dnl sxe-linker.m4 -- Linker stuff, esp. dynamic linking
dnl needed for emodules for one
-dnl that's a too fucking long thing, split it!
-AC_DEFUN([SXE_SHLIB_STUFF],[
-dll_ld=
-dll_ldflags=
-dll_cflags=
-dll_post=
-dll_ldo="-o"
-ld_dynamic_link_flags=
-xehost=$ac_cv_build
-xealias=$ac_cv_build_alias
-
-AC_MSG_CHECKING([how to build dynamic libraries for ${xehost}])
-AC_MSG_RESULT([])
-# Transform *-*-linux* to *-*-linux-gnu*, to support old configure scripts.
-case "$xehost" in
-*-*-linux-gnu*) ;;
-*-*-linux*) xehost=`echo $xehost | sed 's/^\(.*-.*-linux\)\(.*\)$/\1-gnu\2/'`
-esac
-
-xehost_cpu=`echo $xehost | sed 's/^\([[^-]]*\)-\([[^-]]*\)-\(.*\)$/\1/'`
-xehost_vendor=`echo $xehost | sed 's/^\([[^-]]*\)-\([[^-]]*\)-\(.*\)$/\2/'`
-xehost_os=`echo $xehost | sed 's/^\([[^-]]*\)-\([[^-]]*\)-\(.*\)$/\3/'`
-
-case "$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([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.
- ;;
-
- *darwin*) dll_cflags='-dynamic'
- ;;
-
- 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'
- ;;
- *)
- 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 $dll_cflags -DPIC"
- AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int x=0;]])],[
- # On HP-UX, the stripped-down bundled CC doesn't accept +Z, but also
- # reports no error. So, we need to grep stderr for (Bundled).
- if grep '(Bundled)' config.log >/dev/null; then
- AC_MSG_RESULT(no)
- can_build_shared=no
- dll_cflags=
- else
- AC_MSG_RESULT(yes)
- fi], [AC_MSG_RESULT(no)
- can_build_shared=no
- dll_cflags=])
- CFLAGS="$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 do 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 "$__ICC" = "yes"; then
- case "$xehost_os" in
- *darwin*)
- xcldf='-bundle'
- xldf='-bundle -undefined suppress -flat_namespace'
- ;;
- *)
- xcldf="-shared"
- xldf="-shared"
- ;;
- esac
-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
- SXE_DUMP_LIBS
- LDFLAGS="$xcldf $LDFLAGS"
- LIBS=
-dnl xe_libs=
-dnl ac_link='${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS '"$xe_cppflags $xe_ldflags"' conftest.$ac_ext '"$xe_libs"' 1>&AS_MESSAGE_LOG_FD'
- AC_LINK_IFELSE([AC_LANG_SOURCE([[int x=0;]])],
- [cc_produces_so=yes], [cc_produces_so=no])
- SXE_RESTORE_LIBS
-dnl ac_link='${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS '"$xe_cppflags $xe_ldflags"' conftest.$ac_ext '"$xe_libs"' 1>&AS_MESSAGE_LOG_FD'
- :
-else
- cc_produces_so=no
-fi
-AC_MSG_RESULT([${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=$CC
- case "$xehost_os" in
- *darwin*)
- dnl On Darwin, we test with xcldf, but we use xldf
- dll_ldflags=$xldf
- ;;
- *)
- dll_ldflags=$xcldf
- ;;
- esac
- 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=
- ;;
-
- *darwin*)
- 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_ldflags)
-AC_SUBST(dll_post)
-AC_SUBST(dll_ldo)
-AC_SUBST(ld_dynamic_link_flags)
-])dnl SXE_SHLIB_STUFF
-
AC_DEFUN([SXE_CHECK_LD_ZFLAG], [dnl
pushdef([LD_ZFLAG], [$1])
projects / sxemacs / commitdiff