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Subject: bug#13920: link_all_deps and indirect dependencies
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Hello,

in my project, I have program A that dynamically links with library B 
(library B is mentioned as DT_NEEDED in program A), and library B 
dynamically links with library C (library C is mentioned as DT_NEEDED in 
library B, and under dependency_libs in libraryB.la).

--> If I want to use a function from library C in program A, am I 
supposed to list (in Makefile.am) that program A depends on library C, 
or can I rely on the fact, that program A loads library B and library B 
loads library C, thus it is not necessary to link explicitly program A 
with library C?

Under Debian, libtool is patched to have link_all_deplibs=no, on other 
systems link_all_deplibs is unknown/yes.  When link_all_deplibs is yes, 
I do not have to link program A explicitly with library C; when 
link_all_deplibs is no, I have to link explicitly.

Program A, library B and library C are in the control of the same 
person, so the dependency on libC in libB is ensured.

According to the Debian maintainer of the libtool package, 
bugs.debian.org/cgi-bin/bugreport.cgi?bug=702737 , libtool's 
documentation shall state (or states, but I don't find where), that 
program A must explicitly link with library C.

Thanks in advance for your feedback
   Дилян

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 <dilyan.palauzov@HIDDEN>
Subject: bug#13920: Acknowledgement (link_all_deps and indirect dependencies)
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Date: Sun, 10 Mar 2013 22:12:01 +0000

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--=20
13920: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D13920
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Subject: bug#13920: link_all_deps and indirect dependencies
Resent-From: "Gary V. Vaughan" <gary@HIDDEN>
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On 11 Mar 2013, at 05:10, =D0=94=D0=B8=D0=BB=D1=8F=D0=BD =
=D0=9F=D0=B0=D0=BB=D0=B0=D1=83=D0=B7=D0=BE=D0=B2 =
<dilyan.palauzov@HIDDEN> wrote:
> Hello,

Hi,

> in my project, I have program A that dynamically links with library B =
(library B is mentioned as DT_NEEDED in program A), and library B =
dynamically links with library C (library C is mentioned as DT_NEEDED in =
library B, and under dependency_libs in libraryB.la).
>=20
> --> If I want to use a function from library C in program A, am I =
supposed to list (in Makefile.am) that program A depends on library C, =
or can I rely on the fact, that program A loads library B and library B =
loads library C, thus it is not necessary to link explicitly program A =
with library C?

Best practice dictates that you should list all of the libraries whose =
APIs you use.  So if you use an API from C in A, then A has an explicit =
dependency on C.

Libtool doesn't enforce this though, so if you prefer to be sloppy about =
dependencies it will still link correctly.


> Under Debian, libtool is patched to have link_all_deplibs=3Dno, on =
other systems link_all_deplibs is unknown/yes.  When link_all_deplibs is =
yes, I do not have to link program A explicitly with library C; when =
link_all_deplibs is no, I have to link explicitly.

Debian have broken one of the core features of libtool with that patch.  =
If you prefer to use the debian libtool, then you will need to list all =
your deplibs explicitly, since they have turned off the feature that =
tracks them for you. Alternatively, you can install a fully working =
libtool from gnu.org.

Debian and GNU disagree about the benefits of link_all_deplibs, and we =
have agreed to disagree.  There's no need to dig up the old arguments =
about the relative benefits of either approach, where both sides are =
already happy to co-exist peacefully :)

> Program A, library B and library C are in the control of the same =
person, so the dependency on libC in libB is ensured.
>=20
> According to the Debian maintainer of the libtool package, =
bugs.debian.org/cgi-bin/bugreport.cgi?bug=3D702737 , libtool's =
documentation shall state (or states, but I don't find where), that =
program A must explicitly link with library C.

Agreed.

Cheers,
--=20
Gary V. Vaughan (gary AT gnu DOT org)

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Subject: bug#13920: documentning link_all_deplibs on Debian
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 Content preview:  Hello, In regards of libtool bug #13920 and debian bug #702737
    I kindly ask you to update the documentation of libtool in aspect of link_all_deplibs,
    with something like the text below. I consider this as essential, as it would
    have saved me quite some (from my free) time investigating why the linking
    on Debian works differently/not according to the documentation. A proper
   documentation of link_all_deplibs on different systems, will safe the time
    of other developers investigating the same issue. [...] 
 
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Hello,

In regards of libtool bug #13920 and debian bug #702737 I kindly ask you 
to update the documentation of libtool in aspect of link_all_deplibs, 
with something like the text below.  I consider this as essential, as it 
would have saved me quite some (from my free) time investigating why the 
linking on Debian works differently/not according to the documentation. 
  A proper documentation of link_all_deplibs on different systems, will 
safe the time of other developers investigating the same issue.

diff --git a/doc/libtool.texi b/doc/libtool.texi
index c06ddaa..ec0d926 100644
--- a/doc/libtool.texi
+++ b/doc/libtool.texi
@@ -6938,6 +6938,9 @@ the file name that the linker finds when given 
@option{-l@var{name}}.
  Whether libtool must link a program against all its dependency libraries.
  Set to @samp{yes} or @samp{no}.  Default is @samp{unknown}, which is
  a synonym for @samp{yes}.
+
+On Debian and Ubuntu systems the default is @samp{no}.  As a side effect,
+transitive dependencies which rely on @samp{yes} will break.
  @end defvar

  @defvar link_static_flag

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