## ltdl.m4 - Configure ltdl for the target system. -*-Shell-script-*- ## 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 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 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(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_DEFUN(AC_LTDL_ENABLE_INSTALL, [AC_ARG_ENABLE(ltdl-install, [ --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_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= for spec in $library_names_spec; do last="$spec" done 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 "$libltdl_cv_sys_search_path"; then case "$lt_target" 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_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 < $ac_nlist) && test -s "$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 "$ac_nlist"T fi # Make sure that we snagged all the symbols we need. if egrep ' nm_test_var$' "$ac_nlist" >/dev/null; then if egrep ' nm_test_func$' "$ac_nlist" >/dev/null; then cat < conftest.c #ifdef __cplusplus extern "C" { #endif EOF # Now generate the symbol file. eval "$ac_global_symbol_to_cdecl"' < "$ac_nlist" >> conftest.c' cat <> conftest.c #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.c cat <<\EOF >> conftest.c {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$no_builtin_flag" if AC_TRY_EVAL(ac_link) && test -s conftest; then ac_pipe_works=yes else echo "configure: failed program was:" >&AC_FD_CC cat conftest.c >&AC_FD_CC fi LIBS="$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.c >&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 < $ac_nlist) && test -s "$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 $ac_cv_sys_global_symbol_pipe" >&AC_FD_CC fi else echo "configure: failed program was:" >&AC_FD_CC cat conftest.c >&AC_FD_CC fi rm -rf conftest* ]) AC_MSG_RESULT($ac_cv_sys_symbol_underscore) AC_LTDL_DLSYM_USCORE ]) 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"$ac_cv_lib_dl_dlopen" = xyes ; then AC_CACHE_CHECK([whether we have to add an underscore for dlsym], libltdl_cv_need_uscore, [dnl AC_TRY_RUN([ #if HAVE_DLFCN_H #include #endif #include #ifdef RTLD_GLOBAL # define LTDL_GLOBAL RTLD_GLOBAL #else # ifdef DL_GLOBAL # define LTDL_GLOBAL DL_GLOBAL # else # define LTDL_GLOBAL 0 # endif #endif /* We may have to define LTDL_LAZY_OR_NOW in the command line if we find out it does not work in some platform. */ #ifndef LTDL_LAZY_OR_NOW # ifdef RTLD_LAZY # define LTDL_LAZY_OR_NOW RTLD_LAZY # else # ifdef DL_LAZY # define LTDL_LAZY_OR_NOW DL_LAZY # else # ifdef RTLD_NOW # define LTDL_LAZY_OR_NOW RTLD_NOW # else # ifdef DL_NOW # define LTDL_LAZY_OR_NOW DL_NOW # else # define LTDL_LAZY_OR_NOW 0 # endif # endif # endif # endif #endif fnord() { int i=42;} main() { void *self, *ptr1, *ptr2; self=dlopen(0,LTDL_GLOBAL|LTDL_LAZY_OR_NOW); if(self) { ptr1=dlsym(self,"fnord"); ptr2=dlsym(self,"_fnord"); if(ptr1 && !ptr2) { dlclose(self); exit(0); } } exit(1); } ], libltdl_cv_need_uscore=no, libltdl_cv_need_uscore=yes, libltdl_cv_need_uscore=cross )]) fi fi if test x"$libltdl_cv_need_uscore" = xyes; then AC_DEFINE(NEED_USCORE, 1, [Define if dlsym() requires a leading underscode in symbol names. ]) fi ])