[openssl-users] build.info

[Thomás Inskip]

Thanks.  That is correct.  I'd like to specify -lsomellib for just one
engine target in engines/build.info.


On Tue, Sep 4, 2018 at 12:12 AM Jakob Bohm <jb-openssl at wisemo.com> wrote:

> On 04/09/2018 08:55, Wouter Verhelst wrote:
> > On 9/3/18 9:05 PM, Thomás Inskip wrote:
> >> Does anyone know how I can specify that a specific shared library (in
> >> this case an engine) is dependent on a system-installed shared
> >> library (i.e. not built along with openssl)?.  Basically the
> >> equivalent of LDFLAGS += -lsomelib
> > The GNU runtime dynamic library will honor DT_NEEDED flags of
> > libraries, too. That is,  you can just do LDFLAGS += -lsomelib on a
> > library target and it will work. Check libgtk-3.so, for instance:
> >
> > objdump -x /usr/lib/x86_64-linux-gnu/libgtk-3.so
> >
> > will show a bunch of lines like...
> >
> > Dynamic Section:
> >   NEEDED               libgdk-3.so.0
> >   NEEDED               libgmodule-2.0.so.0
> >   NEEDED               libpangocairo-1.0.so.0
> >   NEEDED               libX11.so.6
> >   NEEDED               libXi.so.6
> >   NEEDED               libXcomposite.so.1
> >   NEEDED               libXdamage.so.1
> > (...)
> >
> > Meaning, all these libraries need to be loaded for libgtk-3.so to work.
> >
> > Beware gotchas:
> >
> > - Not all rtdl implementations do so, so if you're not using a GNU
> > platform (e.g., Linux), then check the documentation of your runtime
> > dynamic linker.
> > - This works for shared libraries, but not for static ones.
> >
> > Regards,
> >
> Please note that the OP is apparently asking how to specify
> -lsomelib using the OpenSSL-specific build system, not the
> general meaning of using shared libraries on POSIX systems.
>
> Enjoy
>
> Jakob
> --
> Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
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