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Error compiling with modern gcc #1

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@make-all

Due to improvements in preventing unsafe memory access in gcc 8, the following code now gives a warning, which due to the compile options used is translated to an error and halts compilation.

memset(&sig, 0, sizeof(ECCSignature));

build/linux/arm/debug/dist/cpp/inc/qcc/KeyInfoECC.h:140:45: error: 'void* memset(void*, int, size_t)' clearing an object of type 'struct qcc::ECCSignature' with no trivial copy-assignment; use assignment or value-initialization instead [-Werror=class-memaccess]

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