Shared LT DL library sources
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libltdl/ltdl.m4

519 lines
14 KiB

## 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
])