Re: [Ltib] Ubuntu 12.04 vs 10.04 libc.so libpthread.so absolute path removal

[Sale, Devin M]

Thanks for the explanation Stuart.

I see the latest revision 1.8 of base_libs.spec addresses the issue.
That patch works for me on Ubuntu 12.04 and 10.04.

-----Original Message-----
From: Stuart Hughes [mailto:address@hidden
Sent: Friday, August 31, 2012 3:48 AM
To: Sale, Devin M
Cc: address@hidden
Subject: Re: [Ltib] Ubuntu 12.04 vs 10.04 libc.so libpthread.so absolute path 
removal

On 30/08/12 20:57, Sale, Devin M wrote:
> Hi,
>
> In the base_libs.spec there's this little bit of perl code.
>
> # remove absolute paths from text search files (if they exist)
> perl -w -e '
>      @ARGV = grep { `file $_` =~ m,ASCII C program text|, } @ARGV;
>      exit(0) unless @ARGV;
>      $^I = ".bak";
>      while(<>) {
>          s,[\S/]+/,,g if m,^GROUP,;
>          print;
>      }
>      ' $RPM_BUILD_ROOT/%{pfx}/lib/libc.so \
>        $RPM_BUILD_ROOT/%{pfx}/lib/libpthread.so \
>        $RPM_BUILD_ROOT/%{pfx}/usr/lib/libc.so \
>        $RPM_BUILD_ROOT/%{pfx}/usr/lib/libpthread.so
>
> which does what the comment says and leaves a libc.so.bak and 
> lipthread.so.bak in the rootfs.
>
> When moving LTIB from Ubuntu 10.04 to 12.04 the *.bak files go away because 
> the file utility changed like this:
> On 10.04:
> address@hidden:~$ file libc.so.bak
> libc.so.bak: ASCII C program text
>
> On 12.04:
> dzq92s:~$ file libc.so
> libc.so: ASCII English text
>
>
> Why remove the absolute paths?
>
> What is the ramification of not doing this?
>
> Should the *.bak files be left in the rootfs?
>
>

Hi Devin,

I can't remember exactly why you need to remove the absolute paths (I
wrote this at least 5 years ago), but you do.  I think it was so that
you can re-locate the libraries to not be in /usr/lib, but without my
notes I can't be sure.  Just thought of one more; another reason is that
we copy (not build) the C library from the cross compiler.  If this was
not build in a standard way (standard prefix), the paths in these files
will be incorrect.

The *.bak files are left so you can see what was there before the
change, and a change was made.  You can remove them if you like, but
they do no harm.

Regards, Stuart




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