summaryrefslogtreecommitdiffstats
path: root/ltdl.m4
blob: aa6a0d1345d81259bcdba8723ce2502ee0f630df (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
## ltdl.m4 - Configure ltdl for the target system. -*-Autoconf-*-
## Copyright (C) 1999-2000 Free Software Foundation, Inc.
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
##
## As a special exception to the GNU General Public License, if you
## distribute this file as part of a program that contains a
## configuration script generated by Autoconf, you may include it under
## the same distribution terms that you use for the rest of that program.

# serial 6 AC_LIB_LTDL
# Debian $Rev: 214 $

# AC_WITH_LTDL
# ------------
# Clients of libltdl can use this macro to allow the installer to
# choose between a shipped copy of the ltdl sources or a preinstalled
# version of the library.
AC_DEFUN([AC_WITH_LTDL],
[AC_REQUIRE([AC_LIB_LTDL])
AC_SUBST([LIBLTDL])
AC_SUBST([INCLTDL])

# Unless the user asks us to check, assume no installed ltdl exists.
use_installed_libltdl=no

AC_ARG_WITH([included_ltdl],
    [  --with-included-ltdl    use the GNU ltdl sources included here])

if test "x$with_included_ltdl" != xyes; then
  # We are not being forced to use the included libltdl sources, so
  # decide whether there is a useful installed version we can use.
  AC_CHECK_HEADER([ltdl.h],
      [AC_CHECK_LIB([ltdl], [lt_dlcaller_register],
          [with_included_ltdl=no],
          [with_included_ltdl=yes])
  ])
fi

if test "x$enable_ltdl_install" != xyes; then
  # If the user did not specify an installable libltdl, then default
  # to a convenience lib.
  AC_LIBLTDL_CONVENIENCE
fi

if test "x$with_included_ltdl" = xno; then
  # If the included ltdl is not to be used. then Use the
  # preinstalled libltdl we found.
  AC_DEFINE([HAVE_LTDL], 1,
    [Define this if a modern libltdl is already installed])
  LIBLTDL=-lltdl
fi

# Report our decision...
AC_MSG_CHECKING([whether to use included libltdl])
AC_MSG_RESULT([$with_included_ltdl])

AC_CONFIG_SUBDIRS([libltdl])
])# AC_WITH_LTDL


# AC_LIB_LTDL
# -----------
# Perform all the checks necessary for compilation of the ltdl objects
#  -- including compiler checks and header checks.
AC_DEFUN([AC_LIB_LTDL],
[AC_PREREQ(2.50)
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_C_CONST])
AC_REQUIRE([AC_HEADER_STDC])
AC_REQUIRE([AC_HEADER_DIRENT])
AC_REQUIRE([_LT_AC_CHECK_DLFCN])
AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])
AC_REQUIRE([AC_LTDL_SHLIBEXT])
AC_REQUIRE([AC_LTDL_SHLIBPATH])
AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])
AC_REQUIRE([AC_LTDL_OBJDIR])
AC_REQUIRE([AC_LTDL_DLPREOPEN])
AC_REQUIRE([AC_LTDL_DLLIB])
AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
AC_REQUIRE([AC_LTDL_DLSYM_USCORE])
AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])
AC_REQUIRE([AC_LTDL_FUNC_ARGZ])

AC_CHECK_HEADERS([assert.h ctype.h errno.h malloc.h memory.h stdlib.h \
		  stdio.h unistd.h])
AC_CHECK_HEADERS([dl.h sys/dl.h dld.h mach-o/dyld.h])
AC_CHECK_HEADERS([string.h strings.h], [break])

AC_CHECK_FUNCS([strchr index], [break])
AC_CHECK_FUNCS([strrchr rindex], [break])
AC_CHECK_FUNCS([memcpy bcopy], [break])
AC_CHECK_FUNCS([memmove strcmp])
AC_CHECK_FUNCS([closedir opendir readdir])
])# AC_LIB_LTDL


# AC_LTDL_ENABLE_INSTALL
# ----------------------
AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
[AC_ARG_ENABLE([ltdl-install],
    [AC_HELP_STRING([--enable-ltdl-install], [install libltdl])])

AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno)
AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno)
])])# AC_LTDL_ENABLE_INSTALL


# AC_LTDL_SYS_DLOPEN_DEPLIBS
# --------------------------
AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS],
[AC_REQUIRE([AC_CANONICAL_HOST])
AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
  [libltdl_cv_sys_dlopen_deplibs],
  [# PORTME does your system automatically load deplibs for dlopen?
  # or its logical equivalent (e.g. shl_load for HP-UX < 11)
  # For now, we just catch OSes we know something about -- in the
  # future, we'll try test this programmatically.
  libltdl_cv_sys_dlopen_deplibs=unknown
  case "$host_os" in
  aix3*|aix4.1.*|aix4.2.*)
    # Unknown whether this is true for these versions of AIX, but
    # we want this `case' here to explicitly catch those versions.
    libltdl_cv_sys_dlopen_deplibs=unknown
    ;;
  aix[[45]]*)
    libltdl_cv_sys_dlopen_deplibs=yes
    ;;
  darwin*)
    # Assuming the user has installed a libdl from somewhere, this is true
    # If you are looking for one http://www.opendarwin.org/projects/dlcompat
    libltdl_cv_sys_dlopen_deplibs=yes
    ;;   
  gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
    # GNU and its variants, using gnu ld.so (Glibc)
    libltdl_cv_sys_dlopen_deplibs=yes
    ;;
  hpux10*|hpux11*)
    libltdl_cv_sys_dlopen_deplibs=yes
    ;;
  irix[[12345]]*|irix6.[[01]]*)
    # Catch all versions of IRIX before 6.2, and indicate that we don't
    # know how it worked for any of those versions.
    libltdl_cv_sys_dlopen_deplibs=unknown
    ;;
  irix*)
    # The case above catches anything before 6.2, and it's known that
    # at 6.2 and later dlopen does load deplibs.
    libltdl_cv_sys_dlopen_deplibs=yes
    ;;
  netbsd* | netbsdelf*-gnu)
    libltdl_cv_sys_dlopen_deplibs=yes
    ;;
  openbsd*)
    libltdl_cv_sys_dlopen_deplibs=yes
    ;;
  osf[[1234]]*)
    # dlopen did load deplibs (at least at 4.x), but until the 5.x series,
    # it did *not* use an RPATH in a shared library to find objects the
    # library depends on, so we explictly say `no'.
    libltdl_cv_sys_dlopen_deplibs=no
    ;;
  osf5.0|osf5.0a|osf5.1)
    # dlopen *does* load deplibs and with the right loader patch applied
    # it even uses RPATH in a shared library to search for shared objects
    # that the library depends on, but there's no easy way to know if that
    # patch is installed.  Since this is the case, all we can really
    # say is unknown -- it depends on the patch being installed.  If
    # it is, this changes to `yes'.  Without it, it would be `no'.
    libltdl_cv_sys_dlopen_deplibs=unknown
    ;;
  osf*)
    # the two cases above should catch all versions of osf <= 5.1.  Read
    # the comments above for what we know about them.
    # At > 5.1, deplibs are loaded *and* any RPATH in a shared library
    # is used to find them so we can finally say `yes'.
    libltdl_cv_sys_dlopen_deplibs=yes
    ;;
  solaris*)
    libltdl_cv_sys_dlopen_deplibs=yes
    ;;
  esac
  ])
if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
 AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1],
    [Define if the OS needs help to load dependent libraries for dlopen().])
fi
])# AC_LTDL_SYS_DLOPEN_DEPLIBS


# AC_LTDL_SHLIBEXT
# ----------------
AC_DEFUN([AC_LTDL_SHLIBEXT],
[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
AC_CACHE_CHECK([which extension is used for loadable modules],
  [libltdl_cv_shlibext],
[
module=yes
eval libltdl_cv_shlibext=$shrext_cmds
  ])
if test -n "$libltdl_cv_shlibext"; then
  AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",
    [Define to the extension used for shared libraries, say, ".so".])
fi
])# AC_LTDL_SHLIBEXT


# AC_LTDL_SHLIBPATH
# -----------------
AC_DEFUN([AC_LTDL_SHLIBPATH],
[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
AC_CACHE_CHECK([which variable specifies run-time library path],
  [libltdl_cv_shlibpath_var], [libltdl_cv_shlibpath_var="$shlibpath_var"])
if test -n "$libltdl_cv_shlibpath_var"; then
  AC_DEFINE_UNQUOTED(LTDL_SHLIBPATH_VAR, "$libltdl_cv_shlibpath_var",
    [Define to the name of the environment variable that determines the dynamic library search path.])
fi
])# AC_LTDL_SHLIBPATH


# AC_LTDL_SYSSEARCHPATH
# ---------------------
AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
AC_CACHE_CHECK([for the default library search path],
  [libltdl_cv_sys_search_path],
  [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
if test -n "$libltdl_cv_sys_search_path"; then
  sys_search_path=
  for dir in $libltdl_cv_sys_search_path; do
    if test -z "$sys_search_path"; then
      sys_search_path="$dir"
    else
      sys_search_path="$sys_search_path$PATH_SEPARATOR$dir"
    fi
  done
  AC_DEFINE_UNQUOTED(LTDL_SYSSEARCHPATH, "$sys_search_path",
    [Define to the system default library search path.])
fi
])# AC_LTDL_SYSSEARCHPATH


# AC_LTDL_OBJDIR
# --------------
AC_DEFUN([AC_LTDL_OBJDIR],
[AC_CACHE_CHECK([for objdir],
  [libltdl_cv_objdir],
  [libltdl_cv_objdir="$objdir"
  if test -n "$objdir"; then
    :
  else
    rm -f .libs 2>/dev/null
    mkdir .libs 2>/dev/null
    if test -d .libs; then
      libltdl_cv_objdir=.libs
    else
      # MS-DOS does not allow filenames that begin with a dot.
      libltdl_cv_objdir=_libs
    fi
  rmdir .libs 2>/dev/null
  fi
  ])
AC_DEFINE_UNQUOTED(LTDL_OBJDIR, "$libltdl_cv_objdir/",
  [Define to the sub-directory in which libtool stores uninstalled libraries.])
])# AC_LTDL_OBJDIR


# AC_LTDL_DLPREOPEN
# -----------------
AC_DEFUN([AC_LTDL_DLPREOPEN],
[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
  [libltdl_cv_preloaded_symbols],
  [if test -n "$lt_cv_sys_global_symbol_pipe"; then
    libltdl_cv_preloaded_symbols=yes
  else
    libltdl_cv_preloaded_symbols=no
  fi
  ])
if test x"$libltdl_cv_preloaded_symbols" = xyes; then
  AC_DEFINE(HAVE_PRELOADED_SYMBOLS, 1,
    [Define if libtool can extract symbol lists from object files.])
fi
])# AC_LTDL_DLPREOPEN


# AC_LTDL_DLLIB
# -------------
AC_DEFUN([AC_LTDL_DLLIB],
[LIBADD_DL=
AC_SUBST(LIBADD_DL)
AC_LANG_PUSH([C])

AC_CHECK_FUNC([shl_load],
      [AC_DEFINE([HAVE_SHL_LOAD], [1],
		 [Define if you have the shl_load function.])],
  [AC_CHECK_LIB([dld], [shl_load],
	[AC_DEFINE([HAVE_SHL_LOAD], [1],
		   [Define if you have the shl_load function.])
	LIBADD_DL="$LIBADD_DL -ldld"],
    [AC_CHECK_LIB([dl], [dlopen],
	  [AC_DEFINE([HAVE_LIBDL], [1],
		     [Define if you have the libdl library or equivalent.])
	        LIBADD_DL="-ldl" libltdl_cv_lib_dl_dlopen="yes"],
      [AC_TRY_LINK([#if HAVE_DLFCN_H
#  include <dlfcn.h>
#endif
      ],
	[dlopen(0, 0);],
	    [AC_DEFINE([HAVE_LIBDL], [1],
		             [Define if you have the libdl library or equivalent.]) libltdl_cv_func_dlopen="yes"],
	[AC_CHECK_LIB([svld], [dlopen],
	      [AC_DEFINE([HAVE_LIBDL], [1],
			 [Define if you have the libdl library or equivalent.])
	            LIBADD_DL="-lsvld" libltdl_cv_func_dlopen="yes"],
	  [AC_CHECK_LIB([dld], [dld_link],
	        [AC_DEFINE([HAVE_DLD], [1],
			   [Define if you have the GNU dld library.])
	 	LIBADD_DL="$LIBADD_DL -ldld"],
	 	[AC_CHECK_FUNC([_dyld_func_lookup],
	 	       [AC_DEFINE([HAVE_DYLD], [1],
	 	          [Define if you have the _dyld_func_lookup function.])])
          ])
        ])
      ])
    ])
  ])
])

if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes
then
  lt_save_LIBS="$LIBS"
  LIBS="$LIBS $LIBADD_DL"
  AC_CHECK_FUNCS([dlerror])
  LIBS="$lt_save_LIBS"
fi
AC_LANG_POP
])# AC_LTDL_DLLIB


# AC_LTDL_SYMBOL_USCORE
# ---------------------
# does the compiler prefix global symbols with an underscore?
AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
AC_CACHE_CHECK([for _ prefix in compiled symbols],
  [ac_cv_sys_symbol_underscore],
  [ac_cv_sys_symbol_underscore=no
  cat > conftest.$ac_ext <<EOF
void nm_test_func(){}
int main(){nm_test_func;return 0;}
EOF
  if AC_TRY_EVAL(ac_compile); then
    # Now try to grab the symbols.
    ac_nlist=conftest.nm
    if AC_TRY_EVAL(NM conftest.$ac_objext \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
      # See whether the symbols have a leading underscore.
      if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
        ac_cv_sys_symbol_underscore=yes
      else
        if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
	  :
        else
	  echo "configure: cannot find nm_test_func in $ac_nlist" >&AC_FD_CC
        fi
      fi
    else
      echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AC_FD_CC
    fi
  else
    echo "configure: failed program was:" >&AC_FD_CC
    cat conftest.c >&AC_FD_CC
  fi
  rm -rf conftest*
  ])
])# AC_LTDL_SYMBOL_USCORE


# AC_LTDL_DLSYM_USCORE
# --------------------
AC_DEFUN([AC_LTDL_DLSYM_USCORE],
[AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
if test x"$ac_cv_sys_symbol_underscore" = xyes; then
  if test x"$libltdl_cv_func_dlopen" = xyes ||
     test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
	AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
	  [libltdl_cv_need_uscore],
	  [libltdl_cv_need_uscore=unknown
          save_LIBS="$LIBS"
          LIBS="$LIBS $LIBADD_DL"
	  _LT_AC_TRY_DLOPEN_SELF(
	    [libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
	    [],				 [libltdl_cv_need_uscore=cross])
	  LIBS="$save_LIBS"
	])
  fi
fi

if test x"$libltdl_cv_need_uscore" = xyes; then
  AC_DEFINE(NEED_USCORE, 1,
    [Define if dlsym() requires a leading underscore in symbol names.])
fi
])# AC_LTDL_DLSYM_USCORE

# AC_LTDL_FUNC_ARGZ
# -----------------
AC_DEFUN([AC_LTDL_FUNC_ARGZ],
[AC_CHECK_HEADERS([argz.h])

AC_CHECK_TYPES([error_t],
  [],
  [AC_DEFINE([error_t], [int],
    [Define to a type to use for `error_t' if it is not otherwise available.])],
  [#if HAVE_ARGZ_H
#  include <argz.h>
#endif])

AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify])
])# AC_LTDL_FUNC_ARGZ