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Re: set sysroot command on AIX has no effect.
Hi Ulrich,
Thanks for the review and comments.
If we call solib_bfd_open for .a files then the call to open file using
gdb_open_cloexec inside solib_find function is failing.
The reason for this is,
we will be getting library information from ld_info in the form of
"/usr/lib/libc.a(shr.o)", but actually we will be having the
file in filesystem as /usr/lib/libc.a. This is the reason initially i
didn't use solib_bfd_open.
But i experimented some more and tried to see how gdb behaves if we pass
modified pathname exactly as the file which we are having in the machine,
like "/usr/lib/libc.a".
Then bfd bfd_check_format is failing with the error "not in executable
format".
Looks like bfd isn't able to recognise the .a archives.
I can have a look on why bfd check is failing.
Please let me know if this is the right way to move forward or you have
any suggestions.
Thanks,
-Sangamesh
From: "Ulrich Weigand" <uweigand@de.ibm.com>
To: Sangamesh Mallayya/India/IBM@IBMIN
Cc: gdb-patches@sourceware.org
Date: 09/29/2016 08:52 PM
Subject: Re: set sysroot command on AIX has no effect.
Sangamesh Mallaya wrote:
> set sysroot command on AIX has no effect if a program depends on shared
> library archives (.a).
Yes, that seems a bug.
> + /* If gdb_sysroot is set via set sysroot command,
> + then we need to prefix gdb_sysroot to shared library path */
> + /* .a shared library archives case */
> + if (gdb_sysroot != NULL && *gdb_sysroot != 0) {
> + sys_path = alloca (sizeof(gdb_sysroot)+strlen(pathname));
> + memset (sys_path, 0, sizeof(sys_path));
> + strcpy(sys_path, gdb_sysroot);
> + pathname = strcat (sys_path, pathname);
> + }
> + path_len = strlen (pathname);
This duplicates some of the logic in solib_find. It would be better
to avoid that duplication ...
Is there any reason why you cannot use solib_find / solib_bfd_fopen
to open the archive file, like solib_bfd_open does? This would ensure
we're always using the same search logic for .a files as for .so files.
Bye,
Ulrich
--
Dr. Ulrich Weigand
GNU/Linux compilers and toolchain
Ulrich.Weigand@de.ibm.com