Re: HAVE_DLADDR not being defined?

[SPUeNTRUP - Kai Henningsen]

Hello David,

Am Thu, 9 Sep 2010 15:20:23 +0100
schrieb David Chisnall <address@hidden>:

> The dladdr() test is failing for me, and presumably a lot of other people, 
> because the compile command for this test contains -ldl.  It then complains 
> that the dl library can not be found.  On GNU/Linux and *BSD (and Solaris?), 
> dladdr() is provided by libc, so this flag is not needed.
> 
> Can someone who understands the configure stuff have a go at fixing this?

Looking at ltdl.m4, it seems that a solution would be something similar to

AC_SEARCH_LIBS([dlopen], [dl],
        [AC_DEFINE([HAVE_LIBDL], [1],
                   [Define if you have the libdl library or equivalent.])
        if test "$ac_cv_search_dlopen" != "none required" ; then
          LIBADD_DLOPEN="-ldl"
        fi
        libltdl_cv_lib_dl_dlopen="yes"
        LT_DLLOADERS="$LT_DLLOADERS ${lt_dlopen_dir+$lt_dlopen_dir/}dlopen.la"],
    [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"
            LT_DLLOADERS="$LT_DLLOADERS 
${lt_dlopen_dir+$lt_dlopen_dir/}dlopen.la"],
        [AC_CHECK_LIB([svld], [dlopen],
                [AC_DEFINE([HAVE_LIBDL], [1],
                         [Define if you have the libdl library or equivalent.])
                LIBADD_DLOPEN="-lsvld" libltdl_cv_func_dlopen="yes"
                LT_DLLOADERS="$LT_DLLOADERS
                ${lt_dlopen_dir+$lt_dlopen_dir/}dlopen.la"])])])

Mit freundlichen Grüßen aus Münster /
with kind regards - Kai Henningsen

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