[lttng-dev] [PATCH] Fix linker library order

[Alexandre Montplaisir]

On 13-05-14 01:38 PM, Simon Marchi wrote:
> [...]
>
> If you read carefully the log sent by Alexandre, you see that it is
> when building the shared libs in this directory
> (lttng-ust-provider-ust-tests-demo.so) that the build fails. I don't
> know why it fails, but Alexandre hinted that passing "-fPIE -pie" to
> build a shared library is weird (it is usually -fPIC -pic). I am not
> sure where that comes from. This behaviour only happens when building
> the package, not when building manually.

We build the daily packages with all Debian security options (this is
kind of a future-proofing to find problems like this one, I don't think
the "real" Debian packages use it).

See
http://wiki.debian.org/Hardening#DEB_BUILD_HARDENING_PIE_.28gcc.2Fg.2B-.2B-_-fPIE_-pie.29

So far it handled the autotools-powered Makefiles correctly (libraries
are built with -fPIC, binaries with -fPIE), but it seems to cause
problems with hand-written Makefiles like the one in doc/examples/demo.

We could fix it with a package-specific patch, either by using autotools
to build this directory, or maybe not building it at all, since it's
just an example that we don't install...


Thanks all,
Alex