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Improve -fno-strict-overflow description #693

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Improve -fno-strict-overflow description and document changes in GCC 8.5.

Add -ftrapv and -fsanitize=signed-integer-overflow as alternative options

Fixes #685

Add -ftrapv as alternative option

Signed-off-by: Thomas Nyman <[email protected]>
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Closing as dublicate

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Consider -ftrapv for C and C++ Compiler Hardening Guide
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