gcc 4.7 introduced the sync_8 builtin functions for ARM. For ARM < v7,
this requires calling into the kernel. However, the failure path of
that call reports an error with the __write() function, which is a
glibc internal function. Therefore, it fails to link with uClibc or
musl. This was fixed in gcc 5.2.0, by replacing the __write() with
a plain write().
For sync_8 itself we have solved this with the conditions on
BR2_TOOLCHAIN_ARM_HAS_SYNC_8. However, the same function is also used
for the implementation of atomics.
For the internal toolchain, we can fix this by backporting the patch
to 4.9.4 and 4.8.5.
Fixes:
http://autobuild.buildroot.net/results/1db64b4830f499621e44523e0ef68191505e2ce9
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Two patches are removed, as they have been upstreamed:
- 130-fix_build_with_gcc-6.patch (svn commit 233721, Git commit
8c3fa311caa86f61b4e28d1563d1110b44340fb2)
- 920-libgcc-remove-unistd-header.patch (svn commit 226092, Git commit
e940d7953f06af11d09229a29ecbcc1ba25b378d)
All other patches have simply been refreshed, with no manual edit
needed.
A build+runtime test has been done with an ARM, Cortex-A8, EABIhf, musl
configuration, booted under Qemu.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
