A.2.146 -xmaxopt[=v]

This command limits the level of pragma opt to the level specified. v is one of off, 1, 2, 3, 4, 5. The default value is -xmaxopt=off which causes pragma opt to be ignored. If you specify -xmaxopt without supplying an argument, that is the equivalent of specifying -xmaxopt=5.

If you specify both -xO and -xmaxopt, the optimization level set with -xO must not exceed the -xmaxopt value.