On Mon, Aug 03, 2020 at 05:01:18PM +0200, Florian Weimer wrote:
* Daniel P. Berrangé:
> Disabling LTO in the RPM spec confirms this and makes things pass
> again. Hacking the makefiles to remove the -fno-lto option when
> building the test suite binaries also fixes things.
>
> I don't see any mention of LD_PRELOAD being impacted by LTO in the
> Fedora feature change page, but I can imagine how it would be.
LTO should still export the same functions as before, and should not
imply -fno-semantic-interposition by default. The linker plugin
provides the necessary information to GCC. What you are observing could
be the result of a toolchain bug.
Yeah (unless it is Clang which only supports -fno-semantic-interposition and
not anything else. LD_PRELOAD will simply not work with it).
Jakub