summaryrefslogtreecommitdiffstats
path: root/libltdl/ltdl.m4
blob: 6a53da1656c956ec02f419690e3ae8bfb6a282d6 (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
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
## ltdl.m4 - Configure ltdl for the target system. -*-Shell-script-*-
## Copyright (C) 1999, 2000, 2001 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 1 AC_LIB_LTDL

AC_DEFUN([AC_LIB_LTDL],
[AC_PREREQ(2.13)dnl
AC_REQUIRE([AC_PROG_CC])dnl
AC_REQUIRE([AC_C_CONST])dnl
AC_REQUIRE([AC_C_INLINE])dnl
AC_REQUIRE([AC_LIB_LTDL_COMMON])dnl
])

AC_DEFUN([KDE_LIB_LTDL],
[AC_PREREQ(2.13)dnl
AC_REQUIRE([AC_PROG_CC])dnl
AC_REQUIRE([AC_LIB_LTDL_COMMON])dnl
])

AC_DEFUN([AC_LIB_LTDL_COMMON],
[dnl
dnl AC_LIB_LTDL must perform all the checks necessary for compilation
dnl of the ltdl objects -- including compiler checks (above) and header
dnl checks (below).
AC_REQUIRE([AC_HEADER_STDC])dnl

AC_CHECK_HEADERS(malloc.h memory.h stdlib.h stdio.h ctype.h dlfcn.h dl.h dld.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(strcmp)

AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])dnl
AC_REQUIRE([AC_LTDL_SHLIBEXT])dnl
AC_REQUIRE([AC_LTDL_SHLIBPATH])dnl
AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])dnl
AC_REQUIRE([AC_LTDL_OBJDIR])dnl
AC_REQUIRE([AC_LTDL_DLPREOPEN])dnl
AC_REQUIRE([AC_LTDL_DLLIB])dnl
AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])dnl
AC_REQUIRE([AC_LTDL_DLSYM_USCORE])dnl
AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])dnl
])

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_DEFUN([AC_LTDL_SNARF_CONFIG],
[# Read the libtool configuration
rm -f conftest
./libtool --config > conftest
. ./conftest
rm -f conftest
])

# 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, [dnl
	# PORTME does your system automatically load deplibs for dlopen()?
	libltdl_cv_sys_dlopen_deplibs=unknown
	case "$host_os" in
	cygwin*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	darwin*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	linux*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	netbsd*|openbsd*|freebsd*|dragonfly*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	solaris*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	hpux*|irix*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	osf*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	esac
])
if test "$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_DEFUN([AC_LTDL_SHLIBEXT],
[AC_REQUIRE([AC_LTDL_SNARF_CONFIG])dnl
AC_CACHE_CHECK([which extension is used for shared libraries],
  libltdl_cv_shlibext, [dnl
(
  last=
	case "$host_os" in
    cygwin* | mingw*) 
      last=".dll" 
      ;;
    *)
      for spec in $library_names_spec; do
        last="$spec"
      done
      ;;
  esac
changequote(, )
  echo "$last" | sed 's/\[.*\]//;s/^[^.]*//;s/\$.*$//;s/\.$//' > conftest
changequote([, ])
)
libltdl_cv_shlibext=`cat conftest`
rm -f conftest
])
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_DEFUN([AC_LTDL_SHLIBPATH],
[AC_REQUIRE([AC_LTDL_SNARF_CONFIG])dnl
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_DEFUN([AC_LTDL_SYSSEARCHPATH],
[AC_REQUIRE([AC_LTDL_SNARF_CONFIG])dnl
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
  case "$host" in
  *-*-mingw*) pathsep=";" ;;
  *) pathsep=":" ;;
  esac
  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$pathsep$dir"
    fi
  done
  AC_DEFINE_UNQUOTED(LTDL_SYSSEARCHPATH, "$sys_search_path",
    [Define to the system default library search path. ])
fi
])

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

AC_DEFUN([AC_LTDL_DLLIB],
[LIBADD_DL=
AC_CHECK_LIB(dl, dlopen, [AC_DEFINE(HAVE_LIBDL, 1,
   [Define if you have the libdl library or equivalent. ]) LIBADD_DL="-ldl"],
[AC_CHECK_FUNC(dlopen, [AC_DEFINE(HAVE_LIBDL, 1,
   [Define if you have the libdl library or equivalent.])],
[AC_CHECK_LIB(svld, dlopen, [AC_DEFINE(HAVE_LIBDL, 1,
   [Define if you have the libdl library or equivalent.]) LIBADD_DL="-lsvld"]
)])])
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="$LIBADD_DL -ldld"])
])
AC_CHECK_LIB(dld, dld_link, [AC_DEFINE(HAVE_DLD, 1,
  [Define if you have the GNU dld library.])dnl
test "x$ac_cv_lib_dld_shl_load" = yes || LIBADD_DL="$LIBADD_DL -ldld"])
AC_SUBST(LIBADD_DL)

if test "x$ac_cv_func_dlopen" = xyes || test "x$ac_cv_lib_dl_dlopen" = xyes; then
 LIBS_SAVE="$LIBS"
 LIBS="$LIBS $LIBADD_DL"
 AC_CHECK_FUNCS(dlerror)
 LIBS="$LIBS_SAVE"
fi
])

AC_DEFUN([AC_LTDL_GLOBAL_SYMBOL_PIPE],
[dnl Check for command to grab the raw symbol name followed
dnl by C symbol name from nm.
AC_REQUIRE([AC_CANONICAL_HOST])dnl
AC_REQUIRE([AC_PROG_NM])dnl
# Check for command to grab the raw symbol name followed by C symbol from nm.
AC_MSG_CHECKING([command to parse $NM output])
AC_CACHE_VAL(ac_cv_sys_global_symbol_pipe,
[# These are sane defaults that work on at least a few old systems.
# {They come from Ultrix.  What could be older than Ultrix?!! ;)}

changequote(,)dnl
# Character class describing NM global symbol codes.
ac_symcode='[BCDEGRST]'

# Regexp to match symbols that can be accessed directly from C.
ac_sympat='\([_A-Za-z][_A-Za-z0-9]*\)'

# Transform the above into a raw symbol and a C symbol.
ac_symxfrm='\1 \2\3 \3'

# Transform an extracted symbol line into a proper C declaration
ac_global_symbol_to_cdecl="sed -n -e 's/^. .* \(.*\)$/extern char \1;/p'"

# Define system-specific variables.
case "$host_os" in
aix*)
  ac_symcode='[BCDT]'
  ;;
cygwin* | mingw*)
  ac_symcode='[ABCDGISTW]'
  ;;
hpux*)
  ac_global_symbol_to_cdecl="sed -n -e 's/^T .* \(.*\)$/extern char \1();/p' -e 's/^. .* \(.*\)$/extern char \1;/p'"
  ;;
irix*)
  ac_symcode='[BCDEGRST]'
  ;;
solaris*)
  ac_symcode='[BDT]'
  ;;
esac

# If we're using GNU nm, then use its standard symbol codes.
if $NM -V 2>&1 | egrep '(GNU|with BFD)' > /dev/null; then
  ac_symcode='[ABCDGISTW]'
fi
changequote([,])dnl

# Try without a prefix undercore, then with it.
for ac_symprfx in "" "_"; do

  ac_cv_sys_global_symbol_pipe="sed -n -e 's/^.*[ 	]\($ac_symcode\)[ 	][ 	]*\($ac_symprfx\)$ac_sympat$/$ac_symxfrm/p'"

  # Check to see that the pipe works correctly.
  ac_pipe_works=no
  rm -f conftest.$ac_ext
  cat > conftest.$ac_ext <<EOF
#ifdef __cplusplus
extern "C" {
#endif
char nm_test_var;
void nm_test_func(){}
#ifdef __cplusplus
}
#endif
int main(){nm_test_var='a';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 \| $ac_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then

      # Try sorting and uniquifying the output.
      if sort "$ac_nlist" | uniq > "$ac_nlist"T; then
	mv -f "$ac_nlist"T "$ac_nlist"
      else
	rm -f "$ac_nlist"T
      fi

      # Make sure that we snagged all the symbols we need.
      if egrep ' nm_test_var$' "$ac_nlist" >/dev/null; then
	if egrep ' nm_test_func$' "$ac_nlist" >/dev/null; then
	  cat <<EOF > conftest.$ac_ext
#ifdef __cplusplus
extern "C" {
#endif

EOF
	  # Now generate the symbol file.
	  eval "$ac_global_symbol_to_cdecl"' < "$ac_nlist" >> conftest.$ac_ext'

	  cat <<EOF >> conftest.$ac_ext
#if defined (__STDC__) && __STDC__
# define lt_ptr_t void *
#else
# define lt_ptr_t char *
# define const
#endif

/* The mapping between symbol names and symbols. */
const struct {
  const char *name;
  lt_ptr_t address;
}
changequote(,)dnl
lt_preloaded_symbols[] =
changequote([,])dnl
{
EOF
	sed 's/^. \(.*\) \(.*\)$/  {"\2", (lt_ptr_t) \&\2},/' <	"$ac_nlist" >> conftest.$ac_ext
	cat <<\EOF >> conftest.$ac_ext
  {0, (lt_ptr_t) 0}
};

#ifdef __cplusplus
}
#endif
EOF
	  # Now try linking the two files.
	  mv conftest.$ac_objext conftstm.$ac_objext
	  ac_save_LIBS="$LIBS"
	  ac_save_CFLAGS="$CFLAGS"
	  LIBS="conftstm.$ac_objext"
	  CFLAGS="$CFLAGS$no_builtin_flag"
	  if AC_TRY_EVAL(ac_link) && test -s conftest; then
	    ac_pipe_works=yes
	  else
	    echo "configure: failed program was:" >&AC_FD_CC
	    cat conftest.$ac_ext >&AC_FD_CC
	  fi
	  LIBS="$ac_save_LIBS"
	  CFLAGS="$ac_save_CFLAGS"
	else
	  echo "cannot find nm_test_func in $ac_nlist" >&AC_FD_CC
	fi
      else
	echo "cannot find nm_test_var in $ac_nlist" >&AC_FD_CC
      fi
    else
      echo "cannot run $ac_cv_sys_global_symbol_pipe" >&AC_FD_CC
    fi
  else
    echo "$progname: failed program was:" >&AC_FD_CC
    cat conftest.$ac_ext >&AC_FD_CC
  fi
  rm -rf conftest* conftst*

  # Do not use the global_symbol_pipe unless it works.
  if test "$ac_pipe_works" = yes; then
    if test x"$ac_symprfx" = x"_"; then
      ac_cv_sys_symbol_underscore=yes
    else
      ac_cv_sys_symbol_underscore=no
    fi
    break
  else
    ac_cv_sys_global_symbol_pipe=
  fi
done
])

ac_result=yes
if test -z "$ac_cv_sys_global_symbol_pipe"; then
   ac_result=no
fi
AC_MSG_RESULT($ac_result)
])

AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
[dnl does the compiler prefix global symbols with an underscore?
AC_REQUIRE([AC_LTDL_GLOBAL_SYMBOL_PIPE])dnl
AC_MSG_CHECKING([for _ prefix in compiled symbols])
AC_CACHE_VAL(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 \| $ac_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
    # See whether the symbols have a leading underscore.
    if egrep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
      ac_cv_sys_symbol_underscore=yes
    else
      if egrep '^. nm_test_func ' "$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 $ac_cv_sys_global_symbol_pipe" >&AC_FD_CC
  fi
else
  echo "configure: failed program was:" >&AC_FD_CC
  cat conftest.$ac_ext >&AC_FD_CC
fi
rm -rf conftest*
])
AC_MSG_RESULT($ac_cv_sys_symbol_underscore)
])

AC_DEFUN([AC_LTDL_DLSYM_USCORE],
[AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])dnl
if test x"$ac_cv_sys_symbol_underscore" = xyes; then
  if test x"$ac_cv_func_dlopen" = xyes ||
     test x"$ac_cv_lib_dl_dlopen" = xyes ; then
	AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
		libltdl_cv_need_uscore, [dnl
		AC_TRY_RUN([
#if HAVE_DLFCN_H
#include <dlfcn.h>
#endif

#include <stdio.h>

#ifdef RTLD_GLOBAL
# define LTDL_GLOBAL	RTLD_GLOBAL
#else
# ifdef DL_GLOBAL
#  define LTDL_GLOBAL	DL_GLOBAL
# else
#  define LTDL_GLOBAL	0
# endif
#endif

/* We may have to define LTDL_LAZY_OR_NOW in the command line if we
   find out it does not work in some platform. */
#ifndef LTDL_LAZY_OR_NOW
# ifdef RTLD_LAZY
#  define LTDL_LAZY_OR_NOW	RTLD_LAZY
# else
#  ifdef DL_LAZY
#   define LTDL_LAZY_OR_NOW	DL_LAZY
#  else
#   ifdef RTLD_NOW
#    define LTDL_LAZY_OR_NOW	RTLD_NOW
#   else
#    ifdef DL_NOW
#     define LTDL_LAZY_OR_NOW	DL_NOW
#    else
#     define LTDL_LAZY_OR_NOW	0
#    endif
#   endif
#  endif
# endif
#endif

void fnord() { int i=42;}
int main() {
    void *self, *ptr1, *ptr2; self=dlopen(0,LTDL_GLOBAL|LTDL_LAZY_OR_NOW);
    if(self) { ptr1=dlsym(self,"fnord"); ptr2=dlsym(self,"_fnord");
	       if(ptr1 && !ptr2) { dlclose(self); exit(0); } } exit(1); }
],	libltdl_cv_need_uscore=no, libltdl_cv_need_uscore=yes,
	libltdl_cv_need_uscore=cross
)])
  fi
fi

case "$host_os" in
  cygwin* | mingw*) 
    libltdl_cv_need_uscore=no
    ;;
esac
if test x"$libltdl_cv_need_uscore" = xyes; then
  AC_DEFINE(NEED_USCORE, 1,
    [Define if dlsym() requires a leading underscode in symbol names. ])
fi
])