1 ## ltdl.m4 - Configure ltdl for the target system. -*-Autoconf-*-
2 ## Copyright (C) 1999-2000 Free Software Foundation, Inc.
4 ## This file is free software; the Free Software Foundation gives
5 ## unlimited permission to copy and/or distribute it, with or without
6 ## modifications, as long as this notice is preserved.
12 # Clients of libltdl can use this macro to allow the installer to
13 # choose between a shipped copy of the ltdl sources or a preinstalled
14 # version of the library.
15 AC_DEFUN([AC_WITH_LTDL],
16 [AC_REQUIRE([AC_LIB_LTDL])
20 # Unless the user asks us to check, assume no installed ltdl exists.
21 use_installed_libltdl=no
23 AC_ARG_WITH([included_ltdl],
24 [ --with-included-ltdl use the GNU ltdl sources included here])
26 if test "x$with_included_ltdl" != xyes; then
27 # We are not being forced to use the included libltdl sources, so
28 # decide whether there is a useful installed version we can use.
29 AC_CHECK_HEADER([ltdl.h],
30 [AC_CHECK_LIB([ltdl], [lt_dlcaller_register],
31 [with_included_ltdl=no],
32 [with_included_ltdl=yes])
36 if test "x$enable_ltdl_install" != xyes; then
37 # If the user did not specify an installable libltdl, then default
38 # to a convenience lib.
39 AC_LIBLTDL_CONVENIENCE
42 if test "x$with_included_ltdl" = xno; then
43 # If the included ltdl is not to be used. then Use the
44 # preinstalled libltdl we found.
45 AC_DEFINE([HAVE_LTDL], [1],
46 [Define this if a modern libltdl is already installed])
50 # Report our decision...
51 AC_MSG_CHECKING([whether to use included libltdl])
52 AC_MSG_RESULT([$with_included_ltdl])
54 AC_CONFIG_SUBDIRS([libltdl])
60 # Perform all the checks necessary for compilation of the ltdl objects
61 # -- including compiler checks and header checks.
62 AC_DEFUN([AC_LIB_LTDL],
64 AC_REQUIRE([AC_PROG_CC])
65 AC_REQUIRE([AC_C_CONST])
66 AC_REQUIRE([AC_HEADER_STDC])
67 AC_REQUIRE([AC_HEADER_DIRENT])
68 AC_REQUIRE([_LT_AC_CHECK_DLFCN])
69 AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])
70 AC_REQUIRE([AC_LTDL_SHLIBEXT])
71 AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])
72 AC_REQUIRE([AC_LTDL_OBJDIR])
73 AC_REQUIRE([AC_LTDL_DLPREOPEN])
74 AC_REQUIRE([AC_LTDL_DLLIB])
75 AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
76 AC_REQUIRE([AC_LTDL_DLSYM_USCORE])
77 AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])
78 AC_REQUIRE([AC_LTDL_FUNC_ARGZ])
80 AC_CHECK_HEADERS([errno.h malloc.h memory.h unistd.h])
81 AC_CHECK_HEADERS([mach-o/dyld.h])
83 AC_CHECK_FUNCS([closedir opendir readdir])
87 # AC_LTDL_ENABLE_INSTALL
88 # ----------------------
89 AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
90 [AC_ARG_ENABLE([ltdl-install],
91 [AS_HELP_STRING([--enable-ltdl-install],[install libltdl])])
93 AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno)
94 AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno)
95 ])# AC_LTDL_ENABLE_INSTALL
98 # AC_LTDL_SYS_DLOPEN_DEPLIBS
99 # --------------------------
100 AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS],
101 [AC_REQUIRE([AC_CANONICAL_HOST])
102 AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
103 [libltdl_cv_sys_dlopen_deplibs],
104 [# PORTME does your system automatically load deplibs for dlopen?
105 # or its logical equivalent (e.g. shl_load for HP-UX < 11)
106 # For now, we just catch OSes we know something about -- in the
107 # future, we'll try test this programmatically.
108 libltdl_cv_sys_dlopen_deplibs=unknown
110 aix3*|aix4.1.*|aix4.2.*)
111 # Unknown whether this is true for these versions of AIX, but
112 # we want this `case' here to explicitly catch those versions.
113 libltdl_cv_sys_dlopen_deplibs=unknown
116 libltdl_cv_sys_dlopen_deplibs=yes
119 # Assuming the user has installed a libdl from somewhere, this is true
120 # If you are looking for one http://www.opendarwin.org/projects/dlcompat
121 libltdl_cv_sys_dlopen_deplibs=yes
123 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
124 # GNU and its variants, using gnu ld.so (Glibc)
125 libltdl_cv_sys_dlopen_deplibs=yes
128 libltdl_cv_sys_dlopen_deplibs=yes
131 libltdl_cv_sys_dlopen_deplibs=yes
133 irix[[12345]]*|irix6.[[01]]*)
134 # Catch all versions of IRIX before 6.2, and indicate that we don't
135 # know how it worked for any of those versions.
136 libltdl_cv_sys_dlopen_deplibs=unknown
139 # The case above catches anything before 6.2, and it's known that
140 # at 6.2 and later dlopen does load deplibs.
141 libltdl_cv_sys_dlopen_deplibs=yes
144 libltdl_cv_sys_dlopen_deplibs=yes
147 libltdl_cv_sys_dlopen_deplibs=yes
150 # dlopen did load deplibs (at least at 4.x), but until the 5.x series,
151 # it did *not* use an RPATH in a shared library to find objects the
152 # library depends on, so we explicitly say `no'.
153 libltdl_cv_sys_dlopen_deplibs=no
155 osf5.0|osf5.0a|osf5.1)
156 # dlopen *does* load deplibs and with the right loader patch applied
157 # it even uses RPATH in a shared library to search for shared objects
158 # that the library depends on, but there's no easy way to know if that
159 # patch is installed. Since this is the case, all we can really
160 # say is unknown -- it depends on the patch being installed. If
161 # it is, this changes to `yes'. Without it, it would be `no'.
162 libltdl_cv_sys_dlopen_deplibs=unknown
165 # the two cases above should catch all versions of osf <= 5.1. Read
166 # the comments above for what we know about them.
167 # At > 5.1, deplibs are loaded *and* any RPATH in a shared library
168 # is used to find them so we can finally say `yes'.
169 libltdl_cv_sys_dlopen_deplibs=yes
172 libltdl_cv_sys_dlopen_deplibs=yes
174 sysv5* | sco3.2v5* | sco5v6* | unixware* | OpenUNIX* | sysv4*uw2*)
175 libltdl_cv_sys_dlopen_deplibs=yes
179 if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
180 AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1],
181 [Define if the OS needs help to load dependent libraries for dlopen().])
183 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS
188 AC_DEFUN([AC_LTDL_SHLIBEXT],
189 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
190 AC_CACHE_CHECK([which extension is used for loadable modules],
191 [libltdl_cv_shlibext],
194 eval libltdl_cv_shlibext=$shrext_cmds
196 if test -n "$libltdl_cv_shlibext"; then
197 AC_DEFINE_UNQUOTED([LTDL_SHLIB_EXT], ["$libltdl_cv_shlibext"],
198 [Define to the extension used for shared libraries, say, ".so".])
202 # AC_LTDL_SYSSEARCHPATH
203 # ---------------------
204 AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
205 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
206 AC_CACHE_CHECK([for the default library search path],
207 [libltdl_cv_sys_search_path],
208 [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
209 if test -n "$libltdl_cv_sys_search_path"; then
211 for dir in $libltdl_cv_sys_search_path; do
212 if test -z "$sys_search_path"; then
213 sys_search_path="$dir"
215 sys_search_path="$sys_search_path$PATH_SEPARATOR$dir"
218 AC_DEFINE_UNQUOTED([LTDL_SYSSEARCHPATH], ["$sys_search_path"],
219 [Define to the system default library search path.])
221 ])# AC_LTDL_SYSSEARCHPATH
226 AC_DEFUN([AC_LTDL_OBJDIR],
227 [AC_CACHE_CHECK([for objdir],
229 [libltdl_cv_objdir="$objdir"
230 if test -n "$objdir"; then
233 rm -f .libs 2>/dev/null
234 mkdir .libs 2>/dev/null
235 if test -d .libs; then
236 libltdl_cv_objdir=.libs
238 # MS-DOS does not allow filenames that begin with a dot.
239 libltdl_cv_objdir=_libs
241 rmdir .libs 2>/dev/null
244 AC_DEFINE_UNQUOTED([LTDL_OBJDIR], ["$libltdl_cv_objdir/"],
245 [Define to the sub-directory in which libtool stores uninstalled libraries.])
251 AC_DEFUN([AC_LTDL_DLPREOPEN],
252 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
253 AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
254 [libltdl_cv_preloaded_symbols],
255 [if test -n "$lt_cv_sys_global_symbol_pipe"; then
256 libltdl_cv_preloaded_symbols=yes
258 libltdl_cv_preloaded_symbols=no
261 if test x"$libltdl_cv_preloaded_symbols" = xyes; then
262 AC_DEFINE([HAVE_PRELOADED_SYMBOLS], [1],
263 [Define if libtool can extract symbol lists from object files.])
265 ])# AC_LTDL_DLPREOPEN
270 AC_DEFUN([AC_LTDL_DLLIB],
275 AC_CHECK_FUNC([shl_load],
276 [AC_DEFINE([HAVE_SHL_LOAD], [1],
277 [Define if you have the shl_load function.])],
278 [AC_CHECK_LIB([dld], [shl_load],
279 [AC_DEFINE([HAVE_SHL_LOAD], [1],
280 [Define if you have the shl_load function.])
281 LIBADD_DL="$LIBADD_DL -ldld"],
282 [AC_CHECK_LIB([dl], [dlopen],
283 [AC_DEFINE([HAVE_LIBDL], [1],
284 [Define if you have the libdl library or equivalent.])
285 LIBADD_DL="-ldl" libltdl_cv_lib_dl_dlopen="yes"],
286 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#if HAVE_DLFCN_H
289 ]], [[dlopen(0, 0);]])],[AC_DEFINE([HAVE_LIBDL], [1],
290 [Define if you have the libdl library or equivalent.]) libltdl_cv_func_dlopen="yes"],[AC_CHECK_LIB([svld], [dlopen],
291 [AC_DEFINE([HAVE_LIBDL], [1],
292 [Define if you have the libdl library or equivalent.])
293 LIBADD_DL="-lsvld" libltdl_cv_func_dlopen="yes"],
294 [AC_CHECK_LIB([dld], [dld_link],
295 [AC_DEFINE([HAVE_DLD], [1],
296 [Define if you have the GNU dld library.])
297 LIBADD_DL="$LIBADD_DL -ldld"],
298 [AC_CHECK_FUNC([_dyld_func_lookup],
299 [AC_DEFINE([HAVE_DYLD], [1],
300 [Define if you have the _dyld_func_lookup function.])])
308 if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes
311 LIBS="$LIBS $LIBADD_DL"
312 AC_CHECK_FUNCS([dlerror])
319 # AC_LTDL_SYMBOL_USCORE
320 # ---------------------
321 # does the compiler prefix global symbols with an underscore?
322 AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
323 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
324 AC_CACHE_CHECK([for _ prefix in compiled symbols],
325 [ac_cv_sys_symbol_underscore],
326 [ac_cv_sys_symbol_underscore=no
327 cat > conftest.$ac_ext <<EOF
328 void nm_test_func(){}
329 int main(){nm_test_func;return 0;}
331 if AC_TRY_EVAL(ac_compile); then
332 # Now try to grab the symbols.
334 if AC_TRY_EVAL(NM conftest.$ac_objext \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
335 # See whether the symbols have a leading underscore.
336 if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
337 ac_cv_sys_symbol_underscore=yes
339 if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
342 echo "configure: cannot find nm_test_func in $ac_nlist" >&AS_MESSAGE_LOG_FD
346 echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AS_MESSAGE_LOG_FD
349 echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
350 cat conftest.c >&AS_MESSAGE_LOG_FD
354 ])# AC_LTDL_SYMBOL_USCORE
357 # AC_LTDL_DLSYM_USCORE
358 # --------------------
359 AC_DEFUN([AC_LTDL_DLSYM_USCORE],
360 [AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
361 if test x"$ac_cv_sys_symbol_underscore" = xyes; then
362 if test x"$libltdl_cv_func_dlopen" = xyes ||
363 test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
364 AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
365 [libltdl_cv_need_uscore],
366 [libltdl_cv_need_uscore=unknown
368 LIBS="$LIBS $LIBADD_DL"
369 _LT_AC_TRY_DLOPEN_SELF(
370 [libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
371 [], [libltdl_cv_need_uscore=cross])
377 if test x"$libltdl_cv_need_uscore" = xyes; then
378 AC_DEFINE([NEED_USCORE], [1],
379 [Define if dlsym() requires a leading underscore in symbol names.])
381 ])# AC_LTDL_DLSYM_USCORE
385 AC_DEFUN([AC_LTDL_FUNC_ARGZ],
386 [AC_CHECK_HEADERS([argz.h])
388 AC_CHECK_TYPES([error_t],
390 [AC_DEFINE([error_t], [int],
391 [Define to a type to use for `error_t' if it is not otherwise available.])],
396 AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify])
397 ])# AC_LTDL_FUNC_ARGZ