM_USCORE])
94 AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])
95 AC_REQUIRE([AC_LTDL_FUNC_ARGZ])
97 AC_CHECK_HEADERS([assert.h ctype.h errno.h malloc.h memory.h stdlib.h \
99 AC_CHECK_HEADERS([dl.h sys/dl.h dld.h mach-o/dyld.h])
100 AC_CHECK_HEADERS([string.h strings.h], [break])
102 AC_CHECK_FUNCS([strchr index], [break])
103 AC_CHECK_FUNCS([strrchr rindex], [break])
104 AC_CHECK_FUNCS([memcpy bcopy], [break])
105 AC_CHECK_FUNCS([memmove strcmp])
106 AC_CHECK_FUNCS([closedir opendir readdir])
110 # AC_LTDL_ENABLE_INSTALL
111 # ----------------------
112 AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
113 [AC_ARG_ENABLE([ltdl-install],
114 [AC_HELP_STRING([--enable-ltdl-install], [install libltdl])])
116 AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno)
117 AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno)
118 ])])# AC_LTDL_ENABLE_INSTALL
121 # AC_LTDL_SYS_DLOPEN_DEPLIBS
122 # --------------------------
123 AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS],
124 [AC_REQUIRE([AC_CANONICAL_HOST])
125 AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
126 [libltdl_cv_sys_dlopen_deplibs],
127 [# PORTME does your system automatically load deplibs for dlopen?
128 # or its logical equivalent (e.g. shl_load for HP-UX < 11)
129 # For now, we just catch OSes we know something about -- in the
130 # future, we'll try test this programmatically.
131 libltdl_cv_sys_dlopen_deplibs=unknown
133 aix3*|aix4.1.*|aix4.2.*)
134 # Unknown whether this is true for these versions of AIX, but
135 # we want this `case' here to explicitly catch those versions.
136 libltdl_cv_sys_dlopen_deplibs=unknown
139 libltdl_cv_sys_dlopen_deplibs=yes
142 # Assuming the user has installed a libdl from somewhere, this is true
143 # If you are looking for one http://www.opendarwin.org/projects/dlcompat
144 libltdl_cv_sys_dlopen_deplibs=yes
146 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
147 # GNU and its variants, using gnu ld.so (Glibc)
148 libltdl_cv_sys_dlopen_deplibs=yes
151 libltdl_cv_sys_dlopen_deplibs=yes
153 irix[[12345]]*|irix6.[[01]]*)
154 # Catch all versions of IRIX before 6.2, and indicate that we don't
155 # know how it worked for any of those versions.
156 libltdl_cv_sys_dlopen_deplibs=unknown
159 # The case above catches anything before 6.2, and it's known that
160 # at 6.2 and later dlopen does load deplibs.
161 libltdl_cv_sys_dlopen_deplibs=yes
163 netbsd* | netbsdelf*-gnu)
164 libltdl_cv_sys_dlopen_deplibs=yes
167 libltdl_cv_sys_dlopen_deplibs=yes
170 # dlopen did load deplibs (at least at 4.x), but until the 5.x series,
171 # it did *not* use an RPATH in a shared library to find objects the
172 # library depends on, so we explictly say `no'.
173 libltdl_cv_sys_dlopen_deplibs=no
175 osf5.0|osf5.0a|osf5.1)
176 # dlopen *does* load deplibs and with the right loader patch applied
177 # it even uses RPATH in a shared library to search for shared objects
178 # that the library depends on, but there's no easy way to know if that
179 # patch is installed. Since this is the case, all we can really
180 # say is unknown -- it depends on the patch being installed. If
181 # it is, this changes to `yes'. Without it, it would be `no'.
182 libltdl_cv_sys_dlopen_deplibs=unknown
185 # the two cases above should catch all versions of osf <= 5.1. Read
186 # the comments above for what we know about them.
187 # At > 5.1, deplibs are loaded *and* any RPATH in a shared library
188 # is used to find them so we can finally say `yes'.
189 libltdl_cv_sys_dlopen_deplibs=yes
192 libltdl_cv_sys_dlopen_deplibs=yes
196 if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
197 AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1],
198 [Define if the OS needs help to load dependent libraries for dlopen().])
200 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS
205 AC_DEFUN([AC_LTDL_SHLIBEXT],
206 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
207 AC_CACHE_CHECK([which extension is used for loadable modules],
208 [libltdl_cv_shlibext],
211 eval libltdl_cv_shlibext=$shrext_cmds
213 if test -n "$libltdl_cv_shlibext"; then
214 AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",
215 [Define to the extension used for shared libraries, say, ".so".])
222 AC_DEFUN([AC_LTDL_SHLIBPATH],
223 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
224 AC_CACHE_CHECK([which variable specifies run-time library path],
225 [libltdl_cv_shlibpath_var], [libltdl_cv_shlibpath_var="$shlibpath_var"])
226 if test -n "$libltdl_cv_shlibpath_var"; then
227 AC_DEFINE_UNQUOTED(LTDL_SHLIBPATH_VAR, "$libltdl_cv_shlibpath_var",
228 [Define to the name of the environment variable that determines the dynamic library search path.])
230 ])# AC_LTDL_SHLIBPATH
233 # AC_LTDL_SYSSEARCHPATH
234 # ---------------------
235 AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
236 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
237 AC_CACHE_CHECK([for the default library search path],
238 [libltdl_cv_sys_search_path],
239 [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
240 if test -n "$libltdl_cv_sys_search_path"; then
242 for dir in $libltdl_cv_sys_search_path; do
243 if test -z "$sys_search_path"; then
244 sys_search_path="$dir"
246 sys_search_path="$sys_search_path$PATH_SEPARATOR$dir"
249 AC_DEFINE_UNQUOTED(LTDL_SYSSEARCHPATH, "$sys_search_path",
250 [Define to the system default library search path.])
252 ])# AC_LTDL_SYSSEARCHPATH
257 AC_DEFUN([AC_LTDL_OBJDIR],
258 [AC_CACHE_CHECK([for objdir],
260 [libltdl_cv_objdir="$objdir"
261 if test -n "$objdir"; then
264 rm -f .libs 2>/dev/null
265 mkdir .libs 2>/dev/null
266 if test -d .libs; then
267 libltdl_cv_objdir=.libs
269 # MS-DOS does not allow filenames that begin with a dot.
270 libltdl_cv_objdir=_libs
272 rmdir .libs 2>/dev/null
275 AC_DEFINE_UNQUOTED(LTDL_OBJDIR, "$libltdl_cv_objdir/",
276 [Define to the sub-directory in which libtool stores uninstalled libraries.])
282 AC_DEFUN([AC_LTDL_DLPREOPEN],
283 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
284 AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
285 [libltdl_cv_preloaded_symbols],
286 [if test -n "$lt_cv_sys_global_symbol_pipe"; then
287 libltdl_cv_preloaded_symbols=yes
289 libltdl_cv_preloaded_symbols=no
292 if test x"$libltdl_cv_preloaded_symbols" = xyes; then
293 AC_DEFINE(HAVE_PRELOADED_SYMBOLS, 1,
294 [Define if libtool can extract symbol lists from object files.])
296 ])# AC_LTDL_DLPREOPEN
301 AC_DEFUN([AC_LTDL_DLLIB],
306 AC_CHECK_FUNC([shl_load],
307 [AC_DEFINE([HAVE_SHL_LOAD], [1],
308 [Define if you have the shl_load function.])],
309 [AC_CHECK_LIB([dld], [shl_load],
310 [AC_DEFINE([HAVE_SHL_LOAD], [1],
311 [Define if you have the shl_load function.])
312 LIBADD_DL="$LIBADD_DL -ldld"],
313 [AC_CHECK_LIB([dl], [dlopen],
314 [AC_DEFINE([HAVE_LIBDL], [1],
315 [Define if you have the libdl library or equivalent.])
316 LIBADD_DL="-ldl" libltdl_cv_lib_dl_dlopen="yes"],
317 [AC_TRY_LINK([#if HAVE_DLFCN_H
322 [AC_DEFINE([HAVE_LIBDL], [1],
323 [Define if you have the libdl library or equivalent.]) libltdl_cv_func_dlopen="yes"],
324 [AC_CHECK_LIB([svld], [dlopen],
325 [AC_DEFINE([HAVE_LIBDL], [1],
326 [Define if you have the libdl library or equivalent.])
327 LIBADD_DL="-lsvld" libltdl_cv_func_dlopen="yes"],
328 [AC_CHECK_LIB([dld], [dld_link],
329 [AC_DEFINE([HAVE_DLD], [1],
330 [Define if you have the GNU dld library.])
331 LIBADD_DL="$LIBADD_DL -ldld"],
332 [AC_CHECK_FUNC([_dyld_func_lookup],
333 [AC_DEFINE([HAVE_DYLD], [1],
334 [Define if you have the _dyld_func_lookup function.])])
342 if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes
345 LIBS="$LIBS $LIBADD_DL"
346 AC_CHECK_FUNCS([dlerror])
353 # AC_LTDL_SYMBOL_USCORE
354 # ---------------------
355 # does the compiler prefix global symbols with an underscore?
356 AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
357 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
358 AC_CACHE_CHECK([for _ prefix in compiled symbols],
359 [ac_cv_sys_symbol_underscore],
360 [ac_cv_sys_symbol_underscore=no
361 cat > conftest.$ac_ext <<EOF
362 void nm_test_func(){}
363 int main(){nm_test_func;return 0;}
365 if AC_TRY_EVAL(ac_compile); then
366 # Now try to grab the symbols.
368 if AC_TRY_EVAL(NM conftest.$ac_objext \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
369 # See whether the symbols have a leading underscore.
370 if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
371 ac_cv_sys_symbol_underscore=yes
373 if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
376 echo "configure: cannot find nm_test_func in $ac_nlist" >&AC_FD_CC
380 echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AC_FD_CC
383 echo "configure: failed program was:" >&AC_FD_CC
384 cat conftest.c >&AC_FD_CC
388 ])# AC_LTDL_SYMBOL_USCORE
391 # AC_LTDL_DLSYM_USCORE
392 # --------------------
393 AC_DEFUN([AC_LTDL_DLSYM_USCORE],
394 [AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
395 if test x"$ac_cv_sys_symbol_underscore" = xyes; then
396 if test x"$libltdl_cv_func_dlopen" = xyes ||
397 test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
398 AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
399 [libltdl_cv_need_uscore],
400 [libltdl_cv_need_uscore=unknown
402 LIBS="$LIBS $LIBADD_DL"
403 _LT_AC_TRY_DLOPEN_SELF(
404 [libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
405 [], [libltdl_cv_need_uscore=cross])
411 if test x"$libltdl_cv_need_uscore" = xyes; then
412 AC_DEFINE(NEED_USCORE, 1,
413 [Define if dlsym() requires a leading underscore in symbol names.])
415 ])# AC_LTDL_DLSYM_USCORE
419 AC_DEFUN([AC_LTDL_FUNC_ARGZ],
420 [AC_CHECK_HEADERS([argz.h])
422 AC_CHECK_TYPES([error_t],
424 [AC_DEFINE([error_t], [int],
425 [Define to a type to use for `error_t' if it is not otherwise available.])],
430 AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify])
431 ])# AC_LTDL_FUNC_ARGZ