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. 15AC_DEFUN([AC_WITH_LTDL], 16[AC_REQUIRE([AC_LIB_LTDL]) 17AC_SUBST([LIBLTDL]) 18AC_SUBST([INCLTDL]) 19 20# Unless the user asks us to check, assume no installed ltdl exists. 21use_installed_libltdl=no 22 23AC_ARG_WITH([included_ltdl], 24 [ --with-included-ltdl use the GNU ltdl sources included here]) 25 26if test "x$with_included_ltdl" != xyes; then 27 # We are not being forced to use the included libltdl sources, so 28 # decide whether there is a useful installed version we can use. 29 AC_CHECK_HEADER([ltdl.h], 30 [AC_CHECK_LIB([ltdl], [lt_dlcaller_register], 31 [with_included_ltdl=no], 32 [with_included_ltdl=yes]) 33 ]) 34fi 35 36if test "x$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 40fi 41 42if test "x$with_included_ltdl" = xno; then 43 # If the included ltdl is not to be used. then Use the 44 # preinstalled libltdl we found. 45 AC_DEFINE([HAVE_LTDL], [1], 46 [Define this if a modern libltdl is already installed]) 47 LIBLTDL=-lltdl 48fi 49 50# Report our decision... 51AC_MSG_CHECKING([whether to use included libltdl]) 52AC_MSG_RESULT([$with_included_ltdl]) 53 54AC_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. 62AC_DEFUN([AC_LIB_LTDL], 63[AC_PREREQ(2.60) 64AC_REQUIRE([AC_PROG_CC]) 65AC_REQUIRE([AC_C_CONST]) 66AC_REQUIRE([AC_HEADER_STDC]) 67AC_REQUIRE([AC_HEADER_DIRENT]) 68AC_REQUIRE([_LT_AC_CHECK_DLFCN]) 69AC_REQUIRE([AC_LTDL_ENABLE_INSTALL]) 70AC_REQUIRE([AC_LTDL_SHLIBEXT]) 71AC_REQUIRE([AC_LTDL_SYSSEARCHPATH]) 72AC_REQUIRE([AC_LTDL_OBJDIR]) 73AC_REQUIRE([AC_LTDL_DLPREOPEN]) 74AC_REQUIRE([AC_LTDL_DLLIB]) 75AC_REQUIRE([AC_LTDL_SYMBOL_USCORE]) 76AC_REQUIRE([AC_LTDL_DLSYM_USCORE]) 77AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS]) 78AC_REQUIRE([AC_LTDL_FUNC_ARGZ]) 79 80AC_CHECK_HEADERS([assert.h ctype.h errno.h malloc.h memory.h stdlib.h \ 81 stdio.h unistd.h]) 82AC_CHECK_HEADERS([dl.h sys/dl.h dld.h mach-o/dyld.h]) 83AC_CHECK_HEADERS([string.h strings.h], [break]) 84 85AC_CHECK_FUNCS([strchr index], [break]) 86AC_CHECK_FUNCS([strrchr rindex], [break]) 87AC_CHECK_FUNCS([memcpy bcopy], [break]) 88AC_CHECK_FUNCS([memmove strcmp]) 89AC_CHECK_FUNCS([closedir opendir readdir]) 90])# AC_LIB_LTDL 91 92 93# AC_LTDL_ENABLE_INSTALL 94# ---------------------- 95AC_DEFUN([AC_LTDL_ENABLE_INSTALL], 96[AC_ARG_ENABLE([ltdl-install], 97 [AS_HELP_STRING([--enable-ltdl-install],[install libltdl])]) 98 99AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno) 100AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno) 101])# AC_LTDL_ENABLE_INSTALL 102 103 104# AC_LTDL_SYS_DLOPEN_DEPLIBS 105# -------------------------- 106AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS], 107[AC_REQUIRE([AC_CANONICAL_HOST]) 108AC_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 115 case "$host_os" in 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 120 ;; 121 aix[[45]]*) 122 libltdl_cv_sys_dlopen_deplibs=yes 123 ;; 124 darwin*) 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 128 ;; 129 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu) 130 # GNU and its variants, using gnu ld.so (Glibc) 131 libltdl_cv_sys_dlopen_deplibs=yes 132 ;; 133 hpux10*|hpux11*) 134 libltdl_cv_sys_dlopen_deplibs=yes 135 ;; 136 interix*) 137 libltdl_cv_sys_dlopen_deplibs=yes 138 ;; 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 143 ;; 144 irix*) 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 148 ;; 149 netbsd*) 150 libltdl_cv_sys_dlopen_deplibs=yes 151 ;; 152 openbsd*) 153 libltdl_cv_sys_dlopen_deplibs=yes 154 ;; 155 osf[[1234]]*) 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 160 ;; 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 169 ;; 170 osf*) 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 176 ;; 177 solaris*) 178 libltdl_cv_sys_dlopen_deplibs=yes 179 ;; 180 sysv5* | sco3.2v5* | sco5v6* | unixware* | OpenUNIX* | sysv4*uw2*) 181 libltdl_cv_sys_dlopen_deplibs=yes 182 ;; 183 esac 184 ]) 185if 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().]) 188fi 189])# AC_LTDL_SYS_DLOPEN_DEPLIBS 190 191 192# AC_LTDL_SHLIBEXT 193# ---------------- 194AC_DEFUN([AC_LTDL_SHLIBEXT], 195[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER]) 196AC_CACHE_CHECK([which extension is used for loadable modules], 197 [libltdl_cv_shlibext], 198[ 199module=yes 200eval libltdl_cv_shlibext=$shrext_cmds 201 ]) 202if test -n "$libltdl_cv_shlibext"; then 203 AC_DEFINE_UNQUOTED([LTDL_SHLIB_EXT], ["$libltdl_cv_shlibext"], 204 [Define to the extension used for shared libraries, say, ".so".]) 205fi 206])# AC_LTDL_SHLIBEXT 207 208# AC_LTDL_SYSSEARCHPATH 209# --------------------- 210AC_DEFUN([AC_LTDL_SYSSEARCHPATH], 211[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER]) 212AC_CACHE_CHECK([for the default library search path], 213 [libltdl_cv_sys_search_path], 214 [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"]) 215if test -n "$libltdl_cv_sys_search_path"; then 216 sys_search_path= 217 for dir in $libltdl_cv_sys_search_path; do 218 if test -z "$sys_search_path"; then 219 sys_search_path="$dir" 220 else 221 sys_search_path="$sys_search_path$PATH_SEPARATOR$dir" 222 fi 223 done 224 AC_DEFINE_UNQUOTED([LTDL_SYSSEARCHPATH], ["$sys_search_path"], 225 [Define to the system default library search path.]) 226fi 227])# AC_LTDL_SYSSEARCHPATH 228 229 230# AC_LTDL_OBJDIR 231# -------------- 232AC_DEFUN([AC_LTDL_OBJDIR], 233[AC_CACHE_CHECK([for objdir], 234 [libltdl_cv_objdir], 235 [libltdl_cv_objdir="$objdir" 236 if test -n "$objdir"; then 237 : 238 else 239 rm -f .libs 2>/dev/null 240 mkdir .libs 2>/dev/null 241 if test -d .libs; then 242 libltdl_cv_objdir=.libs 243 else 244 # MS-DOS does not allow filenames that begin with a dot. 245 libltdl_cv_objdir=_libs 246 fi 247 rmdir .libs 2>/dev/null 248 fi 249 ]) 250AC_DEFINE_UNQUOTED([LTDL_OBJDIR], ["$libltdl_cv_objdir/"], 251 [Define to the sub-directory in which libtool stores uninstalled libraries.]) 252])# AC_LTDL_OBJDIR 253 254 255# AC_LTDL_DLPREOPEN 256# ----------------- 257AC_DEFUN([AC_LTDL_DLPREOPEN], 258[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE]) 259AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen], 260 [libltdl_cv_preloaded_symbols], 261 [if test -n "$lt_cv_sys_global_symbol_pipe"; then 262 libltdl_cv_preloaded_symbols=yes 263 else 264 libltdl_cv_preloaded_symbols=no 265 fi 266 ]) 267if test x"$libltdl_cv_preloaded_symbols" = xyes; then 268 AC_DEFINE([HAVE_PRELOADED_SYMBOLS], [1], 269 [Define if libtool can extract symbol lists from object files.]) 270fi 271])# AC_LTDL_DLPREOPEN 272 273 274# AC_LTDL_DLLIB 275# ------------- 276AC_DEFUN([AC_LTDL_DLLIB], 277[LIBADD_DL= 278AC_SUBST(LIBADD_DL) 279AC_LANG_PUSH([C]) 280 281AC_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="$LIBADD_DL -ldld"], 288 [AC_CHECK_LIB([dl], [dlopen], 289 [AC_DEFINE([HAVE_LIBDL], [1], 290 [Define if you have the libdl library or equivalent.]) 291 LIBADD_DL="-ldl" libltdl_cv_lib_dl_dlopen="yes"], 292 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#if HAVE_DLFCN_H 293# include <dlfcn.h> 294#endif 295 ]], [[dlopen(0, 0);]])],[AC_DEFINE([HAVE_LIBDL], [1], 296 [Define if you have the libdl library or equivalent.]) libltdl_cv_func_dlopen="yes"],[AC_CHECK_LIB([svld], [dlopen], 297 [AC_DEFINE([HAVE_LIBDL], [1], 298 [Define if you have the libdl library or equivalent.]) 299 LIBADD_DL="-lsvld" libltdl_cv_func_dlopen="yes"], 300 [AC_CHECK_LIB([dld], [dld_link], 301 [AC_DEFINE([HAVE_DLD], [1], 302 [Define if you have the GNU dld library.]) 303 LIBADD_DL="$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.])]) 307 ]) 308 ]) 309 ]) 310 ]) 311 ]) 312]) 313 314if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes 315then 316 lt_save_LIBS="$LIBS" 317 LIBS="$LIBS $LIBADD_DL" 318 AC_CHECK_FUNCS([dlerror]) 319 LIBS="$lt_save_LIBS" 320fi 321AC_LANG_POP 322])# AC_LTDL_DLLIB 323 324 325# AC_LTDL_SYMBOL_USCORE 326# --------------------- 327# does the compiler prefix global symbols with an underscore? 328AC_DEFUN([AC_LTDL_SYMBOL_USCORE], 329[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE]) 330AC_CACHE_CHECK([for _ prefix in compiled symbols], 331 [ac_cv_sys_symbol_underscore], 332 [ac_cv_sys_symbol_underscore=no 333 cat > conftest.$ac_ext <<EOF 334void nm_test_func(){} 335int main(){nm_test_func;return 0;} 336EOF 337 if AC_TRY_EVAL(ac_compile); then 338 # Now try to grab the symbols. 339 ac_nlist=conftest.nm 340 if AC_TRY_EVAL(NM conftest.$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' "$ac_nlist" >/dev/null; then 343 ac_cv_sys_symbol_underscore=yes 344 else 345 if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then 346 : 347 else 348 echo "configure: cannot find nm_test_func in $ac_nlist" >&AS_MESSAGE_LOG_FD 349 fi 350 fi 351 else 352 echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AS_MESSAGE_LOG_FD 353 fi 354 else 355 echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD 356 cat conftest.c >&AS_MESSAGE_LOG_FD 357 fi 358 rm -rf conftest* 359 ]) 360])# AC_LTDL_SYMBOL_USCORE 361 362 363# AC_LTDL_DLSYM_USCORE 364# -------------------- 365AC_DEFUN([AC_LTDL_DLSYM_USCORE], 366[AC_REQUIRE([AC_LTDL_SYMBOL_USCORE]) 367if test x"$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 373 save_LIBS="$LIBS" 374 LIBS="$LIBS $LIBADD_DL" 375 _LT_AC_TRY_DLOPEN_SELF( 376 [libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes], 377 [], [libltdl_cv_need_uscore=cross]) 378 LIBS="$save_LIBS" 379 ]) 380 fi 381fi 382 383if 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.]) 386fi 387])# AC_LTDL_DLSYM_USCORE 388 389# AC_LTDL_FUNC_ARGZ 390# ----------------- 391AC_DEFUN([AC_LTDL_FUNC_ARGZ], 392[AC_CHECK_HEADERS([argz.h]) 393 394AC_CHECK_TYPES([error_t], 395 [], 396 [AC_DEFINE([error_t], [int], 397 [Define to a type to use for `error_t' if it is not otherwise available.])], 398 [#if HAVE_ARGZ_H 399# include <argz.h> 400#endif]) 401 402AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify]) 403])# AC_LTDL_FUNC_ARGZ 404