[yocto] [prelink-cross] [PATCH 1/1] debug-for-missing-loader-and-libc

[Maninder Singh]

Hi,

During cross prelink if we miss out ld-linux.so.* or libc.so.* It prints below info:
./prelink: /test_binary: Could not parse `prelink-rtld: dl-version.c:219: rtld_check_map_versions:
 Assertion `needed != ((void *)0)' failed.'

And thus we miss actual cause for this failure,  by this patch we will know failure reason.
./prelink: /test_binary: Could not parse `./prelink-rtld: error while loading shared libraries: ld-linux.so.3'
(In this case ld-linux.so.3 was missing)

Signed-off-by: Maninder Singh <maninder1.s at samsung.com>
Signed-off-by: Vaneet Narang <v.narang at samsung.com>
Reviewed-by: Ajeet Yadav <ajeet.v at samsung.com>
Reviewed-by: Geon-ho Kim <gh007.kim at samsung.com>
---
 src/rtld/dl-version.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/src/rtld/dl-version.c b/src/rtld/dl-version.c
index e4040a6..eb62943 100644
--- a/src/rtld/dl-version.c
+++ b/src/rtld/dl-version.c
@@ -216,6 +216,12 @@ _dl_check_map_versions (struct ldlibs_link_map *map, int verbose, int trace_mode
      /* If NEEDED is NULL this means a dependency was not found
         and no stub entry was created.  This should never happen.  */
+     if(needed == NULL)
+       {
+         _dl_signal_error (errval, NULL, NULL, strtab + ent->vn_file);
+         printf("error while loading shared libraries: %s", strtab + ent->vn_file);
+         exit(0);
+       }
      assert (needed != NULL);
      /* Make sure this is no stub we created because of a missing
--
1.7.1

And also if it is ok we can remove this one --- assert (needed != NULL); 
because we are using exit(0) for (needed==NULL) 

Thanks,
Maninder Singh