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([assert.h ctype.h errno.h malloc.h memory.h stdlib.h \
82 AC_CHECK_HEADERS([dl.h sys/dl.h dld.h mach-o/dyld.h])
83 AC_CHECK_HEADERS([string.h strings.h], [break])
85 AC_CHECK_FUNCS([strchr index], [break])
86 AC_CHECK_FUNCS([strrchr rindex], [break])
87 AC_CHECK_FUNCS([memcpy bcopy], [break])
88 AC_CHECK_FUNCS([memmove strcmp])
89 AC_CHECK_FUNCS([closedir opendir readdir])
93 # AC_LTDL_ENABLE_INSTALL
94 # ----------------------
95 AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
96 [AC_ARG_ENABLE([ltdl-install],
97 [AS_HELP_STRING([--enable-ltdl-install],[install libltdl])])
99 AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno)
100 AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno)
101 ])# AC_LTDL_ENABLE_INSTALL
104 # AC_LTDL_SYS_DLOPEN_DEPLIBS
105 # --------------------------
106 AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS],
107 [AC_REQUIRE([AC_CANONICAL_HOST])
108 AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
109 [libltdl_cv_sys_dlopen_deplibs],
110 [# PORTME does your system automatically load deplibs for dlopen?
111 # or its logical equivalent (e.g. shl_load for HP-UX < 11)
112 # For now, we just catch OSes we know something about -- in the
113 # future, we'll try test this programmatically.
114 libltdl_cv_sys_dlopen_deplibs=unknown
116 aix3*|aix4.1.*|aix4.2.*)
117 # Unknown whether this is true for these versions of AIX, but
118 # we want this `case' here to explicitly catch those versions.
119 libltdl_cv_sys_dlopen_deplibs=unknown
122 libltdl_cv_sys_dlopen_deplibs=yes
125 # Assuming the user has installed a libdl from somewhere, this is true
126 # If you are looking for one http://www.opendarwin.org/projects/dlcompat
127 libltdl_cv_sys_dlopen_deplibs=yes
129 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
130 # GNU and its variants, using gnu ld.so (Glibc)
131 libltdl_cv_sys_dlopen_deplibs=yes
134 libltdl_cv_sys_dlopen_deplibs=yes
137 libltdl_cv_sys_dlopen_deplibs=yes
139 irix[[12345]]*|irix6.[[01]]*)
140 # Catch all versions of IRIX before 6.2, and indicate that we don't
141 # know how it worked for any of those versions.
142 libltdl_cv_sys_dlopen_deplibs=unknown
145 # The case above catches anything before 6.2, and it's known that
146 # at 6.2 and later dlopen does load deplibs.
147 libltdl_cv_sys_dlopen_deplibs=yes
150 libltdl_cv_sys_dlopen_deplibs=yes
153 libltdl_cv_sys_dlopen_deplibs=yes
156 # dlopen did load deplibs (at least at 4.x), but until the 5.x series,
157 # it did *not* use an RPATH in a shared library to find objects the
158 # library depends on, so we explicitly say `no'.
159 libltdl_cv_sys_dlopen_deplibs=no
161 osf5.0|osf5.0a|osf5.1)
162 # dlopen *does* load deplibs and with the right loader patch applied
163 # it even uses RPATH in a shared library to search for shared objects
164 # that the library depends on, but there's no easy way to know if that
165 # patch is installed. Since this is the case, all we can really
166 # say is unknown -- it depends on the patch being installed. If
167 # it is, this changes to `yes'. Without it, it would be `no'.
168 libltdl_cv_sys_dlopen_deplibs=unknown
171 # the two cases above should catch all versions of osf <= 5.1. Read
172 # the comments above for what we know about them.
173 # At > 5.1, deplibs are loaded *and* any RPATH in a shared library
174 # is used to find them so we can finally say `yes'.
175 libltdl_cv_sys_dlopen_deplibs=yes
178 libltdl_cv_sys_dlopen_deplibs=yes
180 sysv5* | sco3.2v5* | sco5v6* | unixware* | OpenUNIX* | sysv4*uw2*)
181 libltdl_cv_sys_dlopen_deplibs=yes
185 if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
186 AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1],
187 [Define if the OS needs help to load dependent libraries for dlopen().])
189 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS
194 AC_DEFUN([AC_LTDL_SHLIBEXT],
195 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
196 AC_CACHE_CHECK([which extension is used for loadable modules],
197 [libltdl_cv_shlibext],
200 eval libltdl_cv_shlibext=$shrext_cmds
202 if test -n "$libltdl_cv_shlibext"; then
203 AC_DEFINE_UNQUOTED([LTDL_SHLIB_EXT], ["$libltdl_cv_shlibext"],
204 [Define to the extension used for shared libraries, say, ".so".])
208 # AC_LTDL_SYSSEARCHPATH
209 # ---------------------
210 AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
211 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
212 AC_CACHE_CHECK([for the default library search path],
213 [libltdl_cv_sys_search_path],
214 [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
215 if test -n "$libltdl_cv_sys_search_path"; then
217 for dir in $libltdl_cv_sys_search_path; do
218 if test -z "$sys_search_path"; then
219 sys_search_path="$dir"
221 sys_search_path="$sys_search_path$PATH_SEPARATOR$dir"
224 AC_DEFINE_UNQUOTED([LTDL_SYSSEARCHPATH], ["$sys_search_path"],
225 [Define to the system default library search path.])
227 ])# AC_LTDL_SYSSEARCHPATH
232 AC_DEFUN([AC_LTDL_OBJDIR],
233 [AC_CACHE_CHECK([for objdir],
235 [libltdl_cv_objdir="$objdir"
236 if test -n "$objdir"; then
239 rm -f .libs 2>/dev/null
240 mkdir .libs 2>/dev/null
241 if test -d .libs; then
242 libltdl_cv_objdir=.libs
244 # MS-DOS does not allow filenames that begin with a dot.
245 libltdl_cv_objdir=_libs
247 rmdir .libs 2>/dev/null
250 AC_DEFINE_UNQUOTED([LTDL_OBJDIR], ["$libltdl_cv_objdir/"],
251 [Define to the sub-directory in which libtool stores uninstalled libraries.])
257 AC_DEFUN([AC_LTDL_DLPREOPEN],
258 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
259 AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
260 [libltdl_cv_preloaded_symbols],
261 [if test -n "$lt_cv_sys_global_symbol_pipe"; then
262 libltdl_cv_preloaded_symbols=yes
264 libltdl_cv_preloaded_symbols=no
267 if test x"$libltdl_cv_preloaded_symbols" = xyes; then
268 AC_DEFINE([HAVE_PRELOADED_SYMBOLS], [1],
269 [Define if libtool can extract symbol lists from object files.])
271 ])# AC_LTDL_DLPREOPEN
276 AC_DEFUN([AC_LTDL_DLLIB],
281 AC_CHECK_FUNC([shl_load],
282 [AC_DEFINE([HAVE_SHL_LOAD], [1],
283 [Define if you have the shl_load function.])],
284 [AC_CHECK_LIB([dld], [shl_load],
285 [AC_DEFINE([HAVE_SHL_LOAD], [1],
286 [Define if you have the shl_load function.])
287 LIBADD_DL="$LIBADD_DL -ldld"],
288 [AC_CHECK_LIB([dl], [dlopen],
289 [AC_DEFINE([HAVE_LIBDL], [1],
290 [Define if you have the libdl library or equivalent.])
291 LIBADD_DL="-ldl" libltdl_cv_lib_dl_dlopen="yes"],
292 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#if HAVE_DLFCN_H
295 ]], [[dlopen(0, 0);]])],[AC_DEFINE([HAVE_LIBDL], [1],
296 [Define if you have the libdl library or equivalent.]) libltdl_cv_func_dlopen="yes"],[AC_CHECK_LIB([svld], [dlopen],
297 [AC_DEFINE([HAVE_LIBDL], [1],
298 [Define if you have the libdl library or equivalent.])
299 LIBADD_DL="-lsvld" libltdl_cv_func_dlopen="yes"],
300 [AC_CHECK_LIB([dld], [dld_link],
301 [AC_DEFINE([HAVE_DLD], [1],
302 [Define if you have the GNU dld library.])
303 LIBADD_DL="$LIBADD_DL -ldld"],
304 [AC_CHECK_FUNC([_dyld_func_lookup],
305 [AC_DEFINE([HAVE_DYLD], [1],
306 [Define if you have the _dyld_func_lookup function.])])
314 if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes
317 LIBS="$LIBS $LIBADD_DL"
318 AC_CHECK_FUNCS([dlerror])
325 # AC_LTDL_SYMBOL_USCORE
326 # ---------------------
327 # does the compiler prefix global symbols with an underscore?
328 AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
329 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
330 AC_CACHE_CHECK([for _ prefix in compiled symbols],
331 [ac_cv_sys_symbol_underscore],
332 [ac_cv_sys_symbol_underscore=no
333 cat > conftest.$ac_ext <<EOF
334 void nm_test_func(){}
335 int main(){nm_test_func;return 0;}
337 if AC_TRY_EVAL(ac_compile); then
338 # Now try to grab the symbols.
340 if AC_TRY_EVAL(NM conftest.$ac_objext \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
341 # See whether the symbols have a leading underscore.
342 if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
343 ac_cv_sys_symbol_underscore=yes
345 if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
348 echo "configure: cannot find nm_test_func in $ac_nlist" >&AS_MESSAGE_LOG_FD
352 echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AS_MESSAGE_LOG_FD
355 echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
356 cat conftest.c >&AS_MESSAGE_LOG_FD
360 ])# AC_LTDL_SYMBOL_USCORE
363 # AC_LTDL_DLSYM_USCORE
364 # --------------------
365 AC_DEFUN([AC_LTDL_DLSYM_USCORE],
366 [AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
367 if test x"$ac_cv_sys_symbol_underscore" = xyes; then
368 if test x"$libltdl_cv_func_dlopen" = xyes ||
369 test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
370 AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
371 [libltdl_cv_need_uscore],
372 [libltdl_cv_need_uscore=unknown
374 LIBS="$LIBS $LIBADD_DL"
375 _LT_AC_TRY_DLOPEN_SELF(
376 [libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
377 [], [libltdl_cv_need_uscore=cross])
383 if test x"$libltdl_cv_need_uscore" = xyes; then
384 AC_DEFINE([NEED_USCORE], [1],
385 [Define if dlsym() requires a leading underscore in symbol names.])
387 ])# AC_LTDL_DLSYM_USCORE
391 AC_DEFUN([AC_LTDL_FUNC_ARGZ],
392 [AC_CHECK_HEADERS([argz.h])
394 AC_CHECK_TYPES([error_t],
396 [AC_DEFINE([error_t], [int],
397 [Define to a type to use for `error_t' if it is not otherwise available.])],
402 AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify])
403 ])# AC_LTDL_FUNC_ARGZ