For the record, this is what's causing the config differences between
the gcc versions:
With gcc 10.3.0, CC_HAS_KASAN_GENERIC is not available as it depends on
the following compiler flag:
config CC_HAS_KASAN_GENERIC
def_bool $(cc-option, -fsanitize=kernel-address)
'cc-option' will do something similar to the following, which with gcc
10.2.0 riscv64 cross compiler would return success:
$ /usr/bin/riscv64-linux-gnu-gcc-10 -Werror -fsanitize=kernel-address -c -x c
/dev/null
$ echo $?
0
But with 10.3.0 this doesn't seem to be supported anymore as a
standalone flag, depending now on '-fasan-shadow-offset=':
$ /usr/bin/riscv64-linux-gnu-gcc-10 -Werror -fsanitize=kernel-address -c -x c
/dev/null
cc1: error: ‘-fsanitize=kernel-address’ with stack protection is not supported
without ‘-fasan-shadow-offset=’ for this target [-Werror]
And all KASAN options get removed altogether.
This doesn't cause any real config change, as we disable CONFIG_KASAN
anyway. But for our annotations '-' != 'n', failing the config checks.
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https://bugs.launchpad.net/bugs/1933856
Title:
gcc version used for kernel configs doesn't match the one used for
builds
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