backwards compatibility - QNX runtime error: unknown symbol __stack_chk_guard -

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i'm trying test backward compatibility between qnx 6.6.0 , 6.5.0 (in concequence of earlier question i've got). compiled relatively simple program using sdp6.6.0 , executed on neutrino 6.5.0. when execute program follow runtime error pops up:

unknown symbol: __stack_chk_guard

ldd:fatal: not resolve symbols

what causing this?..

(i've found solution wasn't working rightaway. when started writing question realized error made. future reference provide solution here q&a myself).

since qnx using gcc (qcc):

"buffer overflow detection enabled in current , newer gcc builds in (rare , complex) cases may result in run time complications such undefined symbol: __stack_chk_guard errors. in such cases possible solution disable feature adding -fno-stack-protector cflag list used gcc compilation options" (see [1] , what use of -fno-stack-protector?).

additionally: found forum thread ryan mansfield (qnx compiler lead maintainer, think) says:

one problem [one] might hit trying 6.6.0 binaries run on 6.5.0, built -fstack-protector, relies on support in libc. wasn't in 6.5.0 libc iirc, 6.5.0sp1 added.

thus, in qnx 6.5.0sp1 issue seems fixed.


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