dnl aclocal.m4 --- Dynamically linked library support for XEmacs
-dnl Copyright (C) 1998 Free Software Foundation, Inc.
-dnl Author: William Perry <wmperry@aventail.com>
-dnl This file is part of XEmacs
-
-AC_DEFUN(XE_MAKE_SHAREDLIB, [
-dll_ld="ld"
-dll_lflags="-shared"
-dll_cflags="-r"
-dll_oflags="-o "
-
-AC_MSG_CHECKING(how to build a shared library)
-case `uname -rs` in
- UNIX_SV*|UNIX_System_V*)
- dll_lflags="-G"
- dll_cflags=-Kpic
- dll_ld="ld"
- ;;
- BSD/OS*)
- dll_cflags=
- dll_lflags="-r"
- dll_ld="shlicc2"
- ;;
- FreeBSD*2*)
- dll_lflags="-Bshareable"
- dll_cflags="-fPIC -DPIC"
- dll_ld=ld
- ;;
- SunOS*4.*)
- dll_cflags="-P"
- dll_lflags="-dp -assert pure-text -assert nodefinitions"
- ;;
- SunOS*5.*)
- dll_ld="cc"
- dll_cflags="-KPIC"
- dll_lflags="-G"
- dll_oflags="-W0,-y-o -W0,-y"
- ;;
- IRIX*5.*|IRIX*6.*)
- dll_cflags="-KPIC"
- ;;
- OSF1*)
- ;;
- HP-UX*)
- dll_ld="ld"
- dll_lflags="-b"
- dll_cflags="+z"
- ;;
- SCO_SV*)
- dll_ld="ld"
- dll_lflags="-G"
- dll_cflags="-Kpic"
- ;;
- AIX*)
- dll_lflags="-H512 -T512 -bhalt:4 -bM:SRE -bE:\${@:.ell=.exp} -b noentry -lc"
- dll_ld="ld"
- ;;
- *)
- ;;
- esac
-
- if test "$GCC" = "yes" ; then
- dll_cflags="-fPIC"
- case `uname -rs` in
- SunOS*5.*)
- dll_ld="ld"
- dll_oflags="-o "
- dll_lflags="-G"
- ;;
- SCO_SV*)
- dll_ld="ld"
- dll_lflags="-G"
- dll_cflags="-b elf"
- ;;
- FreeBSD*)
- dll_cflags="-DDLSYM_NEEDS_UNDERSCORE -DPIC -fPIC"
- dll_lflags="-Bshareable"
- dll_ld=ld
- ;;
- BSD/OS*)
- dll_cflags=
- dll_lflags="-r"
- dll_ld="shlicc2"
- ;;
- UNIX_SV*)
- dll_cflags="-fPIC"
- ;;
- *)
- dll_ld="$CC"
- dll_lflags="-shared"
- esac
- fi
-
- AC_MSG_RESULT("lflags: $dll_lflags cflags: $dll_cflags")
+dnl Copyright (C) 1998, 1999 J. Kean Johnston.
+dnl Author: J. Kean Johnston <jkj@sco.com>, based on work in libtool.
+dnl This file is part of XEmacs.
+
+dnl
+dnl There are several things we care about here. First, we need to find
+dnl out how we create an executable that has its symbols exported, so
+dnl that dynamically loaded modules have access to the internal XEmacs
+dnl symbols. This is stored in ``ld_dynamic_link_flags'' and is used
+dnl in the main Makefile.
+dnl Next, we need to know how we compile actual shared libraries, and
+dnl the objects in them. For these purposes, we need to determine the
+dnl C compiler flags used to produce shared objects (``dll_cflags''),
+dnl what linker to use to create the final shared object that will be
+dnl loaded (``dll_ld'') and the flags to pass to that linker
+dnl (``dll_ldflags''). This information is used by ellcc to build up
+dnl the command line when compiling modules. We build up two other commands
+dnl for extremely weird systems where special things need to be done.
+dnl The first is ``dll_ldo'', which is the flag used to specify the output
+dnl file name, and the second is ``dll_post'' which is inserted after the
+dnl list of objects.
+dnl After all of this, we should be able to:
+dnl $(CC) $(CFLAGS) $(dll_cflags) -c module.c
+dnl to produce a single shared object
+dnl And then:
+dnl $(dll_ld) $(dll_ldflags) $(dll_ldo) module.ell module.o $(dll_post)
+dnl to create the loadable shared library.
+dnl
+dnl NOTE: In the code below, where I have modified things to work with
+dnl XEmacs, we use $canonical instead of libtool's $host, and we use
+dnl $internal_configuration instead of $host_alias. To make typing
+dnl shorter we assign these to $xehost and $xealias
+
+AC_DEFUN(XE_SHLIB_STUFF,[
+dll_ld=
+dll_ldflags=
+dll_cflags=
+dll_post=
+dll_ldo="-o"
+ld_dynamic_link_flags=
+xehost=$canonical
+xealias=$internal_configuration
+
+AC_CHECKING([how to build dynamic libraries for ${xehost}])
+# Transform *-*-linux* to *-*-linux-gnu*, to support old configure scripts.
+case "$xehost" in
+*-*-linux-gnu*) ;;
+*-*-linux*) xehost=`echo $xehost | sed 's/^\(.*-.*-linux\)\(.*\)$/\1-gnu\2/'`
+esac
+
+changequote(<<, >>)dnl
+xehost_cpu=`echo $xehost | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\1/'`
+xehost_vendor=`echo $xehost | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\2/'`
+xehost_os=`echo $xehost | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
+changequote([, ])dnl
+
+case "$xehost_os" in
+aix3*)
+ # AIX sometimes has problems with the GCC collect2 program. For some
+ # reason, if we set the COLLECT_NAMES environment variable, the problems
+ # vanish in a puff of smoke.
+ if test "${COLLECT_NAMES+set}" != set; then
+ COLLECT_NAMES=
+ export COLLECT_NAMES
+ fi
+ ;;
+esac
+
+# Now see if the compiler is really GCC.
+if test "$GCC" = "yes"; then
+ XEGCC=yes
+else
+ AC_MSG_CHECKING(checking whether we are using GNU C)
+ AC_EGREP_CPP(yes,[
+#ifdef __GNUC__
+ yes;
+#endif
+],XEGCC=yes, XEGCC=no)
+ AC_MSG_RESULT([${XEGCC}])
+fi
+
+AC_MSG_CHECKING(how to produce PIC code)
+wl=
+
+can_build_shared=yes
+if test "$XEGCC" = yes -o "$__ICC" = yes; then
+ wl='-Wl,'
+
+ case "$xehost_os" in
+ aix[[3-9]]* | irix[[5-9]]* | osf[[3-9]])
+ # PIC is the default for these OSes.
+ ;;
+
+ os2*)
+ # We can build DLLs from non-PIC.
+ ;;
+ amigaos*)
+ # FIXME: we need at least 68020 code to build shared libraries, but
+ # adding the `-m68020' flag to GCC prevents building anything better,
+ # like `-m68040'.
+ dll_cflags='-m68020 -resident32 -malways-restore-a4'
+ ;;
+ *cygwin* | *mingw* )
+ # PIC is the default
+ ;;
+ *)
+ dll_cflags='-fPIC'
+ ;;
+ esac
+else
+ # PORTME Check for PIC flags for the system compiler.
+ case "$xehost_os" in
+ hpux9* | hpux1[[0-9]]*)
+ # Is there a better link_static_flag that works with the bundled CC?
+ wl='-Wl,'
+ dll_cflags='+Z'
+ ;;
+
+ irix[[5-9]]*)
+ wl='-Wl,'
+ # PIC (with -KPIC) is the default.
+ ;;
+
+ os2*)
+ # We can build DLLs from non-PIC.
+ ;;
+
+ osf[[3-9]]*)
+ # All OSF/1 code is PIC.
+ wl='-Wl,'
+ ;;
+
+ aix[[3-9]]*)
+ # All AIX code is PIC.
+ wl='-Wl,'
+ ;;
+
+ sco3.2v5*)
+ dll_cflags='-belf -Kpic'
+ wl='-Wl,'
+ ;;
+
+ unixware*)
+ dll_cflags="-KPIC"
+ wl="-Wl,"
+ ;;
+
+ sysv4*)
+ dll_cflags="-KPIC"
+ wl="-Wl,"
+ ;;
+
+ sysv5*)
+ dll_cflags="-KPIC"
+ wl="-Wl,"
+ ;;
+
+ solaris2*)
+ dll_cflags='-KPIC'
+ wl='-Wl,'
+ ;;
+
+ sunos4*)
+ dll_cflags='-PIC'
+ wl='-Qoption ld '
+ ;;
+
+ uts4*)
+ dll_cflags='-pic'
+ ;;
+
+ *)
+ can_build_shared=no
+ ;;
+ esac
+fi
+
+if test -n "$dll_cflags"; then
+ AC_MSG_RESULT([${dll_cflags}])
+
+ # Check to make sure the dll_cflags actually works.
+ AC_MSG_CHECKING([if PIC flag ${dll_cflags} really works])
+ save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $dll_cflags -DPIC"
+ AC_TRY_COMPILE(,[int x=0;],[
+ # On HP-UX, the stripped-down bundled CC doesn't accept +Z, but also
+ # reports no error. So, we need to grep stderr for (Bundled).
+ if grep '(Bundled)' config.log >/dev/null; then
+ AC_MSG_RESULT(no)
+ can_build_shared=no
+ dll_cflags=
+ else
+ AC_MSG_RESULT(yes)
+ fi], [AC_MSG_RESULT(no)
+ can_build_shared=no
+ dll_cflags=])
+ CFLAGS="$save_CFLAGS"
+else
+ AC_MSG_RESULT(none)
+fi
+
+dnl
+dnl Now comes the LD trickery. We do things differently to libtool here.
+dnl I believe that libtool is incorrect in trying to drive the linker
+dnl directly. This can cause considerable problems if the module you are
+dnl compiling has C++ or other static initializers. If we use ld directly,
+dnl we don't end up with the crt stuff being linked in, and we don't end up
+dnl with any .init or .fini sections (or the moral equivalent thereof).
+dnl gcc takes great care to do this properly when invoked in -shared
+dnl mode, and we really do want this behavior. Perhaps the libtool folks
+dnl are not aware that any SVR4 based dynamic loader will automatically
+dnl execute code in the .init section before dlopen() returns. This is
+dnl vital, as the module may have been compiled to rely on that behavior.
+dnl
+dnl So, having said all of that, we diverge from libtool significantly
+dnl here. We want to try and use the C compiler as much as possible. Only
+dnl if the C compiler itself cannot create shared libraries to we try to
+dnl find the linker.
+dnl
+dnl The other advantage to my scheme is that it removes the dependancy
+dnl on a given compiler version remaining static with relation to the
+dnl version of XEmacs. With the libtool way, it picks up the linker that
+dnl gcc uses, which can be the internal collect2 that comes with gcc.
+dnl If the user ever changes their compiler version, the paths will no
+dnl longer be correct, and ellcc will break. This is clearly unacceptable.
+dnl By using the compiler driver on the path, we don't have this problem.
+dnl If that is not clear, consider that gcc -print-prog-name=ld can
+dnl produce something along the lines of:
+dnl /usr/local/lib/gcc-lib/OS-NAME/GCC-VERSION/ld
+dnl If you ever change GCC versions, then that path no longer exists.
+dnl
+dnl So, we change the check order here. We first check to see if we are
+dnl using GCC, and if so, we see if -shared works. If it does, great.
+dnl If we are not using gcc, but the system C compiler can produce
+dnl shared objects, we try that. Only if all of that fails do we revert
+dnl back to the libtool ld trickery.
+dnl
+dnl We don't do ANY of this if we can't produce shared objects.
+dnl
+if test "$can_build_shared" = "yes"; then
+cc_produces_so=no
+xldf=
+xcldf=
+AC_MSG_CHECKING(if C compiler can produce shared libraries)
+if test "$XEGCC" = yes -o "$__ICC" = yes; then
+ xcldf="-shared"
+ xldf="-shared"
+else # Not using GCC
+ case "$xehost_os" in
+ aix[[3-9]]*)
+ xldf="-bE:ELLSONAME.exp -H512 -T512 -bhalt:4 -bM:SRE -bnoentry -lc"
+ xcldf="${wl}-bE:ELLSONAME.exp ${wl}-H512 ${wl}-T512 ${wl}-bhalt:4 ${wl}-bM:SRE ${wl}-bnoentry ${wl}-lc"
+ ;;
+
+ freebsd2* | netbsd* | openbsd*)
+ xldf="-Bshareable"
+ xcldf="${wl}-Bshareable"
+ ;;
+
+ freebsd3*)
+ xcldf="-shared"
+ ;;
+
+ hpux*)
+ xldf="-b +s"
+ xcldf="${wl}-b ${wl}+s"
+ ;;
+
+ irix[[5-9]]* | osf[[3-9]]*)
+ xcldf="${wl}-shared"
+ xldf="-shared"
+ ;;
+
+ sco3.2v5* | unixware* | sysv5* | sysv4* | solaris2* | solaris7* | uts4*)
+ xcldf="-G"
+ xldf="-G"
+ ;;
+
+ sunos4*)
+ xcldf="${wl}-assert ${wl}pure-text ${wl}-Bstatic"
+ xldf="-assert pure-text -Bstatic"
+ ;;
+ esac
+fi # End if if we are using gcc
+
+if test -n "$xcldf"; then
+ save_LDFLAGS=$LDFLAGS
+ save_LIBS=$LIBS
+ save_xe_libs=$xe_libs
+ LDFLAGS="$xcldf $LDFLAGS"
+ LIBS=
+ xe_libs=
+ ac_link='${CC-cc} -o conftest $CFLAGS '"$xe_cppflags $xe_ldflags"' conftest.$ac_ext '"$xe_libs"' 1>&AC_FD_CC'
+ AC_TRY_LINK(,[int x=0;],cc_produces_so=yes,cc_produces_so=no)
+ LDFLAGS=$save_LDFLAGS
+ LIBS=$save_LIBS
+ xe_libs=$save_xe_libs
+ ac_link='${CC-cc} -o conftest $CFLAGS '"$xe_cppflags $xe_ldflags"' conftest.$ac_ext '"$xe_libs"' 1>&AC_FD_CC'
+else
+ cc_produces_so=no
+fi
+AC_MSG_RESULT([${cc_produces_so}])
+
+LTLD=$LD
+if test -z "$LTLD"; then
+ ac_prog=ld
+ if test "$XEGCC" = yes; then
+ # Check if gcc -print-prog-name=ld gives a path.
+ AC_MSG_CHECKING(for ld used by GCC)
+ ac_prog=`($CC -print-prog-name=ld) 2>&5`
+ case "$ac_prog" in
+ # Accept absolute paths.
+ /*)
+ if test -z "$LTLD"; then
+# case "$ac_prog" in
+# *gcc-lib*) LTLD="$CC"
+# ;;
+# *)
+ LTLD="$ac_prog"
+# ;;
+# esac
+ fi
+ ;;
+ "")
+ # If it fails, then pretend we aren't using GCC.
+ ac_prog=ld
+ ;;
+ *)
+ # If it is relative, then search for the first ld in PATH.
+ with_gnu_ld=unknown
+ ;;
+ esac
+ else
+ AC_MSG_CHECKING(for GNU ld)
+ fi
+
+ if test -z "$LTLD"; then
+ IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:"
+ for ac_dir in $PATH; do
+ test -z "$ac_dir" && ac_dir=.
+ if test -f "$ac_dir/$ac_prog"; then
+ LTLD="$ac_dir/$ac_prog"
+ # Check to see if the program is GNU ld. I'd rather use --version,
+ # but apparently some GNU ld's only accept -v.
+ # Break only if it was the GNU/non-GNU ld that we prefer.
+ if "$LTLD" -v 2>&1 < /dev/null | egrep '(GNU|with BFD)' > /dev/null; then
+ xe_gnu_ld=yes
+ else
+ xe_gnu_ld=no
+ fi
+ fi
+ done
+ IFS="$ac_save_ifs"
+ fi
+
+ if test -n "$LTLD"; then
+ AC_MSG_RESULT([${LTLD}])
+ else
+ AC_MSG_RESULT(no)
+ fi
+
+ if test -z "$LTLD" -a "$cc_produces_so" = no; then
+ AC_MSG_ERROR(no acceptable linker found in \$PATH)
+ exit 1
+ fi
+fi
+
+dnl
+dnl Order of the tests changed somewhat to prevent repetition
+dnl
+ld_dynamic_link_flags=
+
+# Check to see if it really is or isn't GNU ld.
+AC_MSG_CHECKING(if the linker is GNU ld)
+# I'd rather use --version here, but apparently some GNU ld's only accept -v.
+if $LTLD -v 2>&1 </dev/null | egrep '(GNU|with BFD)' 1>&5; then
+ xe_gnu_ld=yes
+else
+ xe_gnu_ld=no
+fi
+AC_MSG_RESULT([${xe_gnu_ld}])
+
+case "$xehost_os" in
+ amigaos* | sunos4*)
+ # On these operating systems, we should treat GNU ld like the system ld.
+ gnu_ld_acts_native=yes
+ ;;
+ *)
+ gnu_ld_acts_native=no
+ ;;
+esac
+
+if test "$cc_produces_so" = "yes"; then
+ dll_ld=$CC
+ dll_ldflags=$xcldf
+ can_build_shared=yes
+ ld_shlibs=yes
+else
+ # OK - only NOW do we futz about with ld.
+ # See if the linker supports building shared libraries.
+ AC_MSG_CHECKING(whether the linker supports shared libraries)
+ dll_ld=$CC
+ dll_ldflags=$LDFLAGS
+ ld_shlibs=yes
+ can_build_shared=yes
+ if test "$xe_gnu_ld" = yes && test "$gnu_ld_acts_native" != yes; then
+ # See if GNU ld supports shared libraries.
+ if $LTLD --help 2>&1 | egrep ': supported targets:.* elf' > /dev/null; then
+ dll_ld=$CC
+ dll_ldflags="-shared"
+ ld_shlibs=yes
+ else
+ ld_shlibs=no
+ fi
+ else
+ # PORTME fill in a description of your system's linker (not GNU ld)
+ case "$xehost_os" in
+ aix3*)
+ dll_ld=$LTLD
+ dll_ldflags=$xldf
+ ;;
+
+ aix[[4-9]]*)
+ dll_ldflags=$xcldf
+ ;;
+
+ # FreeBSD 2.2.[012] allows us to include c++rt0.o to get C++ constructor
+ # support. Future versions do this automatically, but an explicit c++rt0.o
+ # doesn't break anything, and helps significantly (at the cost of a little
+ # extra space).
+ freebsd2.2*)
+ dll_ld=$LTLD
+ dll_ldflags=$xldf
+ dll_post="/usr/lib/c++rt0.o"
+ ;;
+
+ # Unfortunately, older versions of FreeBSD 2 don't have this feature.
+ freebsd2*)
+ dll_ld=$LTLD
+ dll_ldflags="-Bshareable"
+ ;;
+
+ # FreeBSD 3, at last, uses gcc -shared to do shared libraries.
+ freebsd3*)
+ dll_ldflags="-shared"
+ ;;
+
+ hpux*)
+ dll_ld=$LTLD
+ dll_ldflags=$xldf
+ ;;
+
+ irix[[5-9]]*)
+ dll_ld=$LTLD
+ dll_ldflags=$xldf
+ ;;
+
+ netbsd*)
+ # Tested with NetBSD 1.2 ld
+ dll_ld=$LTLD
+ dll_ldflags=$xldf
+ ;;
+
+ openbsd*)
+ dll_ld=$LTLD
+ dll_ldflags=$xldf
+ ;;
+
+ osf3* | osf4*)
+ dll_ld=$LTLD
+ dll_ldflags=$xldf
+ ;;
+
+ # For both SCO and Solaris we MAY want to have LDFLAGS include -z text
+ sco3.2v5* | unixware* | sysv5* | sysv4* | solaris2* | solaris7*)
+ dll_ld=$LTLD
+ case "$dll_ld" in
+ *gcc*) dll_ldflags="-shared"
+ dll_ld=$CC
+ ;;
+ *) dll_ldflags="-G"
+ ;;
+ esac
+ ;;
+
+ sunos4*)
+ if test "$XEGCC" = yes; then
+ dll_ld=$CC
+ else
+ dll_ld=$LTLD
+ fi
+ dll_ldflags=$xldf
+ ;;
+
+ uts4*)
+ dll_ld=$LTLD
+ dll_ldflags="-G"
+ ;;
+
+ bsdi*)
+ dll_ldflags="-r"
+ dll_ld="shlicc2"
+ ;;
+
+ *)
+ ld_shlibs=no
+ can_build_shared=no
+ ;;
+ esac
+ fi
+ AC_MSG_RESULT([${ld_shlibs}])
+ if test "$ld_shlibs" = "no"; then
+ can_build_shared=no
+ fi
+fi # End of if cc_produces_so = no
+
+dnl
+dnl Last thing, check how to get a linked executable to have its symbols
+dnl exported, so that the modules have access to them.
+dnl
+dnl XEmacs FIXME - we need to set ld_dynamic_link_flags properly for
+dnl most of these systems, which was missing from libtool. I know they
+dnl all have a way of doing this, but someone needs to look at this
+dnl for each OS and make sure it is correct. Remember that the arguments
+dnl are passed when temacs is linked, this is NOT for modules. The sole
+dnl purpose of the argument is to get the internal XEmacs symbols exposed
+dnl for modules to use. This means that the COMPILER (and NOT the linker)
+dnl is most often used to create temacs, so arguments to the linker will
+dnl usually need to be prefix with ${wl} or some other such thing.
+dnl
+
+if test "$xe_gnu_ld" = yes; then
+ if test "$ld_shlibs" = yes; then
+ ld_dynamic_link_flags="${wl}-export-dynamic"
+ fi
+fi
+
+if test -z "$ld_dynamic_link_flags"; then
+ case "$xehost_os" in
+ aix[[3-9]]*)
+ ld_dynamic_link_flags=
+ ;;
+
+ freebsd2.2*)
+ ld_dynamic_link_flags=
+ ;;
+
+ freebsd2*)
+ ld_dynamic_link_flags=
+ ;;
+
+ freebsd3*)
+ ld_dynamic_link_flags=
+ ;;
+
+ hpux*)
+ ld_dynamic_link_flags="${wl}-E"
+ ;;
+
+ irix[[5-9]]*)
+ ld_dynamic_link_flags=
+ ;;
+
+ netbsd*)
+ ld_dynamic_link_flags=
+ ;;
+
+ openbsd*)
+ ld_dynamic_link_flags=
+ ;;
+
+ osf3* | osf4*)
+ ld_dynamic_link_flags=
+ ;;
+
+ solaris2* | solaris7*)
+ ld_dynamic_link_flags=
+ ;;
+
+ sco3.2v5* | unixware* | sysv5* | sysv4*)
+ ld_dynamic_link_flags="${wl}-Bexport"
+ ;;
+
+ sunos4*)
+ ld_dynamic_link_flags=
+ ;;
+
+ uts4*)
+ ld_dynamic_link_flags=
+ ;;
+
+ bsdi*)
+ ld_dynamic_link_flags=
+ ;;
+
+ esac
+fi # End of if -z ld_dynamic_link_flags
+fi # End of if test "$can_build_shared" = "yes"
+
AC_SUBST(dll_ld)
AC_SUBST(dll_cflags)
-AC_SUBST(dll_oflags)
-AC_SUBST(dll_lflags)
+AC_SUBST(dll_ldflags)
+AC_SUBST(dll_post)
+AC_SUBST(dll_ldo)
+AC_SUBST(ld_dynamic_link_flags)
])dnl
+
projects / chise / xemacs-chise.git.1 / blobdiff