3e74e2e3bb
Normally one would dlopen() a shared object's basename, not its absolute
path. However, lib/krb5/plugin.c, in an effort to be zero-conf-ish,
wants to readdir() to find plugins to load, and in the process it ends
up defeating the RTLD's search-the-caller's-rpath.
This commit partially addresses this by allowing the use of $ORIGIN in
plugin_dir values and using them for the default (except on OS X).
This allows multiple Heimdal versions installed on the same host, but
with different plugin ABIs, to co-exist. A step forward for doing make
check on hosts where Heimdal is installed.
For now we hardcode $ORIGIN/../lib/plugin/krb5 (linux, Solaris, *BSD),
or $ORIGIN (Windows; for assemblies objects need to be in the same
directory) and we eval $ORIGIN by using dladdr() (Linux, Solaris) or
GetModuleHandleEx() (Win32, via a dladdr() wrapper in libroken) to find
the path to libkrb5 whose dirname to use as $ORIGIN. For Windows,
because we need the plugins to be in the same directory as libkrb5, we
require a prefix on plugin DLLs ("plugin_krb5_") to distinguish them
from other objects.
We should add a special token to mean "look in $ORIGIN, sure, but
dlopen() the plugin basenames only (so the RTLD can search the rpath)".
20 lines
381 B
Plaintext
20 lines
381 B
Plaintext
dnl
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dnl $Id$
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dnl
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AC_DEFUN([rk_DLOPEN], [
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AC_FIND_FUNC_NO_LIBS(dlopen, dl,[
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#ifdef HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif],[0,0])
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AM_CONDITIONAL(HAVE_DLOPEN, test "$ac_cv_funclib_dlopen" != no)
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])
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AC_DEFUN([rk_DLADDR], [
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AC_FIND_FUNC_NO_LIBS(dladdr, dl,[
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#ifdef HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif],[0,0])
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AM_CONDITIONAL(HAVE_DLADDR, test "$ac_cv_funclib_dladdr" != no)
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])
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