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 libltdl_cv_sys_dlopen_deplibs=yes
144 libltdl_cv_sys_dlopen_deplibs=yes
146 irix[[12345]]*|irix6.[[01]]*)
147 # Catch all versions of IRIX before 6.2, and indicate that we don't
148 # know how it worked for any of those versions.
149 libltdl_cv_sys_dlopen_deplibs=unknown
152 # The case above catches anything before 6.2, and it's known that
153 # at 6.2 and later dlopen does load deplibs.
154 libltdl_cv_sys_dlopen_deplibs=yes
157 libltdl_cv_sys_dlopen_deplibs=yes
160 libltdl_cv_sys_dlopen_deplibs=yes
163 libltdl_cv_sys_dlopen_deplibs=yes
166 # dlopen did load deplibs (at least at 4.x), but until the 5.x series,
167 # it did *not* use an RPATH in a shared library to find objects the
168 # library depends on, so we explictly say `no'.
169 libltdl_cv_sys_dlopen_deplibs=no
171 osf5.0|osf5.0a|osf5.1)
172 # dlopen *does* load deplibs and with the right loader patch applied
173 # it even uses RPATH in a shared library to search for shared objects
174 # that the library depends on, but there's no easy way to know if that
175 # patch is installed. Since this is the case, all we can really
176 # say is unknown -- it depends on the patch being installed. If
177 # it is, this changes to `yes'. Without it, it would be `no'.
178 libltdl_cv_sys_dlopen_deplibs=unknown
181 # the two cases above should catch all versions of osf <= 5.1. Read
182 # the comments above for what we know about them.
183 # At > 5.1, deplibs are loaded *and* any RPATH in a shared library
184 # is used to find them so we can finally say `yes'.
185 libltdl_cv_sys_dlopen_deplibs=yes
188 libltdl_cv_sys_dlopen_deplibs=yes
192 if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
193 AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1],
194 [Define if the OS needs help to load dependent libraries for dlopen().])
196 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS
201 AC_DEFUN([AC_LTDL_SHLIBEXT],
202 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
203 AC_CACHE_CHECK([which extension is used for shared libraries],
204 [libltdl_cv_shlibext],
206 for ac_spec in $library_names_spec; do
209 echo "$ac_last" | [sed 's/\[.*\]//;s/^[^.]*//;s/\$.*$//;s/\.$//'] > conftest
210 libltdl_cv_shlibext=`cat conftest`
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"
339 if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes
342 LIBS="$LIBS $LIBADD_DL"
343 AC_CHECK_FUNCS([dlerror])
350 # AC_LTDL_SYMBOL_USCORE
351 # ---------------------
352 # does the compiler prefix global symbols with an underscore?
353 AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
354 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
355 AC_CACHE_CHECK([for _ prefix in compiled symbols],
356 [ac_cv_sys_symbol_underscore],
357 [ac_cv_sys_symbol_underscore=no
358 cat > conftest.$ac_ext <<EOF
359 void nm_test_func(){}
360 int main(){nm_test_func;return 0;}
362 if AC_TRY_EVAL(ac_compile); then
363 # Now try to grab the symbols.
365 if AC_TRY_EVAL(NM conftest.$ac_objext \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
366 # See whether the symbols have a leading underscore.
367 if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
368 ac_cv_sys_symbol_underscore=yes
370 if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
373 echo "configure: cannot find nm_test_func in $ac_nlist" >&AC_FD_CC
377 echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AC_FD_CC
380 echo "configure: failed program was:" >&AC_FD_CC
381 cat conftest.c >&AC_FD_CC
385 ])# AC_LTDL_SYMBOL_USCORE
388 # AC_LTDL_DLSYM_USCORE
389 # --------------------
390 AC_DEFUN([AC_LTDL_DLSYM_USCORE],
391 [AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
392 if test x"$ac_cv_sys_symbol_underscore" = xyes; then
393 if test x"$libltdl_cv_func_dlopen" = xyes ||
394 test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
395 AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
396 [libltdl_cv_need_uscore],
397 [libltdl_cv_need_uscore=unknown
399 LIBS="$LIBS $LIBADD_DL"
400 _LT_AC_TRY_DLOPEN_SELF(
401 [libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
402 [], [libltdl_cv_need_uscore=cross])
408 if test x"$libltdl_cv_need_uscore" = xyes; then
409 AC_DEFINE(NEED_USCORE, 1,
410 [Define if dlsym() requires a leading underscore in symbol names.])
412 ])# AC_LTDL_DLSYM_USCORE
416 AC_DEFUN([AC_LTDL_FUNC_ARGZ],
417 [AC_CHECK_HEADERS([argz.h])
419 AC_CHECK_TYPES([error_t],
421 [AC_DEFINE([error_t], [int],
422 [Define to a type to use for `error_t' if it is not otherwise available.])],
427 AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify])
428 ])# AC_LTDL_FUNC_ARGZ