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 mach-o/dyld.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
145 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
146 # GNU and its variants, using gnu ld.so (Glibc)
147 libltdl_cv_sys_dlopen_deplibs=yes
150 libltdl_cv_sys_dlopen_deplibs=yes
152 irix[[12345]]*|irix6.[[01]]*)
153 # Catch all versions of IRIX before 6.2, and indicate that we don't
154 # know how it worked for any of those versions.
155 libltdl_cv_sys_dlopen_deplibs=unknown
158 # The case above catches anything before 6.2, and it's known that
159 # at 6.2 and later dlopen does load deplibs.
160 libltdl_cv_sys_dlopen_deplibs=yes
163 libltdl_cv_sys_dlopen_deplibs=yes
166 libltdl_cv_sys_dlopen_deplibs=yes
169 # dlopen did load deplibs (at least at 4.x), but until the 5.x series,
170 # it did *not* use an RPATH in a shared library to find objects the
171 # library depends on, so we explictly say `no'.
172 libltdl_cv_sys_dlopen_deplibs=no
174 osf5.0|osf5.0a|osf5.1)
175 # dlopen *does* load deplibs and with the right loader patch applied
176 # it even uses RPATH in a shared library to search for shared objects
177 # that the library depends on, but there's no easy way to know if that
178 # patch is installed. Since this is the case, all we can really
179 # say is unknown -- it depends on the patch being installed. If
180 # it is, this changes to `yes'. Without it, it would be `no'.
181 libltdl_cv_sys_dlopen_deplibs=unknown
184 # the two cases above should catch all versions of osf <= 5.1. Read
185 # the comments above for what we know about them.
186 # At > 5.1, deplibs are loaded *and* any RPATH in a shared library
187 # is used to find them so we can finally say `yes'.
188 libltdl_cv_sys_dlopen_deplibs=yes
191 libltdl_cv_sys_dlopen_deplibs=yes
195 if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
196 AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1],
197 [Define if the OS needs help to load dependent libraries for dlopen().])
199 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS
204 AC_DEFUN([AC_LTDL_SHLIBEXT],
205 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
206 AC_CACHE_CHECK([which extension is used for loadable modules],
207 [libltdl_cv_shlibext],
210 eval libltdl_cv_shlibext=$shrext_cmds
212 if test -n "$libltdl_cv_shlibext"; then
213 AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",
214 [Define to the extension used for shared libraries, say, ".so".])
221 AC_DEFUN([AC_LTDL_SHLIBPATH],
222 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
223 AC_CACHE_CHECK([which variable specifies run-time library path],
224 [libltdl_cv_shlibpath_var], [libltdl_cv_shlibpath_var="$shlibpath_var"])
225 if test -n "$libltdl_cv_shlibpath_var"; then
226 AC_DEFINE_UNQUOTED(LTDL_SHLIBPATH_VAR, "$libltdl_cv_shlibpath_var",
227 [Define to the name of the environment variable that determines the dynamic library search path.])
229 ])# AC_LTDL_SHLIBPATH
232 # AC_LTDL_SYSSEARCHPATH
233 # ---------------------
234 AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
235 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
236 AC_CACHE_CHECK([for the default library search path],
237 [libltdl_cv_sys_search_path],
238 [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
239 if test -n "$libltdl_cv_sys_search_path"; then
241 for dir in $libltdl_cv_sys_search_path; do
242 if test -z "$sys_search_path"; then
243 sys_search_path="$dir"
245 sys_search_path="$sys_search_path$PATH_SEPARATOR$dir"
248 AC_DEFINE_UNQUOTED(LTDL_SYSSEARCHPATH, "$sys_search_path",
249 [Define to the system default library search path.])
251 ])# AC_LTDL_SYSSEARCHPATH
256 AC_DEFUN([AC_LTDL_OBJDIR],
257 [AC_CACHE_CHECK([for objdir],
259 [libltdl_cv_objdir="$objdir"
260 if test -n "$objdir"; then
263 rm -f .libs 2>/dev/null
264 mkdir .libs 2>/dev/null
265 if test -d .libs; then
266 libltdl_cv_objdir=.libs
268 # MS-DOS does not allow filenames that begin with a dot.
269 libltdl_cv_objdir=_libs
271 rmdir .libs 2>/dev/null
274 AC_DEFINE_UNQUOTED(LTDL_OBJDIR, "$libltdl_cv_objdir/",
275 [Define to the sub-directory in which libtool stores uninstalled libraries.])
281 AC_DEFUN([AC_LTDL_DLPREOPEN],
282 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
283 AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
284 [libltdl_cv_preloaded_symbols],
285 [if test -n "$lt_cv_sys_global_symbol_pipe"; then
286 libltdl_cv_preloaded_symbols=yes
288 libltdl_cv_preloaded_symbols=no
291 if test x"$libltdl_cv_preloaded_symbols" = xyes; then
292 AC_DEFINE(HAVE_PRELOADED_SYMBOLS, 1,
293 [Define if libtool can extract symbol lists from object files.])
295 ])# AC_LTDL_DLPREOPEN
300 AC_DEFUN([AC_LTDL_DLLIB],
305 AC_CHECK_FUNC([shl_load],
306 [AC_DEFINE([HAVE_SHL_LOAD], [1],
307 [Define if you have the shl_load function.])],
308 [AC_CHECK_LIB([dld], [shl_load],
309 [AC_DEFINE([HAVE_SHL_LOAD], [1],
310 [Define if you have the shl_load function.])
311 LIBADD_DL="$LIBADD_DL -ldld"],
312 [AC_CHECK_LIB([dl], [dlopen],
313 [AC_DEFINE([HAVE_LIBDL], [1],
314 [Define if you have the libdl library or equivalent.])
315 LIBADD_DL="-ldl" libltdl_cv_lib_dl_dlopen="yes"],
316 [AC_TRY_LINK([#if HAVE_DLFCN_H
321 [AC_DEFINE([HAVE_LIBDL], [1],
322 [Define if you have the libdl library or equivalent.]) libltdl_cv_func_dlopen="yes"],
323 [AC_CHECK_LIB([svld], [dlopen],
324 [AC_DEFINE([HAVE_LIBDL], [1],
325 [Define if you have the libdl library or equivalent.])
326 LIBADD_DL="-lsvld" libltdl_cv_func_dlopen="yes"],
327 [AC_CHECK_LIB([dld], [dld_link],
328 [AC_DEFINE([HAVE_DLD], [1],
329 [Define if you have the GNU dld library.])
330 LIBADD_DL="$LIBADD_DL -ldld"],
331 [AC_CHECK_FUNC([_dyld_func_lookup],
332 [AC_DEFINE([HAVE_DYLD], [1],
333 [Define if you have the _dyld_func_lookup function.])])
341 if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes
344 LIBS="$LIBS $LIBADD_DL"
345 AC_CHECK_FUNCS([dlerror])
352 # AC_LTDL_SYMBOL_USCORE
353 # ---------------------
354 # does the compiler prefix global symbols with an underscore?
355 AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
356 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
357 AC_CACHE_CHECK([for _ prefix in compiled symbols],
358 [ac_cv_sys_symbol_underscore],
359 [ac_cv_sys_symbol_underscore=no
360 cat > conftest.$ac_ext <<EOF
361 void nm_test_func(){}
362 int main(){nm_test_func;return 0;}
364 if AC_TRY_EVAL(ac_compile); then
365 # Now try to grab the symbols.
367 if AC_TRY_EVAL(NM conftest.$ac_objext \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
368 # See whether the symbols have a leading underscore.
369 if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
370 ac_cv_sys_symbol_underscore=yes
372 if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
375 echo "configure: cannot find nm_test_func in $ac_nlist" >&AC_FD_CC
379 echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AC_FD_CC
382 echo "configure: failed program was:" >&AC_FD_CC
383 cat conftest.c >&AC_FD_CC
387 ])# AC_LTDL_SYMBOL_USCORE
390 # AC_LTDL_DLSYM_USCORE
391 # --------------------
392 AC_DEFUN([AC_LTDL_DLSYM_USCORE],
393 [AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
394 if test x"$ac_cv_sys_symbol_underscore" = xyes; then
395 if test x"$libltdl_cv_func_dlopen" = xyes ||
396 test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
397 AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
398 [libltdl_cv_need_uscore],
399 [libltdl_cv_need_uscore=unknown
401 LIBS="$LIBS $LIBADD_DL"
402 _LT_AC_TRY_DLOPEN_SELF(
403 [libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
404 [], [libltdl_cv_need_uscore=cross])
410 if test x"$libltdl_cv_need_uscore" = xyes; then
411 AC_DEFINE(NEED_USCORE, 1,
412 [Define if dlsym() requires a leading underscore in symbol names.])
414 ])# AC_LTDL_DLSYM_USCORE
418 AC_DEFUN([AC_LTDL_FUNC_ARGZ],
419 [AC_CHECK_HEADERS([argz.h])
421 AC_CHECK_TYPES([error_t],
423 [AC_DEFINE([error_t], [int],
424 [Define to a type to use for `error_t' if it is not otherwise available.])],
429 AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify])
430 ])# AC_LTDL_FUNC_ARGZ