llvm-6502/projects/sample/autoconf/m4/ltdl.m4
Daniel Dunbar 2532fa21a9 projects/sample: Import adapted form of current LLVM autoconf/Makefile setup so that projects/sample is standalone and not tied to the LLVM build setup.
- This currently just moves over all of the behavior from LLVM. Eventually all of the configure checks that are directly needed by the LLVM build setup should probably go away, and the project should manage their own configuration checks if necessary.

 - This is the 1st half of this work, the actual Makefile.common hasn't moved over yet. I've tried to stage this in such a way that incremental builds will properly reconfigure for most active developers (the Makefiles don't handle reconfiguring in a perfectly reliable way, and I haven't found an easy way to make them do so).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142456 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-18 23:10:47 +00:00

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## ltdl.m4 - Configure ltdl for the target system. -*-Autoconf-*-
## Copyright (C) 1999-2000 Free Software Foundation, Inc.
##
## This file is free software; the Free Software Foundation gives
## unlimited permission to copy and/or distribute it, with or without
## modifications, as long as this notice is preserved.
# serial 7 AC_LIB_LTDL
# AC_WITH_LTDL
# ------------
# Clients of libltdl can use this macro to allow the installer to
# choose between a shipped copy of the ltdl sources or a preinstalled
# version of the library.
AC_DEFUN([AC_WITH_LTDL],
[AC_REQUIRE([AC_LIB_LTDL])
AC_SUBST([LIBLTDL])
AC_SUBST([INCLTDL])
# Unless the user asks us to check, assume no installed ltdl exists.
use_installed_libltdl=no
AC_ARG_WITH([included_ltdl],
[ --with-included-ltdl use the GNU ltdl sources included here])
if test "x$with_included_ltdl" != xyes; then
# We are not being forced to use the included libltdl sources, so
# decide whether there is a useful installed version we can use.
AC_CHECK_HEADER([ltdl.h],
[AC_CHECK_LIB([ltdl], [lt_dlcaller_register],
[with_included_ltdl=no],
[with_included_ltdl=yes])
])
fi
if test "x$enable_ltdl_install" != xyes; then
# If the user did not specify an installable libltdl, then default
# to a convenience lib.
AC_LIBLTDL_CONVENIENCE
fi
if test "x$with_included_ltdl" = xno; then
# If the included ltdl is not to be used. then Use the
# preinstalled libltdl we found.
AC_DEFINE([HAVE_LTDL], [1],
[Define this if a modern libltdl is already installed])
LIBLTDL=-lltdl
fi
# Report our decision...
AC_MSG_CHECKING([whether to use included libltdl])
AC_MSG_RESULT([$with_included_ltdl])
AC_CONFIG_SUBDIRS([libltdl])
])# AC_WITH_LTDL
# AC_LIB_LTDL
# -----------
# Perform all the checks necessary for compilation of the ltdl objects
# -- including compiler checks and header checks.
AC_DEFUN([AC_LIB_LTDL],
[AC_PREREQ(2.60)
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_C_CONST])
AC_REQUIRE([AC_HEADER_STDC])
AC_REQUIRE([AC_HEADER_DIRENT])
AC_REQUIRE([_LT_AC_CHECK_DLFCN])
AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])
AC_REQUIRE([AC_LTDL_SHLIBEXT])
AC_REQUIRE([AC_LTDL_SHLIBPATH])
AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])
AC_REQUIRE([AC_LTDL_OBJDIR])
AC_REQUIRE([AC_LTDL_DLPREOPEN])
AC_REQUIRE([AC_LTDL_DLLIB])
AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
AC_REQUIRE([AC_LTDL_DLSYM_USCORE])
AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])
AC_REQUIRE([AC_LTDL_FUNC_ARGZ])
AC_CHECK_HEADERS([assert.h ctype.h errno.h malloc.h memory.h stdlib.h \
stdio.h unistd.h])
AC_CHECK_HEADERS([dl.h sys/dl.h dld.h mach-o/dyld.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([memmove strcmp])
AC_CHECK_FUNCS([closedir opendir readdir])
])# AC_LIB_LTDL
# AC_LTDL_ENABLE_INSTALL
# ----------------------
AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
[AC_ARG_ENABLE([ltdl-install],
[AS_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_LTDL_ENABLE_INSTALL
# 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],
[# PORTME does your system automatically load deplibs for dlopen?
# or its logical equivalent (e.g. shl_load for HP-UX < 11)
# For now, we just catch OSes we know something about -- in the
# future, we'll try test this programmatically.
libltdl_cv_sys_dlopen_deplibs=unknown
case "$host_os" in
aix3*|aix4.1.*|aix4.2.*)
# Unknown whether this is true for these versions of AIX, but
# we want this `case' here to explicitly catch those versions.
libltdl_cv_sys_dlopen_deplibs=unknown
;;
aix[[45]]*)
libltdl_cv_sys_dlopen_deplibs=yes
;;
darwin*)
# Assuming the user has installed a libdl from somewhere, this is true
# If you are looking for one http://www.opendarwin.org/projects/dlcompat
libltdl_cv_sys_dlopen_deplibs=yes
;;
gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
# GNU and its variants, using gnu ld.so (Glibc)
libltdl_cv_sys_dlopen_deplibs=yes
;;
hpux10*|hpux11*)
libltdl_cv_sys_dlopen_deplibs=yes
;;
interix*)
libltdl_cv_sys_dlopen_deplibs=yes
;;
irix[[12345]]*|irix6.[[01]]*)
# Catch all versions of IRIX before 6.2, and indicate that we don't
# know how it worked for any of those versions.
libltdl_cv_sys_dlopen_deplibs=unknown
;;
irix*)
# The case above catches anything before 6.2, and it's known that
# at 6.2 and later dlopen does load deplibs.
libltdl_cv_sys_dlopen_deplibs=yes
;;
netbsd*)
libltdl_cv_sys_dlopen_deplibs=yes
;;
openbsd*)
libltdl_cv_sys_dlopen_deplibs=yes
;;
osf[[1234]]*)
# dlopen did load deplibs (at least at 4.x), but until the 5.x series,
# it did *not* use an RPATH in a shared library to find objects the
# library depends on, so we explicitly say `no'.
libltdl_cv_sys_dlopen_deplibs=no
;;
osf5.0|osf5.0a|osf5.1)
# dlopen *does* load deplibs and with the right loader patch applied
# it even uses RPATH in a shared library to search for shared objects
# that the library depends on, but there's no easy way to know if that
# patch is installed. Since this is the case, all we can really
# say is unknown -- it depends on the patch being installed. If
# it is, this changes to `yes'. Without it, it would be `no'.
libltdl_cv_sys_dlopen_deplibs=unknown
;;
osf*)
# the two cases above should catch all versions of osf <= 5.1. Read
# the comments above for what we know about them.
# At > 5.1, deplibs are loaded *and* any RPATH in a shared library
# is used to find them so we can finally say `yes'.
libltdl_cv_sys_dlopen_deplibs=yes
;;
solaris*)
libltdl_cv_sys_dlopen_deplibs=yes
;;
sysv5* | sco3.2v5* | sco5v6* | unixware* | OpenUNIX* | sysv4*uw2*)
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_LTDL_SHLIBEXT
# ----------------
AC_DEFUN([AC_LTDL_SHLIBEXT],
[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
AC_CACHE_CHECK([which extension is used for loadable modules],
[libltdl_cv_shlibext],
[
module=yes
eval libltdl_cv_shlibext=$shrext_cmds
])
if test -n "$libltdl_cv_shlibext"; then
AC_DEFINE_UNQUOTED([LTDL_SHLIB_EXT], ["$libltdl_cv_shlibext"],
[Define to the extension used for shared libraries, say, ".so".])
fi
])# AC_LTDL_SHLIBEXT
# AC_LTDL_SHLIBPATH
# -----------------
AC_DEFUN([AC_LTDL_SHLIBPATH],
[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
AC_CACHE_CHECK([which variable specifies run-time library path],
[libltdl_cv_shlibpath_var], [libltdl_cv_shlibpath_var="$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_LTDL_SHLIBPATH
# AC_LTDL_SYSSEARCHPATH
# ---------------------
AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
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
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$PATH_SEPARATOR$dir"
fi
done
AC_DEFINE_UNQUOTED([LTDL_SYSSEARCHPATH], ["$sys_search_path"],
[Define to the system default library search path.])
fi
])# AC_LTDL_SYSSEARCHPATH
# AC_LTDL_OBJDIR
# --------------
AC_DEFUN([AC_LTDL_OBJDIR],
[AC_CACHE_CHECK([for objdir],
[libltdl_cv_objdir],
[libltdl_cv_objdir="$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_LTDL_OBJDIR
# AC_LTDL_DLPREOPEN
# -----------------
AC_DEFUN([AC_LTDL_DLPREOPEN],
[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
[libltdl_cv_preloaded_symbols],
[if test -n "$lt_cv_sys_global_symbol_pipe"; then
libltdl_cv_preloaded_symbols=yes
else
libltdl_cv_preloaded_symbols=no
fi
])
if test x"$libltdl_cv_preloaded_symbols" = xyes; then
AC_DEFINE([HAVE_PRELOADED_SYMBOLS], [1],
[Define if libtool can extract symbol lists from object files.])
fi
])# AC_LTDL_DLPREOPEN
# AC_LTDL_DLLIB
# -------------
AC_DEFUN([AC_LTDL_DLLIB],
[LIBADD_DL=
AC_SUBST(LIBADD_DL)
AC_LANG_PUSH([C])
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="$LIBADD_DL -ldld"],
[AC_CHECK_LIB([dl], [dlopen],
[AC_DEFINE([HAVE_LIBDL], [1],
[Define if you have the libdl library or equivalent.])
LIBADD_DL="-ldl" libltdl_cv_lib_dl_dlopen="yes"],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[#if HAVE_DLFCN_H
# include <dlfcn.h>
#endif
]], [[dlopen(0, 0);]])],[AC_DEFINE([HAVE_LIBDL], [1],
[Define if you have the libdl library or equivalent.]) libltdl_cv_func_dlopen="yes"],[AC_CHECK_LIB([svld], [dlopen],
[AC_DEFINE([HAVE_LIBDL], [1],
[Define if you have the libdl library or equivalent.])
LIBADD_DL="-lsvld" libltdl_cv_func_dlopen="yes"],
[AC_CHECK_LIB([dld], [dld_link],
[AC_DEFINE([HAVE_DLD], [1],
[Define if you have the GNU dld library.])
LIBADD_DL="$LIBADD_DL -ldld"],
[AC_CHECK_FUNC([_dyld_func_lookup],
[AC_DEFINE([HAVE_DYLD], [1],
[Define if you have the _dyld_func_lookup function.])])
])
])
])
])
])
])
if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes
then
lt_save_LIBS="$LIBS"
LIBS="$LIBS $LIBADD_DL"
AC_CHECK_FUNCS([dlerror])
LIBS="$lt_save_LIBS"
fi
AC_LANG_POP
])# AC_LTDL_DLLIB
# AC_LTDL_SYMBOL_USCORE
# ---------------------
# does the compiler prefix global symbols with an underscore?
AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
AC_CACHE_CHECK([for _ prefix in compiled symbols],
[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 \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
# See whether the symbols have a leading underscore.
if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
ac_cv_sys_symbol_underscore=yes
else
if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
:
else
echo "configure: cannot find nm_test_func in $ac_nlist" >&AS_MESSAGE_LOG_FD
fi
fi
else
echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AS_MESSAGE_LOG_FD
fi
else
echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
cat conftest.c >&AS_MESSAGE_LOG_FD
fi
rm -rf conftest*
])
])# AC_LTDL_SYMBOL_USCORE
# AC_LTDL_DLSYM_USCORE
# --------------------
AC_DEFUN([AC_LTDL_DLSYM_USCORE],
[AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
if test x"$ac_cv_sys_symbol_underscore" = xyes; then
if test x"$libltdl_cv_func_dlopen" = xyes ||
test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
[libltdl_cv_need_uscore],
[libltdl_cv_need_uscore=unknown
save_LIBS="$LIBS"
LIBS="$LIBS $LIBADD_DL"
_LT_AC_TRY_DLOPEN_SELF(
[libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
[], [libltdl_cv_need_uscore=cross])
LIBS="$save_LIBS"
])
fi
fi
if test x"$libltdl_cv_need_uscore" = xyes; then
AC_DEFINE([NEED_USCORE], [1],
[Define if dlsym() requires a leading underscore in symbol names.])
fi
])# AC_LTDL_DLSYM_USCORE
# AC_LTDL_FUNC_ARGZ
# -----------------
AC_DEFUN([AC_LTDL_FUNC_ARGZ],
[AC_CHECK_HEADERS([argz.h])
AC_CHECK_TYPES([error_t],
[],
[AC_DEFINE([error_t], [int],
[Define to a type to use for `error_t' if it is not otherwise available.])],
[#if HAVE_ARGZ_H
# include <argz.h>
#endif])
AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify])
])# AC_LTDL_FUNC_ARGZ