package/kexec: fix link error when BR2_OPTIMIZE_0=y
When BR2_OPTIMIZE_0, -O0 is passed in compiler CFLAGS. This means no
code optimization will be performed.
kexec code uses a trick to detect unaligned accesses at link time
which needs at least dead-code-removal to work. See
put/get_unaligned() macros in kexec/kexec.h. This code was re-enabled
in upstream commit [1].
This commit sets at least -O1 (which include the sufficient
dead-code-removal) when BR2_OPTIMIZE_0=y, to fix those issues.
Fixes:
- http://autobuild.buildroot.org/results/8f8/8f8532f1dfbd71e52c51c00118934af9fa45e7cb
- http://autobuild.buildroot.org/results/528/528fd7baf9b0ad5549d22ec8e0623c5fa1f2d117
- http://autobuild.buildroot.org/results/499/499115439680adfb4b40042468e5bbb65d91ce6c
- ...and many others
[1] https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git/commit/?id=0723defb5308ac7fce296f8b596bff4df6803f01
Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit a411588b58)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
8e63d76db9