Is there a way to check what flags are set on the compiler in running C++ code?
Specifically, was this code compiled with /fp:precise or /fp:fast from within the program?
Check what compiler flag is set within C++ code
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1 Answers
In the msvc documentation you can do this using predefined macros: https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=msvc-160
_M_FP_FAST Defined as 1 if the /fp:fast compiler option is set. Otherwise, undefined.
_M_FP_PRECISE Defined as 1 if the /fp:precise compiler option is set. Otherwise, undefined.
Note that these are compiler specific so don't expect them to work on any other compiler.
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