From kde-core-devel  Sun Apr 24 18:15:50 2005
From: Thiago Macieira <thiago () kde ! org>
Date: Sun, 24 Apr 2005 18:15:50 +0000
To: kde-core-devel
Subject: Re: how do libtool convinience libraries work ?
Message-Id: <200504241515.58138.thiago () kde ! org>
X-MARC-Message: https://marc.info/?l=kde-core-devel&m=111436657302510
MIME-Version: 1
Content-Type: multipart/mixed; boundary="--nextPart3235853.QYKLaSbnbR"

--nextPart3235853.QYKLaSbnbR
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

Alexander Neundorf wrote:
>If it is linked using libtool, the contents of the static lib are
> inserted into the shared lib.
>What does libtool magically do ?

Magic trickery :-)

>I mean, in the end it must come down to some gcc/ld/ar/ranlib options I
> think.
>
>So, can anybody shed some light on me, how can I have the same effect
>manually ?

Sure.

I've just found it out too:

$ nm m1.o
00000000 T func1
$ nm m2.o
00000000 T func2
$ ar r libconv.a m1.o
ar: creating libconv.a

Wrong way:
$ gcc -shared -o libshared.so m2.o libconv.a
$ nm libshared.so | grep func.
00000478 T func2

Right way:
$ gcc -shared -o libshared.so m2.o -Wl,--whole-archive libconv.a=20
=2DWl,--no-whole-archive
$ nm libshared.so | grep func.
0000049c T func1
00000494 T func2

So, note: don't forget the --no-whole-archive in the end, or ld will try=20
to include other system libraries into your library.

Hint: use -nostdlib as well.

=2D-=20
  Thiago Macieira  -  thiago (AT) macieira (DOT) info
    PGP/GPG: 0x6EF45358; fingerprint:
    E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358

4. And =E6fter se scieppend ingelogode, he wr=E1t "cenn", ac eala! se=20
rihtendgesamnung andswarode "cenn: ne w=E1t h=FA cennan 'eall'. =C1stynt."

--nextPart3235853.QYKLaSbnbR
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.0 (GNU/Linux)

iD8DBQBCa+JeM/XwBW70U1gRAhNbAJ9xw/JVVfEAsiJ5iw+Wf9mrUKTmNQCgm5iT
zjYyHyyhubVkkCvQi8SKzHM=
=rUZ0
-----END PGP SIGNATURE-----

--nextPart3235853.QYKLaSbnbR--