PING^N: [PATCH] Add --enable-static-pie to build static PIE [BZ #19574]

[H.J. Lu]

On Mon, Dec 18, 2017 at 5:37 AM, Joseph Myers <joseph@codesourcery.com> wrote:
> On Sat, 16 Dec 2017, H.J. Lu wrote:
>
>> Thanks for your time.  I checked it in with the updated commit log.
>> I also updated
>>
>> https://sourceware.org/glibc/wiki/PortStatus
>
> That's missing key information:
>
> * It needs a complete list of architectures that have not yet been
> verified to work with static PIE.  Architectures would then be removed
> from that list one at a time as and when someone verifies them to work and
> commits any fixes needed (and if the list becomes empty, the whole
> section of the wiki page could be removed at that point).

Done.

> * It needs instructions on how to test whether static PIE works for an
> architecture (or architecture/ABI pair, if appropriate).  Is this
> "configure --enable-static-pie and make sure test results are as good as
> without that option", or "configure --enable-static-pie and make sure
> tests X, Y and Z pass", or doing one of those but additionally using GCC 8
> or later so -static-pie is supported, or something else?  This needs to be
> on the wiki page so it's completely clear how someone can test the feature
> for an architecture and have confidence in whether it's working.

Only need to add  --enable-static-pie to glibc configure to enable static
PIE, which is in INSTALL.  The test results should be identical with or
without  --enable-static-pie.

> When new ports are submitted for glibc, you should then seek confirmation
> of whether they work with static-PIE, as if they don't and get added to
> glibc without such support, they'd need to be added to the list on the
> wiki page.
>
>> for static PIE status.  Should build-many-glibcs.py be updated to also
>> build static PIE for i386, x86_64 and x32?  We can't build it by default
>> since the recent linker is needed.
>
> A few additional builds for configurations where all the GCC / binutils /
> glibc support required is present would be a good idea (but maybe not if
> enough support isn't present in the default versions used by
> build-many-glibcs.py, which means GCC 7 branch and binutils 2.29 branch).

GCC 7 branch and binutils 2.29 branch support static PIE on x86.   The patch
is at:

https://sourceware.org/ml/libc-alpha/2017-12/msg00614.html


-- 
H.J.