[Scons-dev] Versioned libraries: non-standard sonames

[Gary Oberbrunner]

Hi David; the variable in question is SHLIBVERSION I think.  Are you
suggesting changing the logic in Tool/__init__.py where it splits that into
major, age, revision and uses major in the soname (-Wl,-soname=%s) so that
a different version number can be used in the soname, different from the
major version in SHLIBVERSION?  That seems like a reasonable type of
flexibility, though it could be confusing if misused of course (as you
point out).


On Wed, Jan 1, 2014 at 11:32 AM, David García Garzón
<david.garcia at upf.edu>wrote:


>

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> El 01/01/14 00:30, William Deegan ha escrit:

> > David,

> >

> >

> > On Dec 31, 2013, at 10:12 AM, David García Garzón

> <david.garcia at upf.edu> wrote:

> >

> >> I've been trying out the versioned libraries feature. As I said i do

> >> like the nice interface you guys finally got. But i would like to

> >> comment two issues i found. I open this thread about the first one:

> >> Non-standard Sonames

> >>

> >> Current implementation forces you to set the major version number as the

> >> soname suffix for your library. This is convenient in many cases, but

> >> this doesn't cover the undesiderable but real cases in which the soname

> >> must be changed more than once between major versions.

> >

> >

> >>

> >> Indeed in our project we left the first version for API changes, and the

> >> second version for ABI changes and the last one for ABI safe changes. So

> >> our soname has two version numbers and i think we are not a rare case.

> >> Indeed some projects have unrelated sonames and library names, that is

> >> far from ideal but real. So in general, i see convenient to be able to

> >> explicitly set the soversion for the library.

> >>

> >> The solution i am thinkin on, in pseudo-python, would be:

> >>

> >> soname = (

> >>  $SONAME if $SONAME else

> >>  libname+$SOVERSION if $SOVERSION else

> >>  libname+majorversion($SHLIBVERSION) if $SHLIBVERSION

> >> )

> >>

> >> So, how do you feel about this feature? I feel bold to implement it

> >> myself, so give me a bless and i'll go for it.

> >

> > So what would a linker command line look like for your use model?

> > -Bill

>

> Structurally the command line does not change. At some point we add the

> "-Wl,-soname=%s" flag in gcc tool chain specifying the soname and then

> we create the symlink with the same name specified at the flag. I am

> just arguing about how to compute such soname.

>

> My suggestion would be adding the following flag instead:

>

>     -Wl,-soname="$SONAME"

>

> And then defining SONAME by default as something like:

>

>     env["SONAME"]="$SHLIBPREFIX$TARGET$SHLIBSUFFIX.$ABIVERSION"

>

> env["ABIVERSION"]="${'.'.join(SHLIBVERSION.split('.')[:ABIVERSIONLEVELS])}"

>     env["ABIVERSIONLEVELS"]=1

>

> I just renamed previous SOVERSION as ABIVERSION because SONAME is

> posix/linux centric and ABI compatibility version is a crossplatform

> concept. I am opening a different discussion thread on this because i

> think we are using it badly in Darwin and not using it at all in windows

> platforms (cygwin, msvc and mingw).

>

> David.

>

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-- 
Gary
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