[CentOS-devel] Libraries not stripped in rebuilt rpms and larger packages

[Dag Wieers]

On Wed, 8 Jul 2009, Luigi Iotti wrote:

> I usually rebuild some CentOS rpm packges with some changes I need.
> I noticed that I obtain slightly larger packages than the ones found in the
> centOS distribution, even if I rebuild a source rpm without changing
> anything.
> I looked in it, and it turned out that my shared libraries are not stripped,
> where the ones found in your packages are.
> For example, I just rebuilt the openldap packages, and obtained a package
> that is about 3 times larger:
> -rw-r--r-- 1 root root 10899106 Jul  7 22:42
> my/openldap-servers-2.3.43-3.el5.lux.2.i386.rpm
> -rw-r--r-- 1 root root  3202917 Jul  8 16:38
> orig/openldap-servers-2.3.43-3.el5.i386.rpm
>
> I extracted the packages with rpm2cpio, and the difference in size are in
> the shared libraries, for example:
> # ls -l */usr/lib/libslapd_db-4.4.so
> -rwxr-xr-x 1 root root 6518365 Jul  8 16:42 my/usr/lib/libslapd_db-4.4.so
> -rwxr-xr-x 1 root root 1032880 Jan 21 10:00 orig/usr/lib/libslapd_db-4.4.so
> # file */usr/lib/libslapd_db-4.4.so
> my/usr/lib/libslapd_db-4.4.so:   ELF 32-bit LSB shared object, Intel 80386,
> version 1 (SYSV), not stripped
> orig/usr/lib/libslapd_db-4.4.so: ELF 32-bit LSB shared object, Intel 80386,
> version 1 (SYSV), stripped
>
> Maybe the CentOS build system contains some macros that strip libraries, and
> the distributed macros do not.
>
> I put this in /etc/rpm/macros (the line calling brp-strip-shared was added
> to the analogous macro taken from /usr/lib/rpm/redhat):
> %__os_install_post    \
>    /usr/lib/rpm/redhat/brp-compress \
>    %{!?__debug_package:/usr/lib/rpm/redhat/brp-strip %{__strip}} \
>    %{!?__debug_package:/usr/lib/rpm/redhat/brp-strip-shared %{__strip}} \
>    /usr/lib/rpm/redhat/brp-strip-static-archive %{__strip} \
>    /usr/lib/rpm/redhat/brp-strip-comment-note %{__strip} %{__objdump} \
>    /usr/lib/rpm/brp-python-bytecompile \
>    /usr/lib/rpm/redhat/brp-java-repack-jars \
> %{nil}
>
> Do you see any problems doing so?
> Why there is this difference between packages distributed by CentOS and the
> same packages rebuilt in a CentOS environment?

You need to install redhat-rpm-config for building packages, then a lot of 
additional macros are included by default.

-- 
--   dag wieers,  dag at wieers.com,  http://dag.wieers.com/   --
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