Date: Fri, 20 May 2016 20:10:32 +1000 From: Michael Ellerman <mpe@...erman.id.au> To: pageexec@...email.hu, Emese Revfy <re.emese@...il.com>, kernel-hardening@...ts.openwall.com Cc: Andrew Donnellan <andrew.donnellan@....ibm.com>, linux-kbuild@...r.kernel.org, spender@...ecurity.net, mmarek@...e.com, keescook@...omium.org, linux@...musvillemoes.dk, fengguang.wu@...el.com, dvyukov@...gle.com, linux-kernel@...r.kernel.org, david.brown@...aro.org, yamada.masahiro@...ionext.com, linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, Daniel Axtens <dja@...ens.net> Subject: Re: [PATCH v8 2/4] GCC plugin infrastructure On Thu, 2016-05-19 at 10:24 +0200, PaX Team wrote: > On 19 May 2016 at 16:22, Michael Ellerman wrote: > > On Wed, 2016-05-18 at 12:33 +0200, Emese Revfy wrote: > > > Did you test the plugins with all gcc versions (4.5-6)? > > > > What's the concern about gcc versions? Just not breaking the build on old > > compilers? > > the earlier plugin capable gcc versions used to install gcc headers in a somewhat > ad-hoc manner resulting in compile time breakage for plugins and since some of > those potentially missing headers are target specific, each target arch should > be verified before enabling plugin support on them. things have much improved with > gcc 5 (see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61176) though there's still > an occasional missing header but with wider use of plugins they will hopefully be > discovered earlier now. OK thanks. > perhaps linux-arch should be cc'ed on the plugin infrastructure > so that arch maintainers are aware of this? linux-arch is still fairly high traffic, so it's no guarantee arch maintainers will see it, but it's probably worth a try. > > I'm pretty sure powerpc big endian still builds with gcc 4.4. > > > > However if Andrew's only tested on little endian, then that select should be > > guarded with an "if CPU_LITTLE_ENDIAN". And to build LE you need gcc >= 4.9. > > i guess that's part of the target tuple so in general arch maintainers should test > the target tuples used on their arch with all the supported gcc versions (speaking > of CC, not HOSTCC/HOSTCXX). Yeah. I think we'll probably enable it gradually as folks get time to test it. ie. ppc64le first, then ppc64 (BE), and then 32-bit if someone is interested. cheers
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