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riscv: Disable STACKPROTECTOR_PER_TASK if GCC_PLUGIN_RANDSTRUCT is enabled

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riscv uses the value of TSK_STACK_CANARY to set
stack-protector-guard-offset. With GCC_PLUGIN_RANDSTRUCT enabled, that
value is non-deterministic, and with riscv:allmodconfig often results
in build errors such as

cc1: error: '8120' is not a valid offset in '-mstack-protector-guard-offset='

Enable STACKPROTECTOR_PER_TASK only if GCC_PLUGIN_RANDSTRUCT is disabled
to fix the problem.

Fixes: fea2fed201 ("riscv: Enable per-task stack canaries")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Guenter Roeck 2021-07-06 09:26:21 -07:00 committed by Palmer Dabbelt
parent d09560435c
commit a18b14d888
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arch/riscv/Kconfig
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@ -492,6 +492,7 @@ config CC_HAVE_STACKPROTECTOR_TLS
config STACKPROTECTOR_PER_TASK
def_bool y
depends on !GCC_PLUGIN_RANDSTRUCT
depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_TLS
config PHYS_RAM_BASE