patch_libtool_on_darwin_pass_all

libtool 1.4.x on darwin uses a lib_check with a file_magic that tests for "Mach-O dynamically linked shared library". However, this is the file_magic for ".dylib" sharedlibraries but not for ".so" sharedlibraries. They have another "file -L" result of "Mach-O bundle ppc", which has an annoying result: when a a module (a .so) is dependent on another module (another .so) then libtool will error out and say that the import-module was not found where in fact it is available. It does not even try to call the real linker.

Later libtool generations have changed the processing, the import file_check has been changed from "file_magic" to "pass_all". This ac-macro does a similar thing: it checks for the darwin host, it checks for the check_method, and when it was not "pass_all" then we set it to "deplibs_check_method=pass_all"

AC_DEFUN([PATCH_LIBTOOL_ON_DARWIN_PASS_ALL],
[# libtool-1.4 specific, on darwin set deplibs_check_method=pass_all
case "$host_os" in
  darwin*)
    if grep "^deplibs_check_method=.*file_magic" libtool >/dev/null ; then
AC_MSG_RESULT(patching libtool to set deplibs_check_method=pass_all)
      test -f libtool.old || (mv libtool libtool.old && cp libtool.old libtool)
      sed -e '/^deplibs_check_method=/s/=.*/="pass_all"/' libtool >libtool.new
      (test -s libtool.new || rm libtool.new) 2>/dev/null
      test -f libtool.new && mv libtool.new libtool # not 2>/dev/null !!
      test -f libtool     || mv libtool.old libtool
    fi
  ;;
esac
])

Copyright © 2006 Guido U. Draheim <guidod@gmx.de>

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