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gcc -- stop optimizing!
sirSolarius
Registered User regular
Registered User regular
I have some code that I want to run on a microcontroller. One piece of the code basically says:
var = 0;
var = 1;
var = 0;
but it is important that these instructions get executed, because var maps to a signal getting sent to the real world, and var needs to stay high for a clock cycle and then go low again.
I'm scared that gcc will optimize this out when it comes time to compile the final version. Is there a keyword to prevent my statements from being touched?
var = 0;
var = 1;
var = 0;
but it is important that these instructions get executed, because var maps to a signal getting sent to the real world, and var needs to stay high for a clock cycle and then go low again.
I'm scared that gcc will optimize this out when it comes time to compile the final version. Is there a keyword to prevent my statements from being touched?
sirSolarius on
0
Posts
volatile int var;
Not sure how to do it just for a file.
might also do the trick. lower number = less optimizing, might be just a CPU thing tho.
I've never tested this but K&R says it should work.
This is the way to go.
-O0 (no optimizations) is the default, there's no need to set an option for it.