Re: [RFA] Check solib bfd arch

[Joel Brobecker <brobecker at adacore dot com>]

Hello,

The following patch is causing trouble on sparc-solaris:

> 2009-07-08  Hui Zhu  <teawater@gmail.com>
> 
> 	* solib.c (solib_bfd_open): Output a warning if solib's
> 	architecture is not compatible with inferior's architecture.

I now see:

    (gdb) run
    Starting program: /[...]/sparc64/ex/task_switch 
    warning: `/usr/platform/SUNW,Sun-Fire-V440/lib/sparcv9/libc_psr.so.1': Shared library architecture sparc:v9a is not compatible with target architecture sparc:v9.

> +  if (b->compatible (b, bfd_get_arch_info (abfd)) != b)

In my case, b->compatible is bfd_default_compatible. the architecture
is set to sparc:v9, and the shared library's architecture is sparc:v9a.
The problem is that b->compatible is returning the architecture that
is "more featureful" of the two, which in this case is sparc:v9a.
As a result, we emit the warning.

Looks to me like the check is too aggressive and should be changed
to == 0. Would that be correct?

2009-09-16  Joel Brobecker  <brobecker@adacore.com>

        * solib.c (solib_bfd_open): Relax a bit the compatibility check.

Tested on sparc64-solaris.

-- 
Joel

diff --git a/gdb/solib.c b/gdb/solib.c
index c7fd0fc..a2ad0c4 100644
--- a/gdb/solib.c
+++ b/gdb/solib.c
@@ -310,7 +310,7 @@ solib_bfd_open (char *pathname)
 
   /* Check bfd arch.  */
   b = gdbarch_bfd_arch_info (target_gdbarch);
-  if (b->compatible (b, bfd_get_arch_info (abfd)) != b)
+  if (!b->compatible (b, bfd_get_arch_info (abfd)))
     warning (_("`%s': Shared library architecture %s is not compatible "
                "with target architecture %s."), found_pathname,
              bfd_get_arch_info (abfd)->printable_name, b->printable_name);