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Hi all,
in the auxililary library gwenhywfar we've added a new feature: The
runtime paths are now looked up in a relocatable way, i.e. the --prefix
at runtime doesn't necessarily have to be the same as the --prefix at
compile time. This is implemented by the help of the "binreloc" source
snippet, and in any case it's a pure additional feature - if it doesn't
work, the code will always fall back to the conventional compiled-in paths.
If you want to test this: Apply the attached patch which simply adds a
number of printf's. Then install gwenhywfar as normal (I did this with
- --prefix=/home/stimming/usr) and in src/, run the ./testlib, which will
give you this output:
$ ./testlib
br_init_lib: Found /home/stimming/usr/lib/libgwenhywfar.so.38.7.1
br_find_prefix: Returning /home/stimming/usr
br_find_prefix: Returning /home/stimming/usr
br_find_prefix: Returning /home/stimming/usr
get_plugindir: Found /home/stimming/usr/lib/gwenhywfar/plugins/38
Check 1 ...PASSED.
which says the binreloc code could successfully lookup the installation
location of the libgwenhywfar.so file at runtime, and it derived the
$prefix and the plugindir accordingly. So far, so good. Now change the
actual install prefix, like this:
mv $HOME/usr $HOME/ussr
which will clearly fail if we still relied on the compiled-in paths. But
with the latest SVN code (and the necessary LD_LIBRARY_PATH), you will get
$ LD_LIBRARY_PATH=$HOME/ussr/lib ./testlib
br_init_lib: Found /home/stimming/ussr/lib/libgwenhywfar.so.38.7.1
br_find_prefix: Returning /home/stimming/ussr
br_find_prefix: Returning /home/stimming/ussr
br_find_prefix: Returning /home/stimming/ussr
get_plugindir: Found /home/stimming/ussr/lib/gwenhywfar/plugins/38
Check 1 ...PASSED.
which says the binreloc code could successfully lookup the *changed*
installation location, and it derived the $prefix and plugindir
accordingly. Voilà.
Note that this won't work for *compiling* a derived application with
such a changed installation path though, but this whole feature is
designed for *running* an application at an arbitrary installation path,
as is used by http://www.autopackage.org . Also note that this feature
is used on Linux/Unix only (no idea about Mac OSX); on Windows, we've
been looking up the paths from registry keys that have been written at
install-time.
Christian
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Index: testlib.c
===================================================================
--- testlib.c (revision 1095)
+++ testlib.c (working copy)
@@ -6,9 +6,9 @@
#include <gwenhywfar/debug.h>
#include <gwenhywfar/md.h>
#include <gwenhywfar/padd.h>
+#include "gwenhywfar.h"
-
int check1() {
const char *testString="01234567890123456789";
int rv;
@@ -320,6 +320,7 @@
else
cmd="check";
+ GWEN_Init();
if (strcasecmp(cmd, "check")==0) {
rv=check1();
if (rv)
Index: gwenhywfar.c
===================================================================
--- gwenhywfar.c (revision 1096)
+++ gwenhywfar.c (working copy)
@@ -533,6 +533,7 @@
free (pkglibdir);
free (tmp);
+ printf("get_plugindir: Found %s\n", result);
return result;
}
Index: binreloc.c
===================================================================
--- binreloc.c (revision 1095)
+++ binreloc.c (working copy)
@@ -313,6 +313,7 @@
br_init (BrInitError *error)
{
exe = _br_find_exe (error);
+ printf("br_init: Found %s\n", exe);
return exe != NULL;
}
@@ -335,6 +336,7 @@
br_init_lib (BrInitError *error)
{
exe = _br_find_exe_for_symbol ((const void *) "", error);
+ printf("br_init_lib: Found %s\n", exe);
return exe != NULL;
}
@@ -420,6 +422,7 @@
dir1 = br_dirname (exe);
dir2 = br_dirname (dir1);
free (dir1);
+ printf("br_find_prefix: Returning %s\n", dir2);
return dir2;
}
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