[Buildroot] Analysis of build results for 2016-02-21

[Olivier Schonken]

Hi Thomas, all

I looked through the other classes of cups-2.1.2 build failures visible
at http://autobuild.buildroot.org/?reason=cups-2.1.2.

Basically 3 errors.  The 2 errors we have already discussed, and a 3rd
caused by linking with gnutls when building static libraries.
Fails at link stage with undefined references.

Regards

Olivier

On 23 February 2016 at 10:11, Thomas Petazzoni <
thomas.petazzoni at free-electrons.com> wrote:

> Hello,
>
> On Tue, 23 Feb 2016 09:34:31 +0200, Olivier Schonken wrote:
>
> > The suggestion from Romain to disable -fPIE as below works for both
> > architectures.  Can I submit a patch for this? Or do you want to wait
> for a
> > response from Alexey and Waldemar?
> >
> > # Remove -fPIE -pie from CFLAGS
> > ifeq ($(BR2_STATIC_LIBS),y)
> > CUPS_CONF_OPTS += LSB_BUILD=y
> > endif
>
> Unfortunately, I don't like this, for several reasons:
>
>  1/ LSB_BUILD=y will also disable stack protection support.
>
>  2/ Only uClibc in static library build is affected by the problem, not
>     musl for example.
>
>  3/ It is not fixing the real problem.
>
> The real fixes are:
>
>  1/ Use AC_CACHE_VAL() in the configure.ac script to be able to force
>     disable PIE, and then use that to disable it on ARC. Or
>     alternatively, change the configure.ac to use:
>
> ++AX_CHECK_COMPILE_FLAG([-fPIE -DPIE], [PIE_CFLAGS="-fPIE -DPIE"])
> ++AX_CHECK_LINK_FLAG([-pie], [PIE_LDFLAGS="$PIE_LDFLAGS -pie"])
>
>     Which also provide cache variables to override their results. See
>     http://patchwork.ozlabs.org/patch/569556/.
>
>  2/ Fix the uClibc static case by fixing the toolchain build process or
>     uClibc itself (depending on which one is broken).
>
> Of course, this requires effort than the quick hack of LSB_BUILD=y, but
> those are IMO the real fixes, while LSB_BUILD=y is papering over the
> real problem.
>
> Note that there are other classes of cups-2.1.2 build failures visible
> at http://autobuild.buildroot.org/?reason=cups-2.1.2.
>
> Best regards,
>
> Thomas
> --
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
>
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