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Use -O0 to disable them and use -S to output assembly. -O3 is the highest level of optimization. Starting with gcc 4.8 the optimization level -Og is available. It enables optimizations that do not interfere with debugging and is the recommended default for the standard edit-compile-debug cycle.
The optimize pragma must appear outside a function. It takes effect at the first function defined after the pragma is seen. The on and off arguments turn options specified in the optimization-list on or off. The optimization-list can be zero or more of the parameters shown in the following table.
Consider the following piece of code:
unsigned global; while(global); global is modified in a function which is invoked by an IRQ. However, g++ removes the "is-not-zero" test and translates the while loop into an endless loop.
Disabling the compiler optimization solves the problem, but does C++ offer a language construct for it?
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