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SSP support requires support in ATF platform code. Not all platforms implement plat_get_stack_protector_canary() hook. The result is build failure: (.text.asm.update_stack_protector_canary+0x4): undefined reference to `plat_get_stack_protector_canary' Commitcf176128ec("boot/arm-trusted-firmware: add SSP option") originally introduces this issue. But then commitccac9a5bbb("boot/arm-trusted-firmware: don't force ENABLE_STACK_PROTECTOR") hid the problem by effectively disabling SSP for all platforms. So only after commit09acc7cbc9("boot/arm-trusted-firmware: fix SSP support") the issue showed up. Make SSP an opt-in for platform that actually provide the plat_get_stack_protector_canary() hook. Cc: Sergey Matyukevich <geomatsi@gmail.com> Cc: Dick Olsson <hi@senzilla.io> Tested-by: Heiko Thiery <heiko.thiery@gmail.com> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>