[Buildroot] [PATCH 0/4] arch: not all have support in the internal backend

Yann E. MORIN yann.morin.1998 at free.fr
Sat Sep 2 19:38:43 UTC 2017

Hello All!

Not all architectures we support have support in upstream gcc, glibc,
binutils, and/or linux. In some cases, only a few specific cores do not
have that support.

Furthermore, some architecture, specific cores, or core behaviour/setup
(like the MIPS NaN support) got support in a specific gcc version.

Currently, we have to account for this in at least three locations:
  - the toolchain backend choice (internal or externsal)
  - the gcc version choice
  - each external toolchain

This series is a first step, to introduce the possibility for each
architecture, or specific core thereof, to specify that it lacks support
in our internal backend.

The logic is indeed a negative logic, which we usaual try to avoid in
Buildroot. However, the vast majority of architectures and individual
cores do have support with our internal backend; only a few of them
don't, and using positive logic would have meant that that vast majority
would have had to add a new 'select'.

The case for the gcc version will be handled in a follow-up series,
while the MIPS NaN fixes will ber in their own further follow-up.

Yann E. MORIN.

The following changes since commit e8bcc8ad93745ea9bdcd13c076fec1f3e27b9dee

  cgilua: bump to version 5.2.1 (2017-09-02 20:17:24 +0200)

are available in the git repository at:


for you to fetch changes up to 8cc068d0be7bb232bfbd3bb3c67dc01b476f3297

  arch/mips: internal backend not suitable for some cores (2017-09-02 21:34:30 +0200)

Yann E. MORIN (4):
      arch: add option to disable internal toolchain backend
      arch/csky: internal backend not suitable
      arch/bfin: internal backend not suitable for some cores
      arch/mips: internal backend not suitable for some cores

 arch/Config.in      | 7 +++++++
 arch/Config.in.bfin | 4 ++++
 arch/Config.in.mips | 2 ++
 toolchain/Config.in | 8 +-------
 4 files changed, 14 insertions(+), 7 deletions(-)

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