docs/coding_style: Clarify use of GCC extensions

This patch adds a section to the coding style that explicitly clarifies
the use of GCC extensions in coreboot (which has been long-standing
practice anyway), and expressly allows their use.

See the mailing list discussion for more details:
https://mail.coreboot.org/hyperkitty/list/coreboot@coreboot.org/thread/3C2QWAZ5RJ6ME5KXMEOGB5GW62UTXCLS/

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I0d0eb90d6729fefeb131cdd573ad51f1884afe11
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63660
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>

0 files changed, 0 insertions, 0 deletions