PR25882, .gnu.attributes are not checked for shared libraries

[H.J. Lu]

On Fri, May 1, 2020 at 4:22 PM Joseph Myers <joseph@codesourcery.com> wrote:
>
> This binutils patch breaks glibc "make check" for big-endian powerpc
> (32-bit and 64-bit).
>
> https://sourceware.org/pipermail/libc-testresults/2020q2/006097.html
>
> Errors of the form:
>
> /scratch/jmyers/glibc-bot/install/compilers/powerpc64-linux-gnu/lib/gcc/powerpc64-glibc-linux-gnu/11.0.0/../../../../powerpc64-glibc-linux-gnu/bin/ld: /scratch/jmyers/glibc-bot/build/glibcs/powerpc64-linux-gnu/glibc/math/test-nldbl-redirect.o uses 64-bit long double, /scratch/jmyers/glibc-bot/build/glibcs/powerpc64-linux-gnu/glibc/math/libm.so.6 uses 128-bit long double
>
> I don't know whether this is a problem with binutils, or it indicates that
> BE powerpc glibc needs to use -mno-gnu-attribute on some files like LE
> does to avoid such errors.

It is odd to check .gnu.attributes on shared libraries since shared libraries
used at link-time can be very different from run-time.  Checking .gnu.attributes
on shared libraries gives you very little.  For PT_GNU_PROPERTY,
.note.gnu.property section is ignored on shared libraries and shared library
check is done at run-time.

-- 
H.J.