From: Ralf Hildebrandt (Ralf.Hildebrandtcharite.de)
Date: Fri May 02 2008 - 04:11:01 CDT

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* Ralf Hildebrandt <Ralf.Hildebrandtcharite.de>:
> David and I were wondering why the cleanup deamon is being linked
> against libssl.
>
> I had a naive look:
>
> postamt:/usr/src/postfix-2.6-20080411/src/cleanup# fgrep -i ssl *
> Binary file cleanup matches
> Makefile:SYSLIBS = -lpcre -lssl -lcrypto -lcdb -ldb -lnsl -lresolv
> Makefile:EXPORT = AUXLIBS='-lpcre -lssl -lcrypto -lcdb' CCARGS='-DHAS_CDB -DUSE_TLS -DHAS_PCRE -DUSE_SASL_AUTH -DDEF_SERVER_SASL_TYPE=\"dovecot\" -DSNAPSHOT' OPT='-O' DEBUG='-g'
>
> So, I don't think linking in libssl would be necessary. But what do I
> know, so I think I'd rather ask.

David found http://www.gentoo.org/proj/en/qa/asneeded.xml, and I
recompiled Postfix using those (GNU ld specific) options
"-Wl,--as-needed" on my Linux box:

make tidy
CCARGS="`pkg-config --cflags libssl libcrypto libpcre` -DUSE_TLS -DHAS_PCRE -DHAS_CDB" \
AUXLIBS="-Wl,--as-needed `pkg-config --libs libssl libcrypto libpcre` -lcdb" make -j 4 makefiles &&
make -j 4 && postfix stop; make -j 4 upgrade && postfix start && sleep 2 && postfix flush

After that, cleanup and pipe (to name but a few) were linked
differently:

Before:

$ ldd /usr/libexec/postfix/cleanup
linux-gate.so.1 => (0xb7f75000)
libssl.so.0.9.8 => /usr/lib/i686/cmov/libssl.so.0.9.8 (0xb7f24000)
libcrypto.so.0.9.8 => /usr/lib/i686/cmov/libcrypto.so.0.9.8 (0xb7dda000)
libpcre.so.3 => /usr/lib/libpcre.so.3 (0xb7db2000)
libcdb.so.1 => /usr/lib/libcdb.so.1 (0xb7dae000)
libdb-4.5.so => /usr/lib/libdb-4.5.so (0xb7c94000)
libnsl.so.1 => /lib/i686/cmov/libnsl.so.1 (0xb7c7c000)
libresolv.so.2 => /lib/i686/cmov/libresolv.so.2 (0xb7c69000)
libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb7b1b000)
libdl.so.2 => /lib/i686/cmov/libdl.so.2 (0xb7b16000)
libz.so.1 => /usr/lib/libz.so.1 (0xb7b01000)
libpthread.so.0 => /lib/i686/cmov/libpthread.so.0 (0xb7ae9000)
/lib/ld-linux.so.2 (0xb7f76000)

After:
# ldd /usr/libexec/postfix/cleanup
linux-gate.so.1 => (0xb7eb6000)
libpcre.so.3 => /usr/lib/libpcre.so.3 (0xb7e83000)
libcdb.so.1 => /usr/lib/libcdb.so.1 (0xb7e7f000)
libdb-4.5.so => /usr/lib/libdb-4.5.so (0xb7d64000)
libnsl.so.1 => /lib/i686/cmov/libnsl.so.1 (0xb7d4c000)
libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb7bfe000)
libpthread.so.0 => /lib/i686/cmov/libpthread.so.0 (0xb7be6000)
/lib/ld-linux.so.2 (0xb7eb7000)

Before:
-rwxr-xr-x 1 root root 930992 2. Mai 11:06 /usr/libexec/postfix/cleanup

After:
-rwxr-xr-x 1 root root 981356 2. Mai 10:54 /usr/libexec/postfix/cleanup

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