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C COMPILER->Compiler Command Line Options->Default to Reentrant Code (/Os)
The /Os option instructs the compiler to generate reentrant code by default. Therefore unless a function name is preceded by the _nonreentrant keyword, it will be compiled as a reentrant function.
If the /Os option is not used the compiler will generate non-reentrant code by default. Then, unless a function name is preceded by the _reentrant keyword, it will be compiled as a non-reentrant function.