On 28/04/15 12:22, Emil Velikov wrote:
On 28 April 2015 at 11:16, Jose Fonseca <jfons...@vmware.com> wrote:
Hi,
I don't know if in the end of this thread there was an agreement that Valve
should only use bundled libstdc++ if it's newer than the system's libstdc++,
or just no agreement at all.
It seems to me that there is no agreement atm :-(
But just for future reference (or in case any distro decides to apply the
patches themselves), I'd like to point out there a couple of technical
issues with the proposed patch.
I actually modified apitrace's LD_PRELOAD wrappers precisely as Vivek
proposed (so apitrace can safely trace any application, without fear of
symbol collision, no matter what), but ran against two problems:
- For a long time static libstdcxx wasn't built with -fPIC ( see
https://urldefense.proofpoint.com/v2/url?u=https-3A__gcc.gnu.org_bugzilla_show-5Fbug.cgi-3Fid-3D28811&d=AwIBaQ&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=zfmBZnnVGHeYde45pMKNnVyzeaZbdIqVLprmZCM2zzE&m=Okz0-DpEUB5ncMYMjMjc59cE6euZOdfhCHx8NraKzQo&s=jE3xtJAeYngM4cK2Belo2vS4-0MAziIXXEbvY_1go9c&e=
) so I actually had to
add a configure-time check to see whether it works or not:
https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_apitrace_apitrace_commit_09531388e2aea19018ef03487d37a12547eb9325&d=AwIBaQ&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=zfmBZnnVGHeYde45pMKNnVyzeaZbdIqVLprmZCM2zzE&m=Okz0-DpEUB5ncMYMjMjc59cE6euZOdfhCHx8NraKzQo&s=HcmNQY-aIcw6rVHsn7Gz3g5sBNjepxRboc-MbusLe8A&e=
Good catch. I would assume that as we mandate GCC 4.2 we should be
save, although the configure check won't hurt either.
IIUC, from that bug report it looks like -fPIC on x86_64 was busted all
the way till GCC 4.7.1.
Jose
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