1 ## ltdl.m4 - Configure ltdl for the target system. -*-Autoconf-*- 2 ## Copyright (C) 1999-2000 Free Software Foundation, Inc. 3 ## 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. 7 8 # serial 7 AC_LIB_LTDL 9 10 # AC_WITH_LTDL 11 # ------------ 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]) 17 AC_SUBST([LIBLTDL]) 18 AC_SUBST([INCLTDL]) 19 20 # Unless the user asks us to check, assume no installed ltdl exists. 21 use_installed_libltdl=no 22 23 AC_ARG_WITH([included_ltdl], 24 [ --with-included-ltdl use the GNU ltdl sources included here]) 25 26 if test "x$with_included_ltdl" != xyes; then 27 # We are not being forced to use the included libltdl sources, so 28 # decide whether there is a useful installed version we can use. 29 AC_CHECK_HEADER([ltdl.h], 30 [AC_CHECK_LIB([ltdl], [lt_dlcaller_register], 31 [with_included_ltdl=no], 32 [with_included_ltdl=yes]) 33 ]) 34 fi 35 36 if test "x$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 40 fi 41 42 if test "x$with_included_ltdl" = xno; then 43 # If the included ltdl is not to be used. then Use the 44 # preinstalled libltdl we found. 45 AC_DEFINE([HAVE_LTDL], [1], 46 [Define this if a modern libltdl is already installed]) 47 LIBLTDL=-lltdl 48 fi 49 50 # Report our decision... 51 AC_MSG_CHECKING([whether to use included libltdl]) 52 AC_MSG_RESULT([$with_included_ltdl]) 53 54 AC_CONFIG_SUBDIRS([libltdl]) 55 ])# AC_WITH_LTDL 56 57 58 # AC_LIB_LTDL 59 # ----------- 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], 63 [AC_PREREQ(2.60) 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_SHLIBPATH]) 72 AC_REQUIRE([AC_LTDL_SYSSEARCHPATH]) 73 AC_REQUIRE([AC_LTDL_OBJDIR]) 74 AC_REQUIRE([AC_LTDL_DLPREOPEN]) 75 AC_REQUIRE([AC_LTDL_DLLIB]) 76 AC_REQUIRE([AC_LTDL_SYMBOL_USCORE]) 77 AC_REQUIRE([AC_LTDL_DLSYM_USCORE]) 78 AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS]) 79 AC_REQUIRE([AC_LTDL_FUNC_ARGZ]) 80 81 AC_CHECK_HEADERS([assert.h ctype.h errno.h malloc.h memory.h stdlib.h \ 82 stdio.h unistd.h]) 83 AC_CHECK_HEADERS([dl.h sys/dl.h dld.h mach-o/dyld.h]) 84 AC_CHECK_HEADERS([string.h strings.h], [break]) 85 86 AC_CHECK_FUNCS([strchr index], [break]) 87 AC_CHECK_FUNCS([strrchr rindex], [break]) 88 AC_CHECK_FUNCS([memcpy bcopy], [break]) 89 AC_CHECK_FUNCS([memmove strcmp]) 90 AC_CHECK_FUNCS([closedir opendir readdir]) 91 ])# AC_LIB_LTDL 92 93 94 # AC_LTDL_ENABLE_INSTALL 95 # ---------------------- 96 AC_DEFUN([AC_LTDL_ENABLE_INSTALL], 97 [AC_ARG_ENABLE([ltdl-install], 98 [AS_HELP_STRING([--enable-ltdl-install],[install libltdl])]) 99 100 AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno) 101 AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno) 102 ])# AC_LTDL_ENABLE_INSTALL 103 104 105 # AC_LTDL_SYS_DLOPEN_DEPLIBS 106 # -------------------------- 107 AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS], 108 [AC_REQUIRE([AC_CANONICAL_HOST]) 109 AC_CACHE_CHECK([whether deplibs are loaded by dlopen], 110 [libltdl_cv_sys_dlopen_deplibs], 111 [# PORTME does your system automatically load deplibs for dlopen? 112 # or its logical equivalent (e.g. shl_load for HP-UX < 11) 113 # For now, we just catch OSes we know something about -- in the 114 # future, we'll try test this programmatically. 115 libltdl_cv_sys_dlopen_deplibs=unknown 116 case "$host_os" in 117 aix3*|aix4.1.*|aix4.2.*) 118 # Unknown whether this is true for these versions of AIX, but 119 # we want this `case' here to explicitly catch those versions. 120 libltdl_cv_sys_dlopen_deplibs=unknown 121 ;; 122 aix[[45]]*) 123 libltdl_cv_sys_dlopen_deplibs=yes 124 ;; 125 darwin*) 126 # Assuming the user has installed a libdl from somewhere, this is true 127 # If you are looking for one http://www.opendarwin.org/projects/dlcompat 128 libltdl_cv_sys_dlopen_deplibs=yes 129 ;; 130 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu) 131 # GNU and its variants, using gnu ld.so (Glibc) 132 libltdl_cv_sys_dlopen_deplibs=yes 133 ;; 134 hpux10*|hpux11*) 135 libltdl_cv_sys_dlopen_deplibs=yes 136 ;; 137 interix*) 138 libltdl_cv_sys_dlopen_deplibs=yes 139 ;; 140 irix[[12345]]*|irix6.[[01]]*) 141 # Catch all versions of IRIX before 6.2, and indicate that we don't 142 # know how it worked for any of those versions. 143 libltdl_cv_sys_dlopen_deplibs=unknown 144 ;; 145 irix*) 146 # The case above catches anything before 6.2, and it's known that 147 # at 6.2 and later dlopen does load deplibs. 148 libltdl_cv_sys_dlopen_deplibs=yes 149 ;; 150 netbsd*) 151 libltdl_cv_sys_dlopen_deplibs=yes 152 ;; 153 openbsd*) 154 libltdl_cv_sys_dlopen_deplibs=yes 155 ;; 156 osf[[1234]]*) 157 # dlopen did load deplibs (at least at 4.x), but until the 5.x series, 158 # it did *not* use an RPATH in a shared library to find objects the 159 # library depends on, so we explicitly say `no'. 160 libltdl_cv_sys_dlopen_deplibs=no 161 ;; 162 osf5.0|osf5.0a|osf5.1) 163 # dlopen *does* load deplibs and with the right loader patch applied 164 # it even uses RPATH in a shared library to search for shared objects 165 # that the library depends on, but there's no easy way to know if that 166 # patch is installed. Since this is the case, all we can really 167 # say is unknown -- it depends on the patch being installed. If 168 # it is, this changes to `yes'. Without it, it would be `no'. 169 libltdl_cv_sys_dlopen_deplibs=unknown 170 ;; 171 osf*) 172 # the two cases above should catch all versions of osf <= 5.1. Read 173 # the comments above for what we know about them. 174 # At > 5.1, deplibs are loaded *and* any RPATH in a shared library 175 # is used to find them so we can finally say `yes'. 176 libltdl_cv_sys_dlopen_deplibs=yes 177 ;; 178 solaris*) 179 libltdl_cv_sys_dlopen_deplibs=yes 180 ;; 181 sysv5* | sco3.2v5* | sco5v6* | unixware* | OpenUNIX* | sysv4*uw2*) 182 libltdl_cv_sys_dlopen_deplibs=yes 183 ;; 184 esac 185 ]) 186 if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then 187 AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1], 188 [Define if the OS needs help to load dependent libraries for dlopen().]) 189 fi 190 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS 191 192 193 # AC_LTDL_SHLIBEXT 194 # ---------------- 195 AC_DEFUN([AC_LTDL_SHLIBEXT], 196 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER]) 197 AC_CACHE_CHECK([which extension is used for loadable modules], 198 [libltdl_cv_shlibext], 199 [ 200 module=yes 201 eval libltdl_cv_shlibext=$shrext_cmds 202 ]) 203 if test -n "$libltdl_cv_shlibext"; then 204 AC_DEFINE_UNQUOTED([LTDL_SHLIB_EXT], ["$libltdl_cv_shlibext"], 205 [Define to the extension used for shared libraries, say, ".so".]) 206 fi 207 ])# AC_LTDL_SHLIBEXT 208 209 210 # AC_LTDL_SHLIBPATH 211 # ----------------- 212 AC_DEFUN([AC_LTDL_SHLIBPATH], 213 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER]) 214 AC_CACHE_CHECK([which variable specifies run-time library path], 215 [libltdl_cv_shlibpath_var], [libltdl_cv_shlibpath_var="$shlibpath_var"]) 216 if test -n "$libltdl_cv_shlibpath_var"; then 217 AC_DEFINE_UNQUOTED([LTDL_SHLIBPATH_VAR], ["$libltdl_cv_shlibpath_var"], 218 [Define to the name of the environment variable that determines the dynamic library search path.]) 219 fi 220 ])# AC_LTDL_SHLIBPATH 221 222 223 # AC_LTDL_SYSSEARCHPATH 224 # --------------------- 225 AC_DEFUN([AC_LTDL_SYSSEARCHPATH], 226 [AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER]) 227 AC_CACHE_CHECK([for the default library search path], 228 [libltdl_cv_sys_search_path], 229 [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"]) 230 if test -n "$libltdl_cv_sys_search_path"; then 231 sys_search_path= 232 for dir in $libltdl_cv_sys_search_path; do 233 if test -z "$sys_search_path"; then 234 sys_search_path="$dir" 235 else 236 sys_search_path="$sys_search_path$PATH_SEPARATOR$dir" 237 fi 238 done 239 AC_DEFINE_UNQUOTED([LTDL_SYSSEARCHPATH], ["$sys_search_path"], 240 [Define to the system default library search path.]) 241 fi 242 ])# AC_LTDL_SYSSEARCHPATH 243 244 245 # AC_LTDL_OBJDIR 246 # -------------- 247 AC_DEFUN([AC_LTDL_OBJDIR], 248 [AC_CACHE_CHECK([for objdir], 249 [libltdl_cv_objdir], 250 [libltdl_cv_objdir="$objdir" 251 if test -n "$objdir"; then 252 : 253 else 254 rm -f .libs 2>/dev/null 255 mkdir .libs 2>/dev/null 256 if test -d .libs; then 257 libltdl_cv_objdir=.libs 258 else 259 # MS-DOS does not allow filenames that begin with a dot. 260 libltdl_cv_objdir=_libs 261 fi 262 rmdir .libs 2>/dev/null 263 fi 264 ]) 265 AC_DEFINE_UNQUOTED([LTDL_OBJDIR], ["$libltdl_cv_objdir/"], 266 [Define to the sub-directory in which libtool stores uninstalled libraries.]) 267 ])# AC_LTDL_OBJDIR 268 269 270 # AC_LTDL_DLPREOPEN 271 # ----------------- 272 AC_DEFUN([AC_LTDL_DLPREOPEN], 273 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE]) 274 AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen], 275 [libltdl_cv_preloaded_symbols], 276 [if test -n "$lt_cv_sys_global_symbol_pipe"; then 277 libltdl_cv_preloaded_symbols=yes 278 else 279 libltdl_cv_preloaded_symbols=no 280 fi 281 ]) 282 if test x"$libltdl_cv_preloaded_symbols" = xyes; then 283 AC_DEFINE([HAVE_PRELOADED_SYMBOLS], [1], 284 [Define if libtool can extract symbol lists from object files.]) 285 fi 286 ])# AC_LTDL_DLPREOPEN 287 288 289 # AC_LTDL_DLLIB 290 # ------------- 291 AC_DEFUN([AC_LTDL_DLLIB], 292 [LIBADD_DL= 293 AC_SUBST(LIBADD_DL) 294 AC_LANG_PUSH([C]) 295 296 AC_CHECK_FUNC([shl_load], 297 [AC_DEFINE([HAVE_SHL_LOAD], [1], 298 [Define if you have the shl_load function.])], 299 [AC_CHECK_LIB([dld], [shl_load], 300 [AC_DEFINE([HAVE_SHL_LOAD], [1], 301 [Define if you have the shl_load function.]) 302 LIBADD_DL="$LIBADD_DL -ldld"], 303 [AC_CHECK_LIB([dl], [dlopen], 304 [AC_DEFINE([HAVE_LIBDL], [1], 305 [Define if you have the libdl library or equivalent.]) 306 LIBADD_DL="-ldl" libltdl_cv_lib_dl_dlopen="yes"], 307 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#if HAVE_DLFCN_H 308 # include <dlfcn.h> 309 #endif 310 ]], [[dlopen(0, 0);]])],[AC_DEFINE([HAVE_LIBDL], [1], 311 [Define if you have the libdl library or equivalent.]) libltdl_cv_func_dlopen="yes"],[AC_CHECK_LIB([svld], [dlopen], 312 [AC_DEFINE([HAVE_LIBDL], [1], 313 [Define if you have the libdl library or equivalent.]) 314 LIBADD_DL="-lsvld" libltdl_cv_func_dlopen="yes"], 315 [AC_CHECK_LIB([dld], [dld_link], 316 [AC_DEFINE([HAVE_DLD], [1], 317 [Define if you have the GNU dld library.]) 318 LIBADD_DL="$LIBADD_DL -ldld"], 319 [AC_CHECK_FUNC([_dyld_func_lookup], 320 [AC_DEFINE([HAVE_DYLD], [1], 321 [Define if you have the _dyld_func_lookup function.])]) 322 ]) 323 ]) 324 ]) 325 ]) 326 ]) 327 ]) 328 329 if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes 330 then 331 lt_save_LIBS="$LIBS" 332 LIBS="$LIBS $LIBADD_DL" 333 AC_CHECK_FUNCS([dlerror]) 334 LIBS="$lt_save_LIBS" 335 fi 336 AC_LANG_POP 337 ])# AC_LTDL_DLLIB 338 339 340 # AC_LTDL_SYMBOL_USCORE 341 # --------------------- 342 # does the compiler prefix global symbols with an underscore? 343 AC_DEFUN([AC_LTDL_SYMBOL_USCORE], 344 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE]) 345 AC_CACHE_CHECK([for _ prefix in compiled symbols], 346 [ac_cv_sys_symbol_underscore], 347 [ac_cv_sys_symbol_underscore=no 348 cat > conftest.$ac_ext <<EOF 349 void nm_test_func(){} 350 int main(){nm_test_func;return 0;} 351 EOF 352 if AC_TRY_EVAL(ac_compile); then 353 # Now try to grab the symbols. 354 ac_nlist=conftest.nm 355 if AC_TRY_EVAL(NM conftest.$ac_objext \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then 356 # See whether the symbols have a leading underscore. 357 if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then 358 ac_cv_sys_symbol_underscore=yes 359 else 360 if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then 361 : 362 else 363 echo "configure: cannot find nm_test_func in $ac_nlist" >&AS_MESSAGE_LOG_FD 364 fi 365 fi 366 else 367 echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AS_MESSAGE_LOG_FD 368 fi 369 else 370 echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD 371 cat conftest.c >&AS_MESSAGE_LOG_FD 372 fi 373 rm -rf conftest* 374 ]) 375 ])# AC_LTDL_SYMBOL_USCORE 376 377 378 # AC_LTDL_DLSYM_USCORE 379 # -------------------- 380 AC_DEFUN([AC_LTDL_DLSYM_USCORE], 381 [AC_REQUIRE([AC_LTDL_SYMBOL_USCORE]) 382 if test x"$ac_cv_sys_symbol_underscore" = xyes; then 383 if test x"$libltdl_cv_func_dlopen" = xyes || 384 test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then 385 AC_CACHE_CHECK([whether we have to add an underscore for dlsym], 386 [libltdl_cv_need_uscore], 387 [libltdl_cv_need_uscore=unknown 388 save_LIBS="$LIBS" 389 LIBS="$LIBS $LIBADD_DL" 390 _LT_AC_TRY_DLOPEN_SELF( 391 [libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes], 392 [], [libltdl_cv_need_uscore=cross]) 393 LIBS="$save_LIBS" 394 ]) 395 fi 396 fi 397 398 if test x"$libltdl_cv_need_uscore" = xyes; then 399 AC_DEFINE([NEED_USCORE], [1], 400 [Define if dlsym() requires a leading underscore in symbol names.]) 401 fi 402 ])# AC_LTDL_DLSYM_USCORE 403 404 # AC_LTDL_FUNC_ARGZ 405 # ----------------- 406 AC_DEFUN([AC_LTDL_FUNC_ARGZ], 407 [AC_CHECK_HEADERS([argz.h]) 408 409 AC_CHECK_TYPES([error_t], 410 [], 411 [AC_DEFINE([error_t], [int], 412 [Define to a type to use for `error_t' if it is not otherwise available.])], 413 [#if HAVE_ARGZ_H 414 # include <argz.h> 415 #endif]) 416 417 AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify]) 418 ])# AC_LTDL_FUNC_ARGZ 419
