This option enables you to restrict the optimizations performed by the compiler.
one of the following:
prevents the removal of unused functions
prevents the removal of unused inline functions
prevents the removal of unused non-inline functions
prevents path-removing optimizations, such as
a|b. This supports Modified Condition Decision Coverage (MCDC) testing.
prevents calls being removed, for example by inlining or tailcalling.
prevents calls being merged, for example by cross-jumping (that is, common tail path merging).
prevents calls to library functions being removed, for example by inline expansion.
prevents data being removed.
prevents read-only data being removed.
prevents read-write data being removed.
prevents data being reordered.
unspecified, the compiler faults use of